Communities

Writing

Codidact Meta

The Great Outdoors

Photography & Video

Scientific Speculation

Cooking

Electrical Engineering

Judaism

Languages & Linguistics

$Mathematics$

tag:snake search within a tag

answers:0 unanswered questions

user:xxxx search by author id

score:0.5 posts with 0.5+ score

"snake oil" exact phrase

votes:4 posts with 4+ votes

created:<1w created < 1 week ago

post_type:xxxx type of post

Search help

Notifications

Mark all as read See all your notifications »

Q&A Code Reviews Meta

Q&A

Posts Tags Edits

Ask Question

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

How would I display the first line of all files matching a glob? [closed]

+1

−2

Closed as unclear by Alexei‭ on May 10, 2024 at 06:18

This question cannot be answered in its current form, because critical information is missing.

This question was closed; new answers can no longer be added. Users with the reopen privilege may vote to reopen this question if it has been improved or closed incorrectly.

My use case is a collection of CSV files, each with header row. What I want to know is what subset(s) of them are "union compatible", although I also want matching column names before stacking these tables.

bash

posted 6 months ago

CC BY-NC-SA 4.0

6mo ago by Alexei‭

lori‭

2 reputation 1 0 -1 0

Raw

Markdown

History

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

Please enter the URL of the proposed duplicate in the details field below.

not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

1 comment thread

What have you tried? (1 comment)

1 answer

Score Active Age

+2

−0

The first line of a file is head -1. But you probably also want the file name. So something like:

for file in glob
do
    first_line="$(head -1 "$file")"
    printf "%s: %s\n" "$file" "$first_line"
done

Where glob above is something like *.csv or whatever.

posted 6 months ago

CC BY-SA 4.0

aghast‭

152 reputation 3 6 17 2

Copy Link

Raw