Unix in a Nutshell, 4th Edition

File Management

cd	Change directory.
chgrp	Change file group.
chmod	Change access modes on files.
chown	Change file owner.
cksum	Print a file checksum, POSIX standard algorithm.
cp	Copy files.
csplit	Break files at specific locations.
file	Determine a file’s type.
head	Show the first few lines of a file.
less	A sophisticated interactive pager program for looking at information on a terminal, one screenful (or “page”) at a time. The name is a pun on the more program.
ln	Create filename aliases.
locate	Find a file somewhere on the system based on its name. The program uses a database of files that is usually automatically rebuilt, nightly.
ls	List files or directories.
md5sum	Print a file checksum using the Message Digest 5 (MD5) algorithm.
mkdir	Create a directory.
more	Display files by screenful.
mv	Move or rename files or directories.
pwd	Print working directory.
rm	Remove files.
rmdir	Remove directories.
scp	Copy files to remote system securely.
split	Split files evenly.
tail	Show the last few lines of a file.
wc	Count lines, words, and characters.