How to obtain the shell script location executed by sh or source

How to obtain the shell script location where sh or source executes 1) supports execution from other directories, such as sourcexxx/yyy/test. sh1) supports sh and source execution. 2) supports spaces in the path. 3) supports zsh and bash #! /Bin/shif [& quot; $0 & quot; bash & quot ;... how to obtain the shell script location where sh or source executes 1) supports execution from other directories, such as source xxx/yyy/test. sh 1) supports sh and source execution. 2) supports spaces in the path. 3) supports zsh and bash #! /Bin/sh if ["$0" = "bash"]; then cd "$ (dirname" $ BASH_SOURCE ")" CUR_FILE = $ (pwd) /$ (basename "$ BASH_SOURCE") CUR_DIR = $ (dirname "$ CUR_FILE ") cd->/dev/nullelse echo "$0" | grep-q "$ PWD" if [$? -Eq 0]; then CUR_FILE = $0 else CUR_FILE = $(pwd)/$0 fi CUR_DIR = $ (dirname "$ CUR_FILE") fi echo $ CUR_DIR