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I want to check the difference of two file list

one is ls | cut -c 1-4 another is ls | cut -c 1-4 | uniq

does there exists any way can let me do like this diff (ls | cut -c 1-4) (ls | cut -c 1-4 | uniq) or anyway can let me without saving the two list command into files then check the difference of it ..

thanks

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    Which shell? Some of them support process substitution: diff <(ls | cut -c 1-4) <(ls | cut -c 1-4 | uniq). Commented Aug 14, 2013 at 12:49
  • @manatwork c shell Commented Aug 14, 2013 at 12:53

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This should work (tested on Linux, from bash)

diff <(ls | cut -c 1-4) <(ls | cut -c 1-4 | uniq)

or in general, lets have two commands cmd1 and cmd2 which produces some output

diff <(cmd1) <(cmd2)
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  • That works with ksh93 (where process substitution originated), zsh and bash on systems that support /dev/fd/n (or for some shell versions, named pipes). Commented Aug 14, 2013 at 13:46

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