Save output of cat, pipe, while loop to file

Asked Jul 08 '20 at 08:24

Active Jul 08 '20 at 08:24

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I want to search in some text for words from list saved as file: merged.failed. Then I want to redirect the output of this command to file

cat merged.failed | while read f; do grep -io $f /home/some/path/some.txt; done | sort > merged.failed

When I do so the merged.failed file becomes empty. However, wihotut > merged.failed the correct output prints

asked Jul 08 '20 at 08:24

superuser

also just `grep -f` and [how to read a file line by line in bash](https://mywiki.wooledge.org/BashFAQ/001) – KamilCuk Jul 08 '20 at 08:27
why just ```grep -f```? – superuser Jul 08 '20 at 08:39
Why not? `grep -iof merged.failed /home/some/path/some.txt` What for to use a while read loop? `grep` already does that. – KamilCuk Jul 08 '20 at 08:39

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