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Home/ Questions/Q 9144079
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Editorial Team
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Editorial Team
Asked: June 17, 20262026-06-17T10:10:53+00:00 2026-06-17T10:10:53+00:00

I have about 500 files with trailing NUL bytes, maybe produced with truncate -s

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I have about 500 files with trailing NUL bytes, maybe produced with

truncate -s 8M <file>

How can I cut off the zeroes?

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  1. Editorial Team
    Editorial Team
    2026-06-17T10:10:54+00:00Added an answer on June 17, 2026 at 10:10 am

    This perl script should do it:

    for f in *; do
        perl -e '$/=undef;$_=<>;s|\0+$||;print;' < $f > $f_fixed
    done
    

    This will keep all NULs within the file, remove any at the end, and save the result into <original filename>_fixed.

    Script explanation: $/=undef tells perl to operate on the whole file rather than splitting it into lines; $_=<> loads the file; s|\0+|| removes any string of NULs at the end of the loaded file ‘string’; and print outputs the result. The rest is standard Bash file redirection.

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