shell脚本用crontab执行和手动执行结果不一致

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PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin

这行就好了,

shell首部用  #!/usr/bin/env bash 这个移植性更好。

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different results between crontab and running script manually

Your script lacks a shebang, so it might run with different shells depending on a crontab or manual launch.

Add the following as first line in your script (replace bash with your current user shell if needed):

#!/usr/bin/env bash

Don't use /bin/bash as it's less portable than /usr/bin/env bash.

Also, crontab runs won't have the PATH variable. Print your path variable with:

echo $PATH

And add it as second line of your script like:

#!/usr/bin/env bash
PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin

This should ensure that your script runs in the same environment when run by crontab or manually.

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answered Sep 14 '16 at 8:51

Orsiris de Jong

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  Thanks for this! It works now, could you provide me with a link or expand on why /bin/bash is less portable than /usr/bin/env bash – carrots Sep 22 '16 at 0:51
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  /bin/bash is linux specific whereas /usr/bin/env is supposed to exist on all unix systems. See stackoverflow.com/questions/16365130/… for mre. – Orsiris de Jong Sep 23 '16 at 6:15