- & – which means execute the first as well as the next
- && – which means execute the next command only if the before command is successful
- Simply use cd ~
[shell_test@localhost tmp]$ pwd
/tmp
[shell_test@localhost tmp]$ cd ~
[shell_test@localhost ~]$ pwd
/home/shell_test
[shell_test@localhost ~]$
& , && – when ever you need to compile two or more files you can use these to execute them.
Locate files on computer
-
First run updatedb as super user(su) or sudo and use locate command to find the file and file names. You can also use find to find files.
Go to your home directory even in any directory?
-
Navigate to parent directory using
-
Navigate to just one directory above cd ..
[shell_test@localhost test3]$ pwd
/tmp/test1/test2/test3
[shell_test@localhost test3]$ cd ..
[shell_test@localhost test2]$ pwd
/tmp/test1/test2
[shell_test@localhost test2]$ -
Navigate to 2 directories above cd ../..
[shell_test@localhost test2]$ pwd
/tmp/test1/test2
[shell_test@localhost test2]$ cd ../..
[shell_test@localhost tmp]$ pwd
/tmp
[shell_test@localhost tmp]$
-
Run resume paused command or run commands simultaneously or run commands one after the other
- Pause a command ctrl+z the command will be paused next run command in back ground using bg :
[root@localhost shell_test]# updatedb
^Z
[1]+ Stopped updatedb
[root@localhost shell_test]# bg
[1]+ updatedb &
[root@localhost shell_test]#
Even you can resume command in foreground by using fg in the similar way but I feel bg(back ground) is a better option. -
Run command in back ground :
[root@localhost shell_test]# updatedb &
[1] 2907
[root@localhost shell_test]#
[1]+ Done updatedb
[root@localhost shell_test]# - Execute two independent commands simultaneously
[root@localhost shell_test]# ls & cd /tmp
[1] 2909
[root@localhost tmp]# Desktop Download Music Public Videos
Documents listoffiles Pictures Templates - Execute command one after other : this execution happens only if the previous command is successful
- success full commands
[root@localhost tmp]# ls -l && cd ~
total 19820
-rw-rw-r–. 1 gpvprasad gpvprasad 6 2009-11-18 06:18 blueman-applet-500
-rw-rw-r–. 1 shell_test shell_test 6 2009-11-14 09:58 blueman-applet-501
-rw-r–r–. 1 root root 55501 2009-11-08 20:15 firstbootX.log
-rw——-. 1 gpvprasad gpvprasad 9575970 2009-11-10 13:57 FlashTq8VPV
-rw——-. 1 gpvprasad gpvprasad 60110 2009-11-16 07:03 FlashX3BRGH
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:25 kde-gpvprasad
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 21:59 keyring-1jzdcI
drwx——. 2 shell_test shell_test 4096 2009-11-11 07:53 keyring-67Zz4c
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:18 keyring-iBwaSe
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-11 20:59 keyring-oxgV2D
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-11 07:21 keyring-RV8dci
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 19:05 keyring-xfs7bJ
-rw-r–r–. 1 root root 710 2009-11-14 12:00 last-queue.yumex
-rw——-. 1 gpvprasad gpvprasad 4830557 2009-11-12 18:57 moz-screenshot-1.png
-rw——-. 1 gpvprasad gpvprasad 4830557 2009-11-12 18:57 moz-screenshot.png
drwx——. 2 gdm gdm 4096 2009-11-18 06:18 orbit-gdm
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:25 orbit-gpvprasad
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 19:08 plugtmp
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:30 plugtmp-1
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:18 pulse-NHMkC8Hpqptl
drwx——. 2 shell_test shell_test 4096 2009-11-14 09:58 pulse-o35KrWjV2fET
drwx——. 2 gdm gdm 4096 2009-11-18 06:18 pulse-Q53w5sDZdexN
srw——-. 1 gpvprasad gpvprasad 0 2009-11-14 12:18 scim-panel-socket:0-gpvprasad
drwxrwxr-x. 2 shell_test shell_test 4096 2009-11-14 09:57 test
drwxrwxr-x. 3 shell_test shell_test 4096 2009-11-16 21:27 test1
drwx——. 2 root root 4096 2009-11-08 16:59 tmpBJxaAz
-rw——-. 1 shell_test shell_test 653006 2009-11-11 06:43 tmp.xpi
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 20:15 virtual-gpvprasad.0aW2bl
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-14 06:35 virtual-gpvprasad.38DNpf
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 19:18 virtual-gpvprasad.3tCwjI
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-11 20:59 virtual-gpvprasad.3vq7xC
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-11 20:03 virtual-gpvprasad.CsY5M2
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-17 19:08 virtual-gpvprasad.cYH3ne
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-13 17:19 virtual-gpvprasad.dpxCk1
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-14 11:47 virtual-gpvprasad.dx7aGu
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-14 11:48 virtual-gpvprasad.EG7NVU
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-14 11:03 virtual-gpvprasad.eQBt59
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-14 11:57 virtual-gpvprasad.Hfnqm6
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-12 17:35 virtual-gpvprasad.hgVw00
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-09 07:48 virtual-gpvprasad.Hq4adE
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-18 06:18 virtual-gpvprasad.IrfHxg
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-16 20:54 virtual-gpvprasad.jLPLlV
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-17 20:45 virtual-gpvprasad.JzoEr5
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-12 22:22 virtual-gpvprasad.K0hGCt
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-12 06:46 virtual-gpvprasad.Ku2mDH
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-15 09:48 virtual-gpvprasad.Kx9K06
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-15 22:49 virtual-gpvprasad.LWQFHp
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 21:59 virtual-gpvprasad.NV5HWF
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-17 06:49 virtual-gpvprasad.o4VX1a
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-16 06:53 virtual-gpvprasad.Q492oZ
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-09 06:30 virtual-gpvprasad.RH1v6Q
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-08 19:05 virtual-gpvprasad.rhyIbp
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-13 22:56 virtual-gpvprasad.uMhEPY
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-12 07:56 virtual-gpvprasad.WtYYZd
drwx——. 2 gpvprasad gpvprasad 4096 2009-11-11 07:21 virtual-gpvprasad.ZONzNq
drwx——. 2 shell_test shell_test 4096 2009-11-11 06:46 virtual-shell_test.3qeGZ9
drwx——. 2 shell_test shell_test 4096 2009-11-11 06:22 virtual-shell_test.mVCcs8
drwx——. 2 shell_test shell_test 4096 2009-11-14 09:58 virtual-shell_test.Rf9MYh
drwx——. 2 shell_test shell_test 4096 2009-11-09 06:29 virtual-shell_test.xfMz0U
-rw——-. 1 root root 61440 2009-11-08 17:49 whatis.wfiuSW
-rw-r–r–. 1 root root 0 2009-11-08 12:06 yum.log
[root@localhost ~]# - This example first command is a failure hence second command is never executed.
[root@localhost ~]# cd /tmp/test20 && ls -l
bash: cd: /tmp/test20: No such file or directory
[root@localhost ~]#
- success full commands
