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1.
BASIC COMMANDS IN LINUX Session – I Kanchi Linux User Group Presented By Mr.Thanigai
2.
Whoami : arul@aruldesktop:~$ whoami arul This command helps to identify login user name su : arul@aruldesktop:~$ su Password: root@aruldesktop:~# This command helps to Switch User from any user to Root user Root user means (#) symbol will display at the end of terminal default line. Normal user ($) symbol will display . . . logout : root@aruldesktop:~# logout arul@aruldesktop:~$ logout helps to logout from last login user root@aruldesktop:~# su arul arul@aruldesktop:~$ su ' user name ' will also helps to change the user clear : arul@aruldesktop:~$ clear It helps to clear the terminal page (ctl + l )
3.
ls : arul@aruldesktop:~$ ls Arulalan.jpg arul_gsoc_2009 arul.pdf Desktop Documents Examples It helps to list out all files and directories ls l : arul@aruldesktop:~$ ls l total 2068980 rwrr 1 arul arul 29055 20090523 23:38 Arulalan.jpg drwxrwxrwx 3 amma shrini 4096 20090405 14:53 arul_gsoc_2009 rwrr 1 arul arul 34217 20090529 19:16 arul.pdf drwxrwxrwx 12 root root 4096 20090531 14:46 Desktop drwxrwxrwx 3 root root 4096 20090517 15:39 Documents It will display list of files with User , Group, Others Permissions and their size in bytes. ls lh : arul@aruldesktop:~$ ls lh total 2.0G rwrr 1 arul arul 29K 20090523 23:38 Arulalan.jpg drwxrwxrwx 3 amma shrini 4.0K 20090405 14:53 arul_gsoc_2009 rwrr 1 arul arul 34K 20090529 19:16 arul.pdf drwxrwxrwx 12 root root 4.0K 20090531 14:46 Desktop drwxrwxrwx 3 root root 4.0K 20090517 15:39 Documents It will display file size with human readable form .
4.
pwd : arul@aruldesktop:~$ pwd /home/arul It is precent working directory cd cd .. cd ~ arul@aruldesktop:~$ cd Desktop/ arul@aruldesktop:~/Desktop$ cd .. arul@aruldesktop:~$ cd : change directory arul@aruldesktop:~/Desktop/Himalayas/linux $ cd ~ arul@aruldesktop:~$ cd ~ : ~ symbol helps to change directory from any where to home directory. arul@aruldesktop:~$ cd /home arul@aruldesktop:/home$ ls amma arul ftp lost+found shrini sudo : “ sudo “ helps to give root authendication permission for upcomming commands followed by sudo, with current user's password. adduser : arul@aruldesktop:~$ sudo adduser [sudo] password for arul:
5.
adduser: Only one or two names allowed. arul@aruldesktop:~$ sudo adduser god Adding user `god' ... Adding new group `god' (1004) ... Adding new user `god' (1003) with group `god' ... Creating home directory `/home/god' ... Copying files from `/etc/skel' ... Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully Changing the user information for god Enter the new value, or press ENTER for the default
Full Name []: GOD Room Number []: 0 Work Phone []: Home Phone []: Other []: Is the information correct? [Y/n] y arul@aruldesktop:~$ cd /home arul@aruldesktop:/home$ ls amma arul ftp god lost+found shrini adduser helps to add user chmod : arul@aruldesktop:~/klug$ ls l total 564 drwx 2 arul arul 4096 20090526 23:50 bajji rwx 1 arul arul 616 20090518 11:08 kanchilug emails & b' days rwrr 1 arul arul 338 20090522 19:43 kanchilug freelist . . . arul@aruldesktop:~/klug$ chmod o+rwx kanchilug emails & b' days arul@aruldesktop:~/klug$ ls l total 564 drwx 2 arul arul 4096 20090526 23:50 bajji rwxrwx 1 arul arul 616 20090518 11:08 kanchilug emails & b' days rwrr 1 arul arul 338 20090522 19:43 kanchilug freelist
6.
arul@aruldesktop:~/klug$ chmod 777 kanchilug freelist arul@aruldesktop:~/klug$ ls l total 564 drwx 2 arul arul 4096 20090526 23:50 bajji rwxrwx 1 arul arul 616 20090518 11:08 kanchilug emails & b' days rwxrwxrwx 1 arul arul 338 20090522 19:43 kanchilug freelist chmod : change mode : changing file(s) permissions ( read, write, excute ) to users , groups , Others . History : arul@aruldesktop:~/klug$ history 1 <?xml version=quot;1.0quot;?> 2 <stickynotes version=quot;2.26.1quot;/> . . . 173 chmod o+rwx kanchilug emails & b' days 174 ls l 175 chmod 777 kanchilug freelist 176 ls l 177 history history helps to retrive past 500 commands excuted in terminal eventhough after shutdown many times. ( By default 500). we can change change the no of commands which will be store in history file . arul@aruldesktop:~/klug$ history > klug_history we can store all those commands history into a text file .
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