Charges the current working directory to dir (which is quoted).
If dir is relative (does not begin with a / ),
and the CDPATH environment variable is defined,
then cd will search each of the directories in CDPATH
for a sub-directory dir. Here, CDPATH is a string
of directory names, separted by colons; it should begin with . .
cd will try to hide symbolic links: If you cd
down a symbolic link, and later cd .. , you will get back
where you started. In contrast, the chdir routine will
follow the physical .. link in the file system.
If dir is - , it is replaced by the value of $OLDPWD .
Thus cd - is the same as cd $OLDPWD .
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