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shell_err.sh
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# https://zh-google-styleguide.readthedocs.io/en/latest/google-shell-styleguide/environment/ | |
err() { | |
echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2 | |
} | |
if ! do_something; then | |
err "Unable to do_something" | |
exit "${E_DID_NOTHING}" | |
fi | |
$$ Shell本身的PID(ProcessID) | |
$! Shell最后运行的后台Process的PID | |
$? 最后运行的命令的结束代码(返回值) | |
$- 使用Set命令设定的Flag一览 | |
$* 所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。 | |
$@ 所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。 | |
$# 添加到Shell的参数个数 | |
$0 Shell本身的文件名 | |
$1~$n 添加到Shell的各参数值。$1是第1参数、$2是第2参数…。 |
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