CDPATH：改变目录路径变量，保留一系列由冒号隔开的路径名，用于cd命令。如果设置了CDPATH，cd一个目录时，首先查找CDPATH，如果CDPATH指明此目录，则此目录成为当前工作目录。例子如下：
[[email protected] ~]$ pwd /home/staff/clu [[email protected] ~]$ cd hello -bash: cd: hello: No such file or directory [[email protected] ~]$ export CDPATH=/home/staff/clu/helloworld/ [[email protected] ~]$ cd hello /home/staff/clu/helloworld/hello [[email protected] hello]$ pwd /home/staff/clu/helloworld/hello [[email protected] hello]$