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Asked: 2026-05-14T02:58:30+00:00

How can I remove every odd line, using sed? remove keep remove keep remove

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How can I remove every odd line, using sed?

remove
keep
remove
keep
remove
...
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  1. Editorial Team

    GNU sed has a suitable addressing mode:

    sed -n '1~2!p' file

    which means, starting from line 1, and with step 2, print all other lines.

    Equivalently, you can drop the -n, and delete matching lines:

    sed '1~2d'

    It can also be done using awk:

    awk 'NR%2==0' file

    (Whenever line number is a multiple of 2, print the line)

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