How to use sed to extract substring from a file

Asked Sep 01 '21 at 14:51

Active Sep 01 '21 at 15:06

Viewed 43 times

I have a file containing lines that look like:

./key_simple_5349431800000000000_test.txt
./key_simple_5347940900000000000_test.txt
./key_simple_5349431800000000001_test.txt
./key_simple_5347940900000000001_10-123_test.txt
./key_simple_5349431800000000002_10-123_test.txt
./key_simple_5347940900000000002_10-123_.txt
./key_simple_5349431800000000003_test.txt
./key_simple_5347940900000000003_test.txt

I want to execute command on this file to extract only the numbers between underscores to have an end result that looks like:

$sedcommand file.txt
5349431800000000000
5347940900000000000
5349431800000000001
5347940900000000001
5349431800000000002
5347940900000000002
5349431800000000003
5347940900000000003

What could this command be?

edited Sep 01 '21 at 14:52

Wiktor Stribiżew

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asked Sep 01 '21 at 14:51

Mike Garber

1

Use: `cut -d_ -f3 file` – anubhava Sep 01 '21 at 14:53
1

Also: `grep -Eo "_[0-9]+_" file` – Alireza Sep 01 '21 at 14:56

How to use sed to extract substring from a file

0 Answers0