awk find and delete line from list

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11-22-2017

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I'm glad it's working for you now.

Note that if you expect all lines in file.txt to be matched by a line in input.txt and you want file.txt to be an empty file in that case; change the command list to be:

Code:

grep -f input.txt -v file.txt > file; [ $? -le 1 ] && mv file file.txt

You need to do this because the exit code from grep is 1 if no input lines are copied to the output file, but no errors occurred. (This is why file wasn't moved to file.txt when file was empty.)

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