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Q&A How to prompt a user for an expanded variable in Bash?

How about this for bash: #!/bin/bash echo "What is your web application root?" read web_application_root web_application_root="$(envsubst <<< "$web_application_root")" echo web_...

posted 3y ago by Someone‭  ·  edited 3y ago by Someone‭

Answer
#2: Post edited by user avatar Someone‭ · 2021-03-15T23:29:47Z (over 3 years ago)
  • How about this for bash:
  • ```
  • #!/bin/bash
  • echo "What is your web application root?"
  • IFS= read web_application_root
  • web_application_root="$(envsubst <<< "$web_application_root")"
  • echo web_application_root=$web_application_root
  • ```
  • `IFS=` helps you deal with spaces. `envsubst` does the environment variable expansion for you. For example:
  • ```
  • $ ./test.sh
  • What is your web application root?
  • ${HOME}/a b
  • web_application_root=/home/Someone/a b
  • ```
  • How about this for bash:
  • ```
  • #!/bin/bash
  • echo "What is your web application root?"
  • read web_application_root
  • web_application_root="$(envsubst <<< "$web_application_root")"
  • echo web_application_root=$web_application_root
  • ```
  • `envsubst` does the environment variable expansion for you. For example:
  • ```
  • $ ./test.sh
  • What is your web application root?
  • ${HOME}/a b
  • web_application_root=/home/Someone/a b
  • ```
#1: Initial revision by user avatar Someone‭ · 2021-03-15T23:26:29Z (over 3 years ago)
How about this for bash:

```
#!/bin/bash

echo "What is your web application root?"
IFS= read web_application_root

web_application_root="$(envsubst <<< "$web_application_root")"

echo web_application_root=$web_application_root
```

`IFS=` helps you deal with spaces. `envsubst` does the environment variable expansion for you. For example:

```
$ ./test.sh 
What is your web application root?
${HOME}/a b
web_application_root=/home/Someone/a b
```