1Command adduser |Add a user to the system
2Command addgroup |Add a group to the system
3Command alias |Create an alias
4Command apropos |Search Help manual pages (man -k)
5Command apt-get |Search for and install software packages (Debian/Ubuntu)
6Command aptitude |Search for and install software packages (Debian/Ubuntu)
7Command aspell |Spell Checker
8Command awk |Find and Replace text, database sort/validate/index
9Command basename |Strip directory and suffix from filenames
10Command bash |GNU Bourne-Again SHell
11Command bc |Arbitrary precision calculator language
12Command bg |Send to background
13Command break |Exit from a loop
14Command builtin |Run a shell builtin
15Command bzip2 |Compress or decompress named file(s)
16Command cal |Display a calendar
17Command case |Conditionally perform a command
18Command cat |Display the contents of a file
19Command cd |Change Directory
20Command cfdisk |Partition table manipulator for Linux
21Command chgrp |Change group ownership
22Command chmod |Change access permissions
23Command chown |Change file owner and group
24Command chroot |Run a command with a different root directory
25Command chkconfig |System services (runlevel)
26Command cksum |Print CRC checksum and byte counts
27Command clear |Clear terminal screen
28Command cmp |Compare two files
29Command comm |Compare two sorted files line by line
30Command command |Run a command - ignoring shell functions
31Command continue |Resume the next iteration of a loop
32Command cp |Copy one or more files to another location
33Command cron |Daemon to execute scheduled commands
34Command crontab |Schedule a command to run at a later time
35Command csplit |Split a file into context-determined pieces
36Command cut |Divide a file into several parts
37Command date |Display or change the date & time
38Command dc |Desk Calculator
39Command dd |Convert and copy a file, write disk headers, boot records
40Command ddrescue |Data recovery tool
41Command declare |Declare variables and give them attributes
42Command df |Display free disk space
43Command diff |Display the differences between two files
44Command diff3 |Show differences among three files
45Command dig |DNS lookup
46Command dir |Briefly list directory contents
47Command dircolors |Colour setup for `ls'
48Command dirname |Convert a full pathname to just a path
49Command dirs |Display list of remembered directories
50Command dmesg |Print kernel & driver messages
51Command du |Estimate file space usage
52Command echo |Display message on screen
53Command egrep |Search file(s) for lines that match an extended expression
54Command eject |Eject removable media
55Command enable |Enable and disable builtin shell commands
56Command env |Environment variables
57Command ethtool |Ethernet card settings
58Command eval |Evaluate several commands/arguments
59Command exec |Execute a command
60Command exit |Exit the shell
61Command expect |Automate arbitrary applications accessed over a terminal
62Command expand |Convert tabs to spaces
63Command export |Set an environment variable
64Command expr |Evaluate expressions
65Command false |Do nothing, unsuccessfully
66Command fdformat |Low-level format a floppy disk
67Command fdisk |Partition table manipulator for Linux
68Command fg |Send job to foreground
69Command fgrep |Search file(s) for lines that match a fixed string
70Command file |Determine file type
71Command find |Search for files that meet a desired criteria
72Command fmt |Reformat paragraph text
73Command fold |Wrap text to fit a specified width.
74Command for |Expand words, and execute commands
75Command format |Format disks or tapes
76Command free |Display memory usage
77Command fsck |File system consistency check and repair
78Command ftp |File Transfer Protocol
79Command function |Define Function Macros
80Command fuser |Identify/kill the process that is accessing a file
81Command gawk |Find and Replace text within file(s)
82Command getopts |Parse positional parameters
83Command grep |Search file(s) for lines that match a given pattern
84Command groups |Print group names a user is in
85Command gzip |Compress or decompress named file(s)
86Command hash |Remember the full pathname of a name argument
87Command head |Output the first part of file(s)
88Command help |Display help for a built-in command
89Command history |Command History
90Command hostname |Print or set system name
91Command id |Print user and group id's
92Command if |Conditionally perform a command
93Command ifconfig |Configure a network interface
94Command ifdown |Stop a network interface
95Command ifup |Start a network interface up
96Command import |Capture an X server screen and save the image to file
97Command install |Copy files and set attributes
98Command jobs |List active jobs
99Command join |Join lines on a common field
100Command kill |Stop a process from running
101Command killall |Kill processes by name
102Command less |Display output one screen at a time
103Command let |Perform arithmetic on shell variables
104Command ln |Make links between files
105Command local |Create variables
106Command locate |Find files
107Command logname |Print current login name
108Command logout |Exit a login shell
109Command look |Display lines beginning with a given string
110Command lpc |Line printer control program
111Command lpr |Off line print
112Command lprint |Print a file
113Command lprintd |Abort a print job
114Command lprintq |List the print queue
115Command lprm |Remove jobs from the print queue
116Command ls |List information about file(s)
117Command lsof |List open files
118Command make |Recompile a group of programs
119Command man |Help manual
120Command mkdir |Create new folder(s)
121Command mkfifo |Make FIFOs (named pipes)
122Command mkisofs |Create an hybrid ISO9660/JOLIET/HFS filesystem
123Command mknod |Make block or character special files
124Command more |Display output one screen at a time
125Command mount |Mount a file system
126Command mtools |Manipulate MS-DOS files
127Command mtr |Network diagnostics (traceroute/ping)
128Command mv |Move or rename files or directories
129Command mmv |Mass Move and rename (files)
130Command netstat |Networking information
131Command nice |Set the priority of a command or job
132Command nl |Number lines and write files
133Command nohup |Run a command immune to hangups
134Command notify-send |Send desktop notifications
135Command nslookup |Query Internet name servers interactively
136Command open |Open a file in its default application
137Command op |Operator access
138Command passwd |Modify a user password
139Command paste |Merge lines of files
140Command pathchk |Check file name portability
141Command ping |Test a network connection
142Command pkill |Stop processes from running
143Command popd |Restore the previous value of the current directory
144Command pr |Prepare files for printing
145Command printcap |Printer capability database
146Command printenv |Print environment variables
147Command printf |Format and print data
148Command ps |Process status
149Command pushd |Save and then change the current directory
150Command pwd |Print Working Directory
151Command quota |Display disk usage and limits
152Command quotacheck |Scan a file system for disk usage
153Command quotactl |Set disk quotas
154Command ram |ram disk device
155Command rcp |Copy files between two machines
156Command read |Read a line from standard input
157Command readarray |Read from stdin into an array variable
158Command readonly |Mark variables/functions as readonly
159Command reboot |Reboot the system
160Command rename |Rename files
161Command renice |Alter priority of running processes
162Command remsync |Synchronize remote files via email
163Command return |Exit a shell function
164Command rev |Reverse lines of a file
165Command rm |Remove files
166Command rmdir |Remove folder(s)
167Command rsync |Remote file copy (Synchronize file trees)
168Command screen |Multiplex terminal, run remote shells via ssh
169Command scp |Secure copy (remote file copy)
170Command sdiff |Merge two files interactively
171Command sed |Stream Editor
172Command select |Accept keyboard input
173Command seq |Print numeric sequences
174Command set |Manipulate shell variables and functions
175Command sftp |Secure File Transfer Program
176Command shift |Shift positional parameters
177Command shopt |Shell Options
178Command shutdown |Shutdown or restart linux
179Command sleep |Delay for a specified time
180Command slocate |Find files
181Command sort |Sort text files
182Command source |Run commands from a file `.'
183Command split |Split a file into fixed-size pieces
184Command ssh |Secure Shell client (remote login program)
185Command strace |Trace system calls and signals
186Command su |Substitute user identity
187Command sudo |Execute a command as another user
188Command sum |Print a checksum for a file
189Command suspend |Suspend execution of this shell
190Command symlink |Make a new name for a file
191Command sync |Synchronize data on disk with memory
192Command tail |Output the last part of files
193Command tar |Tape ARchiver
194Command tee |Redirect output to multiple files
195Command test |Evaluate a conditional expression
196Command time |Measure Program running time
197Command times |User and system times
198Command touch |Change file timestamps
199Command top |List processes running on the system
200Command traceroute |Trace Route to Host
201Command trap |Run a command when a signal is set(bourne)
202Command tr |Translate, squeeze, and/or delete characters
203Command true |Do nothing, successfully
204Command tsort |Topological sort
205Command tty |Print filename of terminal on stdin
206Command type |Describe a command
207Command ulimit |Limit user resources
208Command umask |Users file creation mask
209Command umount |Unmount a device
210Command unalias |Remove an alias
211Command uname |Print system information
212Command unexpand |Convert spaces to tabs
213Command uniq |Uniquify files
214Command units |Convert units from one scale to another
215Command unset |Remove variable or function names
216Command unshar |Unpack shell archive scripts
217Command until |Execute commands (until error)
218Command useradd |Create new user account
219Command usermod |Modify user account
220Command users |List users currently logged in
221Command uuencode |Encode a binary file
222Command uudecode |Decode a file created by uuencode
223Command v |Verbosely list directory contents (`ls -l -b')
224Command vdir |Verbosely list directory contents (`ls -l -b')
225Command vi |Text Editor
226Command vmstat |Report virtual memory statistics
227Command watch |Execute/display a program periodically
228Command wc |Print byte, word, and line counts
229Command whereis |Search the user's $path, man pages and source files for a program
230Command which |Search the user's $path for a program file
231Command while |Execute commands
232Command who |Print all usernames currently logged in
233Command whoami |Print the current user id and name (`id -un')
234Command Wget |Retrieve web pages or files via HTTP, HTTPS or FTP
235Command write |Send a message to another user
236Command xargs |Execute utility, passing constructed argument list(s)
237Command xdg-open |Open a file or URL in the user's preferred application.
238Command yes |Print a string until interrupted
239