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POShell execution: time vs. /usr/bin/time
 

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    <p>What is going on when bash/zsh does the following: </p> <pre><code>~ » /usr/bin/time -l sleep 1 1.00 real 0.00 user 0.00 sys 516096 maximum resident set size 0 average shared memory size 0 average unshared data size 0 average unshared stack size 145 page reclaims 0 page faults 0 swaps 0 block input operations 0 block output operations 0 messages sent 0 messages received 0 signals received 0 voluntary context switches 2 involuntary context switches ------------------------------------------------------------ ~ » time -l sleep 1 zsh: command not found: -l -l sleep 1 0.00s user 0.00s system 52% cpu 0.001 total ------------------------------------------------------------ ~ » /usr/bin/time foo foo: No such file or directory 0.00 real 0.00 user 0.00 sys ------------------------------------------------------------ ~ » time foo zsh: command not found: foo foo 0.00s user 0.00s system 52% cpu 0.001 total </code></pre> <p>Why does it make a difference how I use time, and why is zsh trying to execute <code>-l</code>??</p> <p>Curiously, zsh says </p> <pre><code>~ » which time time: shell reserved word </code></pre> <p>While bash doesn't:</p> <pre><code>~ » bash bash-3.2$ which time /usr/bin/time bash-3.2$ time foo bash: foo: command not found real 0m0.006s user 0m0.000s sys 0m0.003s bash-3.2$ /usr/bin/time foo foo: No such file or directory 0.00 real 0.00 user 0.00 sys bash-3.2$ time -l sleep 1 bash: -l: command not found real 0m0.001s user 0m0.000s sys 0m0.001s bash-3.2$ /usr/bin/time -l sleep 1 1.00 real 0.00 user 0.00 sys 516096 maximum resident set size 0 average shared memory size 0 average unshared data size 0 average unshared stack size 144 page reclaims 0 page faults 0 swaps 0 block input operations 1 block output operations 0 messages sent 0 messages received 0 signals received 2 voluntary context switches 2 involuntary context switches </code></pre>
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