Thursday, 2 February 2012

A to Z Linux Commands

A to Z Linux Commands



  Here are some linux commands for you so you can make your hands more and more dirty with ubuntu terminal.
mkisofs  Create an hybrid ISO9660/JOLIET/HFS filesystem

mknod
 Make block or character special files
more
 Display output one screen at a time
mount
 Mount a file system
mtools
 Manipulate MS-DOS files
mtr  Network diagnostics (traceroute/ping)
mv
 Move or rename files or directories
adduser  Add a user to the system

addgroup Add a group to the system

alias
 Create an alias •
apropos  Search Help manual pages (man -k)

apt-get
 Search for and install software packages (Debian/Ubuntu)
aptitude
 Search for and install software packages (Debian/Ubuntu)
aspell
 Spell Checker
awk
 Find and Replace text, database sort/validate/index
b

basename
 Strip directory and suffix from filenames
bash     GNU Bourne-Again SHell

bc
 Arbitrary precision calculator language
bg
 Send to background
break
 Exit from a loop •
builtin
 Run a shell builtin
bzip2
 Compress or decompress named file(s)
c

cal
 Display a calendar
case
 Conditionally perform a command
cat
 Display the contents of a file
cd
 Change Directory
cfdisk
 Partition table manipulator for Linux
chgrp
 Change group ownership
chmod
 Change access permissions
chown
 Change file owner and group
chroot
 Run a command with a different root directory
chkconfig
 System services (runlevel)
cksum
 Print CRC checksum and byte counts
clear    Clear terminal screen

cmp
 Compare two files
comm
 Compare two sorted files line by line
command
 Run a command – ignoring shell functions •
continue
 Resume the next iteration of a loop •
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
d

date
 Display or change the date & time
dc
 Desk Calculator
dd
 Convert and copy a file, write disk headers, boot records
ddrescue
 Data recovery tool
declare
 Declare variables and give them attributes •
df
 Display free disk space
diff
 Display the differences between two files
diff3
 Show differences among three files
dig
 DNS lookup
dir
 Briefly list directory contents
dircolors
 Colour setup for `ls’
dirname
 Convert a full pathname to just a path
dirs
 Display list of remembered directories
dmesg
 Print kernel & driver messages
du
 Estimate file space usage

e

echo
 Display message on screen •
egrep
 Search file(s) for lines that match an extended expression
eject
 Eject removable media
enable
 Enable and disable builtin shell commands •
env
 Environment variables
ethtool  Ethernet card settings

eval
 Evaluate several commands/arguments
exec
 Execute a command
exit
 Exit the shell
expect
 Automate arbitrary applications accessed over a terminal
expand
 Convert tabs to spaces
export
 Set an environment variable
expr
 Evaluate expressions
f

false
 Do nothing, unsuccessfully
fdformat
 Low-level format a floppy disk
fdisk
 Partition table manipulator for Linux
fg
 Send job to foreground
fgrep
 Search file(s) for lines that match a fixed string
file     Determine file type

find
 Search for files that meet a desired criteria
fmt
 Reformat paragraph text
fold
 Wrap text to fit a specified width.
for
 Expand words, and execute commands
format   Format disks or tapes

free     Display memory usage

fsck
 File system consistency check and repair
ftp      File Transfer Protocol

function
 Define Function Macros
fuser
 Identify/kill the process that is accessing a file
g

gawk
 Find and Replace text within file(s)
getopts
 Parse positional parameters
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)
h

hash
 Remember the full pathname of a name argument
head
 Output the first part of file(s)
help     Display help for a built-in command •

history
 Command History
hostname
 Print or set system name
i

id
 Print user and group id’s
if
 Conditionally perform a command
ifconfig
 Configure a network interface
ifdown
 Stop a network interface
ifup
 Start a network interface up
import
 Capture an X server screen and save the image to file
install
 Copy files and set attributes
j

jobs
 List active jobs •
join
 Join lines on a common field
k

kill
 Stop a process from running
killall
 Kill processes by name
l

less
 Display output one screen at a time
let
 Perform arithmetic on shell variables •
ln
 Make links between files
local
 Create variables •
locate
 Find files
logname
 Print current login name
logout
 Exit a login shell •
look
 Display lines beginning with a given string
lpc
 Line printer control program
lpr
 Off line print
lprint   Print a file

lprintd  Abort a print job

lprintq  List the print queue

lprm
 Remove jobs from the print queue
ls
 List information about file(s)
lsof
 List open files
m

make     Recompile a group of programs

man
 Help manual
mkdir
 Create new folder(s)
mkfifo
 Make FIFOs (named pipes)
mmv
 Mass Move and rename (files)
n

netstat  Networking information

nice
 Set the priority of a command or job
nl
 Number lines and write files
nohup
 Run a command immune to hangups
Notify-send
 Send desktop notifications
nslookup
 Query Internet name servers interactively
o
open
 Open a file in its default application
op
 Operator access
p

passwd
 Modify a user password
paste
 Merge lines of files
pathchk  Check file name portability

ping
 Test a network connection
pkill
 Stop processes from running
popd
 Restore the previous value of the current directory
pr
 Prepare files for printing
printcap Printer capability database

printenv Print environment variables

printf
 Format and print data •
ps
 Process status
pushd
 Save and then change the current directory
pwd
 Print Working Directory
q

quota
 Display disk usage and limits
quotacheck
 Scan a file system for disk usage
quotactl
 Set disk quotas
r

ram
 ram disk device
rcp
 Copy files between two machines
read
 Read a line from standard input •
readarray Read from stdin into an array variable •

readonly
 Mark variables/functions as readonly
reboot   Reboot the system

rename
 Rename files
renice   Alter priority of running processes

remsync  Synchronize remote files via email

return
 Exit a shell function
rev
 Reverse lines of a file
rm
 Remove files
rmdir
 Remove folder(s)
rsync
 Remote file copy (Synchronize file trees)
s

screen
 Multiplex terminal, run remote shells via ssh
scp
 Secure copy (remote file copy)
sdiff
 Merge two files interactively
sed
 Stream Editor
select
 Accept keyboard input
seq
 Print numeric sequences
set
 Manipulate shell variables and functions
sftp     Secure File Transfer Program

shift
 Shift positional parameters
shopt
 Shell Options
shutdown
 Shutdown or restart linux
sleep
 Delay for a specified time
slocate
 Find files
sort
 Sort text files
source
 Run commands from a file `.’
split
 Split a file into fixed-size pieces
ssh
 Secure Shell client (remote login program)
strace   Trace system calls and signals

su
 Substitute user identity
sudo
 Execute a command as another user
sum
 Print a checksum for a file
suspend
 Suspend execution of this shell •
symlink
 Make a new name for a file
sync
 Synchronize data on disk with memory
t

tail
 Output the last part of files
tar
 Tape ARchiver
tee
 Redirect output to multiple files
test
 Evaluate a conditional expression
time
 Measure Program running time
times
 User and system times
touch
 Change file timestamps
top
 List processes running on the system
traceroute
 Trace Route to Host
trap     Run a command when a signal is set(bourne)

tr
 Translate, squeeze, and/or delete characters
true
 Do nothing, successfully
tsort
 Topological sort
tty
 Print filename of terminal on stdin
type
 Describe a command •
u

ulimit
 Limit user resources •
umask
 Users file creation mask
umount   Unmount a device

unalias
 Remove an alias •
uname
 Print system information
unexpand
 Convert spaces to tabs
uniq
 Uniquify files
units
 Convert units from one scale to another
unset
 Remove variable or function names
unshar
 Unpack shell archive scripts
until
 Execute commands (until error)
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
v

v        Verbosely list directory contents (`ls -l -b’)

vdir     Verbosely list directory contents (`ls -l -b’)

vi
 Text Editor
vmstat
 Report virtual memory statistics
w

watch
 Execute/display a program periodically
wc
 Print byte, word, and line counts
whereis
 Search the user’s $path, man pages and source files for a program
which
 Search the user’s $path for a program file
while
 Execute commands
who
 Print all usernames currently logged in
whoami
 Print the current user id and name (`id -un’)
Wget     Retrieve web pages or files via HTTP, HTTPS or FTP

write
 Send a message to another user
x

xargs
 Execute utility, passing constructed argument list(s)
xdg-open
 Open a file or URL in the user’s preferred application.
yes
 Print a string until interrupted
.
 Run a command script in the current shell
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