Software Development

#8: Post edited by

Dirk Herrmann‭ · 2023-06-13T08:33:36Z (over 1 year ago)
Small fix, confused foo and bar at one place

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From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
~~This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.~~
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'bar' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#7: Post edited by

Dirk Herrmann‭ · 2023-06-13T06:46:39Z (over 1 year ago)

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From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word. And, if several lines in a file fulfill the condition, all of them will be printed - which may or may not be what you expect.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#6: Post edited by

Dirk Herrmann‭ · 2023-06-13T06:46:04Z (over 1 year ago)

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From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
~~This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.~~
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word. And, if several lines in a file fulfill the condition, all of them will be printed - which may or may not be what you expect.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#5: Post edited by

Dirk Herrmann‭ · 2023-06-13T06:44:50Z (over 1 year ago)

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From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occurs more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occur more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#4: Post edited by

Dirk Herrmann‭ · 2023-06-13T06:44:28Z (over 1 year ago)

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From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
~~Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved, but only one would be printed.~~
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved (or even more if 'foo' or 'bar' occurs more often), but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#3: Post edited by

Dirk Herrmann‭ · 2023-06-13T06:43:04Z (over 1 year ago)
Improved find command, added discussion about finding foo and bar on the same line

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~~From your description~~
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
~~I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line.~~
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
~~find . -exec grep -q foo {} \; -exec grep -l bar {} \;~~
```
The first condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second condition (`-exec grep -l bar {} \;`) operates on the files for which the first condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.

From your description ...
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
... I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line. Thus I will discuss that aspect first.
**'foo' and 'bar' possibly on different lines:**
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -type f -exec grep -wq foo {} \; -exec grep -wl bar {} \;
```
The first `-exec` condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second `-exec` condition (`-exec grep -l bar {} \;`) operates on the files for which the first `-exec` condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.
Note that I left out the `-n` option here, as it does not seem to make sense in this case: There are possibly two lines involved, but only one would be printed.
**'foo' and 'bar' on the same line:**
The solution that you have written is able to find lines where 'foo' and 'bar' appear on the same line:
```sh
grep -rnw . -e 'foo' | grep -e 'bar'
```
The first `grep` searches for all lines with 'foo' and prints the lines that were found to `stdout` prefixed with the file name and the line number. This output is then piped to the second `grep`, which filters for those lines containing 'bar'.
This will (mostly) work for the case where you want to find files with 'foo' and 'bar' appearing on the same line. It will fail if one of the file names happens to contain 'foo' as a word.
An alternative approach to find lines where 'foo' and 'bar' are expected on the same line is the following, which checks for lines with 'foo' followed by 'bar' or lines with 'bar' followed by 'foo':
```sh
grep -rn -E -e '(\<foo\>.*\<bar\>)|(\<bar\>.*\<foo\>)' .
```

#2: Post edited by

Dirk Herrmann‭ · 2023-06-11T19:27:18Z (over 1 year ago)

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From your description
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
~~I conclude that you are interested in files that contain both `foo` and `bar`, but not necessarily on the same line.~~
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -exec grep -q foo {} \; -exec grep -l bar {} \;
```
The first condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing "foo": The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second condition (`-exec grep -l bar {} \;`) operates on the files for which the first condition was true (i.e. which contained "foo"). This time grep searches for "bar", and due to the `-l` option prints the name of the file where a match was found.

From your description
> I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
I conclude that you are interested in files that contain both 'foo' and 'bar', but not necessarily on the same line.
As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -exec grep -q foo {} \; -exec grep -l bar {} \;
```
The first condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing 'foo': The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.
The second condition (`-exec grep -l bar {} \;`) operates on the files for which the first condition was true (i.e. which contained 'foo'). This time `grep` searches for 'bar', and due to the `-l` option prints the name of the file where a match was found.

#1: Initial revision by

Dirk Herrmann‭ · 2023-06-11T19:25:39Z (over 1 year ago)

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From your description

 > I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.

I conclude that you are interested in files that contain both `foo` and `bar`, but not necessarily on the same line.

As an alternative to the approach proposed by @Canina this can be solved by a combination of `find` and `grep` in the following way:
```sh
find . -exec grep -q foo {} \; -exec grep -l bar {} \;
```
The first condition of the `find` command (`-exec grep -q foo {} \;`) succeeds on files containing "foo": The `-q` option instructs `grep` to be quiet and only report whether a match was found in the return status.

The second condition (`-exec grep -l bar {} \;`) operates on the files for which the first condition was true (i.e. which contained "foo").  This time grep searches for "bar", and due to the `-l` option prints the name of the file where a match was found.

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