chdir(EXPR): changes the working directory to EXPR, if EXPR is omitted then changes to home directory. refer to chdir in perl for more details.
chmod: changes the permission on a list of files.
glob:expand filenames using wild card
link: create a hard link in the system
lstat: stat a symbolic link
mkdir: makes a directory, similar to md dos command
opendir: opens a directory in code and gives directory handle.
readlink: determines where a symbolic link is pointing
rename: change a filename
unlink: deletes a file permanently
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