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`command -v` portability

Merged `command -v` portability
eschwartz/xdg-utils:command-v-portability into master
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Merged Eli Schwartz requested to merge eschwartz/xdg-utils:command-v-portability into master
5 unresolved threads
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    The "which" utility is not guaranteed to be installed, and if it
is, its behavior is not portable.

Conversely, the "command -v" shell builtin is required to exist in all
POSIX 2008 compliant shells, and is thus guaranteed to work everywhere.

Examples of open-source shells likely to be installed as /bin/sh on
Linux, which implement the 12-year-old standard: ash, bash, busybox,
dash, ksh, mksh and zsh.

A side benefit of using the POSIX portable option is that it does not
require an external disk executable to be forked. This therefore
represents a mild speedup.