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I have a file, which has one line which is less than 20 characters length.

I wanted to find the line number and remove that line alone from that file.

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Using grep:

grep -vn '.\{20,\}' infile
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sed approach:

sed -i '/^.\{1,19\}$/d' file
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Using awk:

awk 'length >= 20' file

or, for the complete "remove those lines from the file" scenario:

awk 'length >= 20' file >tmpfile && mv tmpfile file

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