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In a bash shell, i want a script or commands that will take all test.in files (i have test1.in, test2.in, test3.in, to testN.in) and pipe it to an executable testExecutable and output the results of each in a testN.out file.

So far, I know i can input all the files by doing find . test*.in < testExecutable

but I"m not sure how to do the output pipe to generate mytest1.out for test1.in and mytest2.out for test2.in and so on.

Thanks for help in advance.

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You need a loop:

for f in test*.in; do testExecutable <"$f" >"my${f%in}out"; done

The above is safe for all file names, even names containing white space.

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  • 1
    Thanks for replying, that was exactly what i wanted! Now i'm trying to diff the mytest1.out and test1.out's for all testN's, would it be something like this? I want to make diff1.txt, diff2.txt, etc... for f in test*.in; do diff "$f" "my${f%in}out" > "diff$${f%in}"; done`
    – raisinpon
    Oct 29, 2015 at 0:59
  • Yes, but replace "diff$${f%in}" (where the $$ will not work as you want) with "diff${f%in}txt" and the output files will be named diffmytest1.txt, etc.
    – John1024
    Oct 29, 2015 at 1:16

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