Linux Page

Overview

File directory Shell archieve search System info Process Schedule help Maths User Hardware Useful command Others Network

1: File
used to display the large file More & less it is do scroll bar task of windows
pg
display first or last given no. Of lines of file Head & tail
display content of file cat
sort the file content sort
remove duplicate line of given file uniq
create a empty file in given name touch c
display content type of a file file
get only file without path basename
mv
rm
copy file cp
change permission on a file chmod
change group of a file chgrp
change owner of a file( only super user ) chown

2: directory
present working directory pwd
change directory cd
list directory ls
create directory mkdir
delete directory rmdir

3: Shell
change the default login shell chsh
list the command history of shell fc l
recently used commands history
I am not clear stty
to record current session in a file ( it will useful to give another developer wht to do ) Script & exit -a
to lanuch another command exec
config network devices ifconfig
to reflect configuration file changes to current session without logout source
shell sleep for given seconds sleep
to terminate shell script execution exit
make is command to create binary file ( like ant ) make
always return true used in shell scripting (Built in command in shell itself . No binary file for this command) 1
always return true used in shell scripting (Built in command in shell itself . No binary file for this command) 0
case
while
for
if
Built in command in shell itself for test numeric, string and file comparision . No binary file for this command in system. test
it used to identity shell built in commands like true, false, test, [, etc. type itself built in command type ex: type test, type true
it is used to define a function declare f
null command ( colon ) :
execute shell script file ( dot ) .
change directory to home directory ( note. No argument ) cd
echo
eval
exec
exit the current shell exit
to make avilable a variable for sub shell export
pwd
read
set
trap
all the user defined alias stored in .bashrc file for bash shell alias
test command's alternative [
truncate the file >or : >
continuation for command line \
input rediirect from a file <
redirect output and append if a file alreay >>
redirect output and truncate if file already >
recirect output of a command to ANOTHER COMMAND
to run a command in background mode &
current process id $$
recent background process id $!
recent process or command's exit status $?
diplay only GLOBAL the environment variable env
diplay only GLOBAL the environment variable printenv
diplay all LOCAL as well as ENVIRONMENT (exported ) the environment variable set
Make unavailable variable name and any user defined function unset
diplay only GLOBAL the environment variable env

4: archieve
make many file to single file tar c, f
compress and expand utility zcat
data dumper dd
compress while creating archieve file compress
uncompress while extracting archieve file uncompress
it is best compare with compress command. It take a tar file to compress gzip
it is lates of gzip bzip2
to un compress a compressed file by gzip gunzip
it has both create and compress the archieve file. It useful to if file used in window os zip

5: search
search a given file in computer using metadata but not by content of file( it check all dir/subdirecory ) find
quick search in system database for given file ( check only PATH value ) locate
search a line in file for given regular expression grep I,v,n,c
extended grep egrep
used to search for given TEXT for given files fgrep I,v,n
translate SINGLE charactors usually, special \n, \t, or any alphanumic charactor tr
used to find/replace/search MORE THAN One Charactor sed e
another popular stream editor like sed awk/gawk
find printable string in a file strings

6: System info
to list name of installed package, it is debian specific dpkg -l RedHad and suse are mostly used in industries
who are all logged in, administrative command Who & W
who are all logged in, administrative command finger
display the current user whoami
to log off from system logout
to know how long a given command executed time

7: Process
to list name of process ps e, f, a, u, x forest
to send ANY singal to running process kill l
display the process in tree structure pstree
display top 5 proecess top
show virutual memory statuss vmstat
to bring a background process to forgroound fg
to move a foreground process to background bg
to run any process in background [command]&
size of memory segment of a process size
usage of shared library ldd
i dont know ulimit

8: Schedule
used to edit etc/crontab file, crontab
it is process thread, check periodically etc/crontab file cron
run a task at specfic (run only one) time, it is deamon process atd

9: help
to know path of a command (that is existence of command in os ) which which ls/cd/mv/etc.
to know all path of a command ( binary, source, man page ) whereis s,b,m
to know the command information apropos
short version of a command info
Display detail help content of a command man -k

10: Maths
desktop calucator ( like our calc ) dc
more complex float or double artimetic operation bc
expression evaluation expr
open GUI calculator xcalc

11: User
change the password passwd vmc server install in linux , and use client in window machine.
id of current user id it just a mechanism to manage the users
to list name of groups in system groups it just a mechanism to manage the users

12: Hardware
disk free information of each disk or partition df
size of current folder / file du -hs
to check the file system for inconsistency( any dirty ) fsck
scandisk
display the OS name, processor, mother board architecure, etc, uname o, hardware-platform, p,a, all
give name of computer hostname
mount a file system under unix file system mount
un mount a file system under unix file system umount
display x widget package xdpyinfo
dd

13: Useful command
find delete files find . -type f -name "FILE-TO-FIND" -exec rm -f {} \;

14: Others
translate SINGLE charactors usually, special \n, \t, or any alphanumic charactor tr
screen shot xv
screen shot xwd
screen shot gimp
screen shot xeyes

15: Network
email utility mail
email utility mailx

results matching ""

    No results matching ""