`set -x` 有什么作用? [英] What does `set -x` do?

问题描述

我有一个包含以下行的 shell 脚本:

I have a shell script with the following line in it:

[ "$DEBUG" == 'true' ] && set -x

推荐答案

set -x 启用 shell 模式，其中所有执行的命令都打印到终端.在您的情况下，它显然用于调试，这是 set -x 的典型用例:在执行时打印每个命令可能会帮助您可视化脚本的控制流(如果脚本不起作用)正如预期的那样.

set -x enables a mode of the shell where all executed commands are printed to the terminal. In your case it's clearly used for debugging, which is a typical use case for set -x: printing every command as it is executed may help you to visualize the control flow of the script if it is not functioning as expected.

set +x 禁用它.

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