CodingGuidelines: do not use 'which' in shell scripts
During the code review of a recent patch, it was noted that shell scripts must not use 'which $cmd' to check the availability of the command $cmd. The output of the command is not machine parseable and its exit code is not reliable across platforms. It is better to use 'type' to accomplish this task. Signed-off-by: NTim Henigan <tim.henigan@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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