get-cmd-dir.sh

#!/bin/bash
# vim: set ft=sh fdm=manual ts=2 sw=2 sts=2 tw=85 et:

# =======================================================
# Description:     Get the real path in the bin directory
# Author           QuanQuan <millionfor@apache.org>
# Created Time     Tue, Jun 21, 2022 11:36
# Last Modified    Tue, Jun 21, 2022 11:36
# GistID           6a5b6d4f853afa607378fbec08e326b6
# GistURL          https://gist.github.com/millionfor/6a5b6d4f853afa607378fbec08e326b6
# =======================================================

set -eu

a=`which $1`
while [ -h $a ]
do

   b=`ls -ld $a|awk '{print $NF}'`
   c=`ls -ld $a|awk '{print $(NF-2)}'`
   [[ $b =~ ^/ ]] && a=$b  || a=`dirname $c`/$b
done
echo $a