How to get full path from “../” on command line in Linux shell script

Question

如果我有一个shell脚本，我使用“../”获取父文件夹，我可以将它扩展到它的绝对路径吗？

Answer 1

You want readlink -f .

$ cd /tmp
$ readlink -f ..
/

Answer 2

Use realpath

$ realpath ..
/home

Answer 3

While you can often get the full path of a directory using stat , you can also use pwd -P ... however, it isn't much help unless you actually cd to the directory you are interested in.

To get around this limitation without actually changing the current working directory, I've found it fine to just run that cd in a sub-shell , as in:

THIS=`dirname $0`     # Which is often "."
PARENT=$(
  cd $THIS            # At this point, we are sure we're in script's directory
  dirname `pwd -P`
)
echo "PARENT=$PARENT"

Answer 4

When using in cmd line:

dirname $(pwd)

When using in shell script:

PROJ_DIR=$(dirname $(pwd))