How to detect the current directory in which I run my shell script?
我如何检测运行shell脚本的目录名称（或更好的整个路径）？
what shell? What operating system?
For starters try
man pwd
$PWD
我相信这是最便携的方式：
dir=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
This is not as trivial as it looks like. Check out this question and this
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