Linux 命令：ulimit

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$ ulimit -a
-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-v: address space (kbytes)          unlimited
-l: locked-in-memory size (kbytes)  unlimited
-u: processes                       2784
-n: file descriptors                256

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$ ulimit -t
unlimited

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$ ulimit -t 1

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// 计算 pi 小数点后 3000 位
$ echo "scale=3000; a(1)*4" | bc -l
zsh: done                echo "scale=3000; a(1)*4" |
zsh: cpu limit exceeded  bc -l