Johannes Sixt <j6t@xxxxxxxx> writes:
> Am 16.10.2012 17:07, schrieb Michael J Gruber:
>> Some test want to use the time command (not the shell builtin) and test
>> for its availability at /usr/bin/time.
>>
>> Provide a lazy prereq TIME_COMMAND which tests for $TEST_COMMAND_PATH,
>> which can be set from config.mak. It defaults to /usr/bin/time.
>
> This avoids the builtin:
>
> command time $that_command
>
> It works for bash, ksh, zsh, and dash (where the latter doesn't have it
> as builtin).
"command time" works but I think that is because it is not a
built-in ;-)
Here is what I read in bash(1):
command [-pVv] command [arg ...] Run command with args
suppressing the normal shell function lookup. Only
builtin commands or commands found in the PATH are
executed.
Taken together with this from "COMMAND EXECUTION":
If the command name contains no slashes, the shell attempts
to locate it. If there exists a shell function by that name,
that function is invoked as described above in FUNCTIONS. If
the name does not match a function, the shell searches for it
in the list of shell builtins. If a match is found, that
builtin is invoked.
If the name is neither a shell function nor a builtin, and
contains no slashes, bash searches each element of the PATH
for a directory containing an executable file by that name.
I suspect "command printf 'a b c\n'" would not use $HOME/bin/printf
even when I have $HOME/bin early in my $PATH (nor /usr/bin/printf
for that matter).
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