[root@localhost kang]# vi yy
echo YY
[root@localhost kang]# chmod +x yy
[root@localhost kang]# ./yy
YY
[root@localhost kang]# pwd
/root/kang

目的修改PATH路徑，讓用戶在任何目錄下輸入yy都可執行
[root@localhost kang]# PATH="$PATH:/root/kang"
[root@localhost kang]# echo $PATH
/usr/local/java//bin:/usr/local/java//bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/root/kang

驗證：
[root@localhost /]# pwd
/
[root@localhost /]# yy
YY
 

Linux 之 PATH路徑簡單理解