Command Description
- adduser Add a new user
- arch Print machine architecture
- awk Find and Replace text within file(s)
- bc An arbitrary precision calculator language
- cal Display a calendar
- cat Concatenate files and print on the standard output
- chdir Change working directory
- chgrp Change the group ownership of files
- chkconfig Tool for maintaining the /etc/rc[0-6].d directory hierarchy
- chmod Change the access permissions of files and directories
- chown Change the user and group ownership of files
- chroot Change root directory
- cksum Print CRC checksum and byte counts
- clear Clear terminal screen
- cmp Compare two files
- comm Compare two sorted files line by line
- cp Copy one or more files to another location
- cron Daemon to execute scheduled commands
- crontab Schedule a command to run at a later time
- csplit Split a file into context-determined pieces
- cut Divide a file into several parts
- date Display or change the date & time
- dc Desk Calculator
- dd Data Dump - Convert and copy a file
- df Display free disk space
- diff Display the differences between two files
- diff3 Show differences among three files
- dir Briefly list directory contents
- dircolors Colour setup for `ls'
- dirname Convert a full pathname to just a path
- du Estimate file space usage
- echo Display message on screen
- ed A line-oriented text editor (edlin)
- egrep Search file(s) for lines that match an extended expression
- eject Eject CD-ROM
- env Display, set, or remove environment variables
- expand Convert tabs to spaces
- expr Evaluate expressions
- factor Print prime factors
- false Do nothing, unsuccessfully
- fdformat Low-level format a floppy disk
- fdisk Partition table manipulator for Linux
- fgrep Search file(s) for lines that match a fixed string
- find Search for files that meet a desired criteria
- fmt Reformat paragraph text
- fold Wrap text to fit a specified width
- format Format disks or tapes
- free Display memory usage
- fsck Filesystem consistency check and repair
- gawk Find and Replace text within file(s)
- grep Search file(s) for lines that match a given pattern
- groups Print group names a user is in
- gzip Compress or decompress named file(s)
- head Output the first part of file(s)
- hostname Print or set system name
- id Print user and group id's
- info Help info
- install Copy files and set attributes
- join Join lines on a common field
- kill Stop a process from running
- less Display output one screen at a time
- ln Make links between files
- locate Find files
- logname Print current login name
- lpc Line printer control program
- lpr Off line print
- lprm Remove jobs from the print queue
- ls List information about file(s)
- man Help manual
- mkdir Create new folder(s)
- mkfifo Make FIFOs (named pipes)
- mknod Make block or character special files
- more Display output one screen at a time
- mount Mount a file system
- mv Move or rename files or directories
- nice Set the priority of a command or job
- nl Number lines and write files
- nohup Run a command immune to hangups
- passwd Modify a user password
- paste Merge lines of files
- pathchk Check file name portability
- pr Convert text files for printing
- printcap Printer capability database
- printenv Print environment variables
- printf Format and print data
- ps Process status
- pwd Print Working Directory
- quota Display disk usage and limits
- quotacheck Scan a file system for disk usage
- quotactl Set disk quotas
- ram ram disk device
- rcp Copy files between two machines
- rm Remove files
- rmdir Remove folder(s)
- rpm Remote Package Manager
- rsync Remote file copy (Synchronize file trees)
- screen Terminal window manager
- sdiff Merge two files interactively
- sed Stream Editor
- select Accept keyboard input
- seq Print numeric sequences
- shutdown Shutdown or restart linux
- sleep Delay for a specified time
- sort Sort text files
- split Split a file into fixed-size pieces
- su Substitute user identity
- sum Print a checksum for a file
- symlink Make a new name for a file
- sync Synchronize data on disk with memory
- tac Concatenate and write files in reverse
- tail Output the last part of files
- tar Tape Archiver
- tee Redirect output to multiple files
- test Evaluate a conditional expression
- time Measure Program Resource Use
- touch Change file timestamps
- top List processes running on the system
- traceroute Trace Route to Host
- tr Translate, squeeze, and/or delete characters
- true Do nothing, successfully
- tsort Topological sort
- tty Print filename of terminal on stdin
- umount Unmount a device
- uname Print system information
- unexpand Convert spaces to tabs
- uniq Uniquify files
- units Convert units from one scale to another
- unshar Unpack shell archive scripts
- useradd Create new user account
- usermod Modify user account
- users List users currently logged in
- uuencode Encode a binary file
- uudecode Decode a file created by uuencode
- vdir Verbosely list directory contents (`ls -l -b')
- watch Execute/display a program periodically
- wc Print byte, word, and line counts
- whereis Report all known instances of a command
- which Locate a program file in the user's path
- who Print all usernames currently logged in
- whoami Print the current user id and name (`id -un')
- xargs Execute utility, passing constructed argument list(s)
- yes Print a string until interrupted
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