Classic Shell Scripting

Files

The following commands work with files:

bzip2, bunzip2	Very high quality file compression and decompression.
chgrp	Change the group of files and directories.
chmod	Change the permissions (mode) of files and directories.
chown	Change the owner of files and directories.
cksum	Print a file checksum, POSIX standard algorithm.
comm	Print or omit lines that are unique or common between two sorted files.
cp	Copy files and directories.
df	Show free disk space.
diff	Compare files, showing differences.
du	Show disk block usage of files and directories.
file	Guess the type of data in a file by examining the first part of it.
find	Descend one or more directory hierarchies finding filesystem objects (files, directories, special files) that match specified criteria.
gzip, gunzip	High-quality file compression and decompression.
head	Print the first n lines of one or more files.
locate	Find a file somewhere on the system based on its name. The program uses a database of files that is usually rebuilt automatically, nightly.
ls	List files. Options control the information shown.
md5sum	Print a file checksum using the Message Digest 5 (MD5) algorithm.
mkdir	Make directories.
mktemp	Create a unique temporary file and print its name. Not universally available.
od	Octal dump; print file contents in octal, hexadecimal, or as character data.
patch	Update the contents of a given file to a newer version by reading the output of diff.
pwd	Print the current ...