Unix / Linux
A brief overview of each of the Unix / Linux commands
Unix / LINUX OVERVIEW
Below is a listing of each of the Unix / Linux commands currently listed
on Computer Hope and a brief explanation of what each of the commands
do. The following commands are all the Unix / Linux commands, which
means not all the below commands will work in your distribution of Unix /
Linux and may also not work because of your privileges.
COMMAND
a2p
alias
ac
ar
arch
as
at
awk
basename
bash
bc
bdiff
bfs
bg
biff
break
bs
bye
cal
calendar
cancel
cat
cc
cd
chdir
checkeq
checknr
chfn
chgrp
Index
Category
:
Linux /
Unix
Compani
DESCRIPTION
es:
Creates a Perl script from an awk script.
Click here
Create a name for another command or long command string.
Prints statistics about users' connect time.
Related
Pages:
Maintain portable archive or library.
MS-DOS
Display the architecture of the current host.
overview
An assembler.
Command scheduler.
Awk script processing program.
Deletes any specified prefix from a string.
Updates
Command Bourne interpreter
Calculator.
No Specific
Compare large files.
software
Editor for large files.
updates for
this topic.
Continues a program running in the background.
Enable / disable incoming mail notifications.
See
Break out of while, for, foreach, or until loop.
Download
Battleship game.
Page for
complete
Alias often used for the exit command.
listing of
Calendar
available
Display appointments and reminders.
software.
Cancels a print job.
View and/or modify a file.
C compiler.
Resolved
Change directory.
Change directory.
Language processors to assist in describing equations.
Were you
Check nroff and troff files for any errors.
able to
Modify your own information or if super user or root modify another
users
locate the
information.
answer to
Change a groups access to a file or directory.
your
chkey
chmod
chown
chsh
cksum
clear
cls
cmp
col
comm
compress
continue
copy
cp
cpio
crontab
csh
csplit
ctags
cu
cut
date
dc
df
deroff
diff
dircmp
dmesg
dos2unix
dpost
du
echo
ed
edit
egrep
elm
emacs
enable
env
eqn
ex
exit
questions?
Change the secure RPC key pair.
Change the permission of a file.
 Ye
Change the ownership of a file.
s
Change login shell.
 No
Display and calculate a CRC for files.
Clears screen.
Alias often used to clear a screen.
Compare files.
Reverse line-feeds filter.
Compare files and select or reject lines that are common.
Compress files on a computer.
Break out of while, for, foreach, or until loop.
Copy files.
Copy files.
Creates archived CPIO files.
Create and list files that you wish to run on a regular schedule.
Execute the C shell command interpreter
Split files based on context.
Create a tag file for use with ex and vi.
Calls or connects to another Unix system, terminal or non-Unix system.
Cut out selected fields of each line of a file.
Tells you the date and time in Unix.
An arbitrary precision arithmetic package.
Display the available disk space for each mount.
Removes nroff/troff, tbl, and eqn constructs.
Displays two files and prints the lines that are different.
Lists the different files when comparing directories.
Print or control the kernel ring buffer.
Converts text files between DOS and Unix formats.
Translates files created by troff into PostScript.
Tells you how much space a file occupies.
Displays text after echo to the terminal.
Line oriented file editor.
Text editor.
Search a file for a pattern using full regular expressions.
Program command used to send and receive e-mail.
Text editor.
Enables / Disables LP printers.
Displays environment variables.
Language processors to assist in describing equations.
Line-editor mode of the vi text editor.
Exit from a program, shell or log you out of a Unix network.
expand
expr
fc
fg
fgrep
file
find
finger
fmt
fold
for
foreach
fromdos
fsck
ftp
getfacl
gprof
grep
groupadd
groupdel
groupmod
gunzip
gview
gvim
gzip
halt
hash
hashstat
head
help
history
hostname
id
ifconfig
isalist
jobs
join
keylogin
kill
ksh
ld
Expand copies of file s.
Evaluate arguments as an expression.
The FC utility lists or edits and re-executes, commands previously entered to an
interactive sh.
Continues a stopped job by running it in the foreground
Search a file for a fixed-character string.
Tells you if the object you are looking at is a file or if it is a directory.
Finds one or more files assuming that you know their approximate filenames.
Lists information about the user.
Simple text formatters.
Filter for folding lines.
Shell built-in functions to repeatedly execute action(s) for a selected number of times.
Shell built-in functions to repeatedly execute action(s) for a selected number of times.
Converts text files between DOS and Unix formats.
Check and repair a Linux file system.
Enables ftp access to another terminal.
Display discretionary file information.
The gprof utility produces an execution profile of a program.
Finds text within a file.
Creates a new group account.
Enables a super user or root to remove a group.
Enables a super user or root to modify a group.
Expand compressed files.
A programmers text editor.
A programmers text editor.
Compress files.
Stop the computer.
Remove internal hash table.
Display the hash stats.
Displays the first ten lines of a file, unless otherwise stated.
If computer has online help documentation installed this command will display it.
Display the history of commands typed.
Set or print name of current host system.
Shows you the numeric user and group ID on BSD.
Sets up network interfaces.
Display the native instruction sets executable on this platform.
List the jobs currently running in the background.
Joins command forms together.
Decrypt the user's secret key.
Cancels a job.
Korn shell command interpreter.
Link-editor for object files.
ldd
less
lex
ln
lo
locate
login
logname
logout
lp
lpadmin
lpc
lpq
lpr
lprm
lpstat
ls
mach
mail
mailcompat
mailx
make
man
mesg
mkdir
mkfs
more
mount
mt
mv
neqn
netstat
newalias
newform
newgrp
nice
niscat
nischmod
nischown
nischttl
nisdefaults
nisgrep
List dynamic dependencies of executable files or shared objects.
Opposite of the more command.
Generate programs for lexical tasks.
Creates a link to a file.
Allows you to exit from a program, shell or log you out of a Unix network.
List files in databases that match a pattern.
Signs into a new system.
Returns users login name.
Logs out of a system.
Prints a file on System V systems.
Configure the LP print service.
Line printer control program.
Lists the status of all the available printers.
Submits print requests.
Removes print requests from the print queue.
Lists status of the LP print services.
Lists the contents of a directory.
Display the processor type of the current host.
One of the ways that allows you to read/send E-Mail.
Provide SunOS 4.x compatibility for the Solaris mailbox format.
Mail interactive message processing system.
Executes a list of shell commands associated with each target.
Display a manual of a command.
Control if non-root users can send text messages to you.
Create a directory.
Build a Linux file system, usually a hard disk partition.
Displays text one screen at a time.
Disconnects a file systems and remote resources.
Magnetic tape control.
Renames a file or moves it from one directory to another directory.
Language processors to assist in describing equations.
Shows network status.
Install new elm aliases for user and/or system.
Change the format of a text file.
Log into a new group.
Invokes a command with an altered scheduling priority.
Display NIS+ tables and objects.
Change access rights on a NIS+ object.
Change the owner of a NIS+ object.
Change the time to live value of a NIS+ object.
Display NIS+ default values.
Utilities for searching NIS+ tables.
nismatch
nispasswd
nistbladm
nohup
nroff
nslookup
on
onintr
optisa
pack
pagesize
passwd
paste
pax
pcat
perl
pg
pgrep
pico
ping
pkill
poweroff
pr
priocntl
printf
ps
pvs
pwd
quit
rcp
reboot
red
rehash
remsh
repeat
rgview
rgvim
rlogin
rm
rmail
Utilities for searching NIS+ tables.
Change NIS+ password information.
NIS+ table administration command.
Runs a command even if the session is disconnected or the user logs out.
Formats documents for display or line-printer.
Queries a name server for a host or domain lookup.
Execute a command on a remote system, but with the local environment.
Shell built-in functions to respond to (hardware) signals.
Determine which variant instruction set is optimal to use.
Shrinks file into a compressed file.
Display the size of a page of memory in bytes, as returned by getpagesize.
Allows you to change your password.
Merge corresponding or subsequent lines of files.
Read / write and writes lists of the members of archive files and copy directory
hierarchies.
Compresses file.
Perl is a programming language optimized for scanning arbitrary text files, extracting
information from those text files.
Files perusal filters for CRTs.
Examine the active processes on the system and reports the process IDs of the processes
Simple and very easy to use text editor in the style of the Pine Composer.
Sends ICMP ECHO_REQUEST packets to network hosts.
Examine the active processes on the system and reports the process IDs of the processes
Stop the computer.
Formats a file to make it look better when printed.
Display's or set scheduling parameters of specified process(es)
Write formatted output.
Reports the process status.
Display the internal version information of dynamic objects within an ELF file.
Print the current working directory.
Allows you to exit from a program, shell or log you out of a Unix network.
Copies files from one computer to another computer.
Stop the computer.
Line oriented file editor.
Recomputes the internal hash table of the contents of directories listed in the path.
Runs a command on another computer.
Shell built-in functions to repeatedly execute action(s) for a selected number of times.
A programmers text editor.
A programmers text editor.
Establish a remote connection from your terminal to a remote machine.
Deletes a file without confirmation (by default).
One of the ways that allows you to read/send E-Mail.
rmdir
rn
rpcinfo
rsh
rsync
rview
rvim
s2p
sag
sar
script
sdiff
sed
sendmail
set
setenv
setfacl
settime
sftp
sh
shred
shutdown
sleep
slogin
sort
spell
split
stat
stop
strip
stty
su
sysinfo
sysklogd
tabs
tail
talk
tac
tar
tbl
Deletes a directory.
Reads newsgroups.
Report RPC information.
Runs a command on another computer.
Faster, flexible replacement for rcp.
A programmers text editor.
A programmers text editor.
Convert a sed script into a Perl script.
Graphically displays the system activity data stored in a binary data file by a previous
sar run.
Displays the activity for the CPU.
Records everything printed on your screen.
Compares two files, side-by-side.
Allows you to use pre-recorded commands to make changes to text.
Sends mail over the internet.
Set the value of an environment variable.
Set the value of an environment variable.
Modify the Access Control List (ACL) for a file or files.
Change file access and modification time.
Secure file transfer program.
Runs or processes jobs through the Bourne shell.
Delete a file securely, first overwriting it to hide its contents.
Turn off the computer immediately or at a specified time.
Waits a x amount of seconds.
OpenSSH SSH client (remote login program).
Sorts the lines in a text file.
Looks through a text file and reports any words that it finds in the text file that are not
in the dictionary.
Split a file into pieces.
Display file or filesystem status.
Control process execution.
Discard symbols from object files.
Sets options for your terminal.
Become super user or another user.
Get and set system information strings.
Linux system logging utilities.
Set tabs on a terminal.
Delivers the last part of the file.
Talk with other logged in users.
Concatenate and print files in reverse.
Create tape archives and add or extract files.
Preprocessor for formatting tables for nroff or troff.
tcopy
tee
telnet
time
timex
todos
top
touch
tput
tr
traceroute
troff
ul
umask
unalias
unhash
uname
uncompress
uniq
unmount
unpack
untar
until
useradd
userdel
usermod
vacation
vedit
vgrind
vi
vim
view
wait
wc
whereis
while
which
who
whois
write
X
xfd
Copy a magnetic tape.
Read from an input and write to a standard output or file.
Uses the telnet protocol to connect to another remote computer.
Used to time a simple command.
The timex command times a command; reports process data and system activity.
Converts text files between DOS and Unix formats.
Display Linux tasks.
Change file access and modification time.
Initialize a terminal or query terminfo database.
Translate characters.
Print the route packets take to network host.
Typeset or format documents.
Reads the named filenames or terminal and does underlining.
Get or set the file mode creation mask.
Remove an alias.
Remove internal hash table.
Print name of current system.
Uncompressed compressed files.
Report or filter out repeated lines in a file.
Crates a file systems and remote resources.
Expands a compressed file.
Create tape archives and add or extract files.
Execute a set of actions while/until conditions are evaluated TRUE.
Create a new user or updates default new user information.
Remove a users account.
Modify a users account.
Reply to mail automatically.
Screen-oriented (visual) display editor based on ex.
Grind nice program listings
Screen-oriented (visual) display editor based on ex.
A programmers text editor.
A programmers text editor.
Await process completion.
Displays a count of lines, words, and characters in a file
Locate a binary, source, and manual page files for a command.
Repetitively execute a set of actions while/until conditions are evaluated TRUE.
Locate a command.
Displays who is on the system.
Internet user name directory service.
Send a message to another user.
Execute the X windows system.
Display all the characters in an X font.
xlsfonts
xset
xterm
xrdb
yacc
yes
yppasswd
zcat
Server font list displayer for X.
User preference utility for X.
Terminal emulator for X.
X server resource database utility.
Short for yet another compiler-compiler, yacc is a compiler.
Repeatedly output a line with all specified STRING(s), or 'y'.
Changes network password in the NIS database.
Compress files.
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