Frequently Asked Questions About Linux / UNIX » BASH Shell http://www.cyberciti.biz/faq Every answer asks a more beautiful question. Fri, 03 Feb 2012 22:38:32 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Linux / Unix Shell: Set Default Printerhttp://www.cyberciti.biz/faq/howto-set-default-printer-bash-ksh-csh-unix-linux-shell/ http://www.cyberciti.biz/faq/howto-set-default-printer-bash-ksh-csh-unix-linux-shell/#comments Sun, 29 Jan 2012 22:42:02 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=11483 How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?]]> http://www.cyberciti.biz/faq/howto-set-default-printer-bash-ksh-csh-unix-linux-shell/feed/ 0 Bash Shell: Find Out If a Variable Is Set or Nothttp://www.cyberciti.biz/faq/linux-unix-howto-check-if-bash-variable-defined-not/ http://www.cyberciti.biz/faq/linux-unix-howto-check-if-bash-variable-defined-not/#comments Sun, 25 Sep 2011 10:34:33 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=11132 How do I check if a bash shell variable called $input is defined or not under BSD / Apple OS X / Unix / Linux like operating systems?]]> http://www.cyberciti.biz/faq/linux-unix-howto-check-if-bash-variable-defined-not/feed/ 1 UNIX: Lynx Browser Set / Change the Default Home Pagehttp://www.cyberciti.biz/faq/linux-bsd-appleosx-unix-lynx-browser-change-startup-page/ http://www.cyberciti.biz/faq/linux-bsd-appleosx-unix-lynx-browser-change-startup-page/#comments Mon, 25 Apr 2011 13:22:54 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10414 How do I change the default home page with Lynx browser under UNIX or Linux operating system? How do I set the startup page to http://google.co.uk with Lynx?]]> http://www.cyberciti.biz/faq/linux-bsd-appleosx-unix-lynx-browser-change-startup-page/feed/ 0 HowTo: Linux Random Password Generator Commandhttp://www.cyberciti.biz/faq/linux-random-password-generator/ http://www.cyberciti.biz/faq/linux-random-password-generator/#comments Fri, 18 Feb 2011 17:43:26 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10064 How do I generate random passwords on the Linux command line using the bash shell?]]> http://www.cyberciti.biz/faq/linux-random-password-generator/feed/ 6 Bash Shell: Extract Digits From a Stringhttp://www.cyberciti.biz/faq/linux-unix-bsd-shell-script-to-get-digits-from-string/ http://www.cyberciti.biz/faq/linux-unix-bsd-shell-script-to-get-digits-from-string/#comments Wed, 16 Feb 2011 10:56:41 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10040 How do I extract digits only from a given string under Bash shell?]]> http://www.cyberciti.biz/faq/linux-unix-bsd-shell-script-to-get-digits-from-string/feed/ 9 UNIX: Read a File Line By Linehttp://www.cyberciti.biz/faq/unix-howto-read-line-by-line-from-file/ http://www.cyberciti.biz/faq/unix-howto-read-line-by-line-from-file/#comments Wed, 26 Jan 2011 14:12:18 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9835 How do I read a file line by line under UNIX using KSH or BASH shell?]]> http://www.cyberciti.biz/faq/unix-howto-read-line-by-line-from-file/feed/ 2 Linux: Find Out My Group Name [ Group Memberships ]http://www.cyberciti.biz/faq/howto-get-group-name-in-linux/ http://www.cyberciti.biz/faq/howto-get-group-name-in-linux/#comments Fri, 21 Jan 2011 19:31:59 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9813 How do I find out the group name under Linux operating systems using bash shell prompt? How do I display group information for the specified USERNAME under Linux?]]> http://www.cyberciti.biz/faq/howto-get-group-name-in-linux/feed/ 1 Linux / UNIX: Run Commands When You Log Outhttp://www.cyberciti.biz/faq/linux-unix-run-commands-when-you-log-out/ http://www.cyberciti.biz/faq/linux-unix-run-commands-when-you-log-out/#comments Tue, 23 Nov 2010 11:32:13 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9475 I've written a Perl script that connects to our central server for me and it allows me feed data so that I make a timesheet later. How do I run my script when I log out from Apple OS X or Linux / UNIX workstation using bash shell?]]> http://www.cyberciti.biz/faq/linux-unix-run-commands-when-you-log-out/feed/ 0 Linux: Bash Get Timehttp://www.cyberciti.biz/faq/unix-linux-bash-get-time/ http://www.cyberciti.biz/faq/unix-linux-bash-get-time/#comments Wed, 27 Oct 2010 11:25:23 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9159 How do I get the system time in BASH? How can I get the Linux system using bash shell?]]> http://www.cyberciti.biz/faq/unix-linux-bash-get-time/feed/ 1 Debian Linux Delete Directory Commandhttp://www.cyberciti.biz/faq/debian-delete-directory/ http://www.cyberciti.biz/faq/debian-delete-directory/#comments Thu, 19 Aug 2010 21:14:16 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9781 I am new to Debian Linux and bash shell command line. How do I delete or remove a directory using bash prompt?]]> http://www.cyberciti.biz/faq/debian-delete-directory/feed/ 0 UNIX Source Command: Read And Execute Commands From Filehttp://www.cyberciti.biz/faq/unix-source-command/ http://www.cyberciti.biz/faq/unix-source-command/#comments Sun, 08 Aug 2010 14:13:20 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8590 What is the use of UNIX source command under bash or any other shell? How do I use source command under UNIX / OS X / Linux operating systems?]]> http://www.cyberciti.biz/faq/unix-source-command/feed/ 3 Bash Shell Generate Random Numbershttp://www.cyberciti.biz/faq/bash-shell-script-generating-random-numbers/ http://www.cyberciti.biz/faq/bash-shell-script-generating-random-numbers/#comments Tue, 27 Apr 2010 18:28:32 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=7257 How do I create or generate random numbers (sequence of numbers that lack any pattern), under Bash shell?]]> http://www.cyberciti.biz/faq/bash-shell-script-generating-random-numbers/feed/ 7 UNIX / Linux: Kill All My Jobs Under Current Shell Sessionhttp://www.cyberciti.biz/faq/linux-unix-appleosx-bsd-kill-all-jobs-under-bash-ksh-sh-shell/ http://www.cyberciti.biz/faq/linux-unix-appleosx-bsd-kill-all-jobs-under-bash-ksh-sh-shell/#comments Sun, 25 Apr 2010 13:49:39 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10425 How do I kill all the UNIX jobs I created under my current login shell such as Bash or KSH before logout?]]> http://www.cyberciti.biz/faq/linux-unix-appleosx-bsd-kill-all-jobs-under-bash-ksh-sh-shell/feed/ 0 Bash Shell Read a Line Field By Fieldhttp://www.cyberciti.biz/faq/bash-shell-read-a-line-field-by-field/ http://www.cyberciti.biz/faq/bash-shell-read-a-line-field-by-field/#comments Sun, 14 Mar 2010 15:47:04 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=6801 How do I read a file field-by-field under UNIX / Linux / BSD Bash shell? My sample input data file is as follows:

device1,deviceType,major,minor,permissions
device2,deviceType,major,minor,permissions
...
....
..
deviceN,deviceTypeN,major,minor,permissions


For each line I need to construct and execute a shell command as follows:

/path/to/deviceMaker --context=$1 -m $permissions $device2 $deviceType $major $minor
]]> http://www.cyberciti.biz/faq/bash-shell-read-a-line-field-by-field/feed/ 5 Bash Shell: Convert Tabs To Spaces In a Filehttp://www.cyberciti.biz/faq/bash-shell-convert-tabs-to-spaces-in-a-file/ http://www.cyberciti.biz/faq/bash-shell-convert-tabs-to-spaces-in-a-file/#comments Fri, 05 Mar 2010 11:43:11 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=6661 How do convert tabs to spaces in a file using a bash shell?]]> http://www.cyberciti.biz/faq/bash-shell-convert-tabs-to-spaces-in-a-file/feed/ 4 HowTo: Linux Rename Fileshttp://www.cyberciti.biz/faq/howto-rename-files-in-linux/ http://www.cyberciti.biz/faq/howto-rename-files-in-linux/#comments Mon, 15 Feb 2010 12:47:39 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10027 How do I rename a file under Linux operating systems using command line (bash shell prompt)?]]> http://www.cyberciti.biz/faq/howto-rename-files-in-linux/feed/ 0 Linux: Howto Make a Directory Commandhttp://www.cyberciti.biz/faq/linux-make-directory-command/ http://www.cyberciti.biz/faq/linux-make-directory-command/#comments Wed, 10 Feb 2010 08:51:54 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9999 How do I make directory under Linux operating systems using the command prompt (bash shell)?]]> http://www.cyberciti.biz/faq/linux-make-directory-command/feed/ 0 Linux: Change the PATH [ Add New Directory ]http://www.cyberciti.biz/faq/bash-linux-change-path-variable-etc-byediting-profile-bash_profile/ http://www.cyberciti.biz/faq/bash-linux-change-path-variable-etc-byediting-profile-bash_profile/#comments Mon, 01 Feb 2010 11:02:02 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9892 How do I change the PATH settings under Linux operating systems and add a new directory to $PATH under bash shell?]]> http://www.cyberciti.biz/faq/bash-linux-change-path-variable-etc-byediting-profile-bash_profile/feed/ 0 Linux: Parse an IP Addresshttp://www.cyberciti.biz/faq/linux-parse-ip-address/ http://www.cyberciti.biz/faq/linux-parse-ip-address/#comments Thu, 28 Jan 2010 16:53:52 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9857 How do I parse my Linux servers IP address using a Bash shell?]]> http://www.cyberciti.biz/faq/linux-parse-ip-address/feed/ 0 Redhat Linux: Find Out My IP Addresshttp://www.cyberciti.biz/faq/howto-find-ip-address-on-centos-fedora-redhat-enterprise-linux/ http://www.cyberciti.biz/faq/howto-find-ip-address-on-centos-fedora-redhat-enterprise-linux/#comments Thu, 21 Jan 2010 19:46:34 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9819 How do I to find out ip address on a CentOS or Fedora or Redhat Enterprise Linux server or desktop system using bash shell or command line options?]]> http://www.cyberciti.biz/faq/howto-find-ip-address-on-centos-fedora-redhat-enterprise-linux/feed/ 1