> `command' 
> 
> if (command -v chmod > /dev/null 2>&1) ; then
>       chmod go-w /foobar
> else
>       echo 'your system is broken' 2>&1
>       exit 1
> fi
> 
> its a shell builtin mandated by posix.
> 
> version of busybox is 0.61-1

command is mandated.
command -v is optional.

Therefore the above snippet might echo
'your system is broken' on a POSIX-compliant
system.


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