coreutils: Print usage to stderr. #7920
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Scripts exist that may call one of the multi-binary entry points with argument 0 set to some other value than the name of the entry point. One example is the Open vSwitch testsuite which makes use of /bin/true as an argument to the bash builtin `exec` to check whether it supports the '-a' argument [0]. In this situation coreutils will print usage on standard output, which makes unnecessary noise. Printing usage on standard error, which is customary for other tools, allows the script to succeed. 0: https://github.com/openvswitch/ovs/blob/28064e9fa50d/tests/ovs-macros.at#L199 Signed-off-by: Frode Nordahl <[email protected]>
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Scripts exist that may call one of the multi-binary entry points with argument 0 set to some other value than the name of the entry point.
One example is the Open vSwitch testsuite which makes use of /bin/true as an argument to the bash builtin
execto check whether it supports the '-a' argument [0].In this situation coreutils will print usage on standard output, which makes unnecessary noise.
Printing usage on standard error, which is customary for other tools, allows the script to succeed.
0: https://github.com/openvswitch/ovs/blob/28064e9fa50d/tests/ovs-macros.at#L199