在linux的shell中⼀bin⼀true是什么意思?

2024-12-17 04:32:25
推荐回答(2个)
回答1:

true命令啥都不做,只设置退出码为0。
在Linux底下,每个程序执行完毕都会返回一个退出码给调用者,一般情况下0表示成功,其他值表明有问题,当然某些程序的退出码有特殊含义。有些shell下true可能是个内建命令,至少bash下是。(do nothing, successfully。Exit with a status code indicating success. NOTE: your shell may have its own version of true, which usually supersedes the version described here. Please refer to your shell’s documentation for details about the options it supports.)
相对应的命令是false,也是啥都不干,但退出码设置为1。

回答2:

true命令啥都不做,只设置退出码为0。
在Linux底下,每个程序执行完毕都会返回一个退出码给调用者,一般情况下0表示成功,其他值表明有问题,当然某些程序的退出码有特殊含义。有些shell下true可能是个内建命令,至少bash下是。(do nothing, successfully。Exit with a status code indicating success. NOTE: your shell may have its own version of true, which usually supersedes the version described here. Please refer to your shell’s documentation for details about the options it supports.)

相对应的命令是false,也是啥都不干,但退出码设置为1。
命令可以在这里学习