Frequently Asked Questions About Linux / UNIX » shell scripts 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: SysVinit Services Restart vs Reload vs Condrestarthttp://www.cyberciti.biz/faq/linux-unix-sysvinit-services-restart-vs-reload-vs-condrestart/ http://www.cyberciti.biz/faq/linux-unix-sysvinit-services-restart-vs-reload-vs-condrestart/#comments Thu, 05 Jan 2012 21:24:25 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=11349 Can you tell me differences between the following sysvinit /sbin/service command:
service httpd restart service httpd condrestart service httpd reload
]]> http://www.cyberciti.biz/faq/linux-unix-sysvinit-services-restart-vs-reload-vs-condrestart/feed/ 0 Linux: What is Dash ( /bin/dash ) Shell?http://www.cyberciti.biz/faq/debian-ubuntu-linux-binbash-vs-bindash-vs-binshshell/ http://www.cyberciti.biz/faq/debian-ubuntu-linux-binbash-vs-bindash-vs-binshshell/#comments Sat, 28 May 2011 12:43:18 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10598 What is /bin/dash? I noticed that the default system shell /bin/sh was changed to /bin/dash. Why was this change made?]]> http://www.cyberciti.biz/faq/debian-ubuntu-linux-binbash-vs-bindash-vs-binshshell/feed/ 3 UNIX / Linux: Increment The Datehttp://www.cyberciti.biz/faq/increment-the-date/ http://www.cyberciti.biz/faq/increment-the-date/#comments Tue, 26 Apr 2011 21:16:27 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10450 I want to increment the date under UNIX or Linux operating system while writing shell scripts. For example Apr/27/2011 should be incremented as Apr/28/2011 and so on. How do I increment a date in UNIX or Linux shell?]]> http://www.cyberciti.biz/faq/increment-the-date/feed/ 1 Explains: echo Command (echo $”string”) Double-quoted String Preceded By a Dollar Signhttp://www.cyberciti.biz/faq/bash-localization-with-echo-command/ http://www.cyberciti.biz/faq/bash-localization-with-echo-command/#comments Fri, 22 Oct 2010 12:06:57 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9060 I noticed that many shell scripts in /etc/init.d/ directory use the following syntax:
echo $"Usage $prog start|stop|reload|restart"
Why a double-quoted string preceded by a dollar sign ($"string") using the echo command under Linux / UNIX bash scripts?]]> http://www.cyberciti.biz/faq/bash-localization-with-echo-command/feed/ 2 UNIX / Linux: Shell Scripting With mail Commandhttp://www.cyberciti.biz/faq/linux-unix-bash-ksh-csh-sendingfiles-mail-attachments/ http://www.cyberciti.biz/faq/linux-unix-bash-ksh-csh-sendingfiles-mail-attachments/#comments Sat, 02 Oct 2010 07:15:21 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8909 How do I send e-mails from a shell script including file attachments?]]> http://www.cyberciti.biz/faq/linux-unix-bash-ksh-csh-sendingfiles-mail-attachments/feed/ 3 Linux incrond inotify: Monitor Directories For Changes And Take Actionhttp://www.cyberciti.biz/faq/linux-inotify-examples-to-replicate-directories/ http://www.cyberciti.biz/faq/linux-inotify-examples-to-replicate-directories/#comments Sun, 18 Jul 2010 00:04:15 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8437 I want to copy (rsync to remote server) a directory tree whenever file uploaded or deleted in /var/www/html/upload/ directory under Linux operating systems for backup purpose and/or load balancing purpose without getting into complex file sharing setup such as NFS or GFS iscsi storage. How do I monitor /var/www/html/upload/ and its subdirectory for new files and executes rsync command to make copy back to www2.example.com:/var/www/html/upload/?]]> http://www.cyberciti.biz/faq/linux-inotify-examples-to-replicate-directories/feed/ 20 HowTo: Use cat Command In Linux / UNIXhttp://www.cyberciti.biz/faq/howto-use-cat-command-in-unix-linux-shell-script/ http://www.cyberciti.biz/faq/howto-use-cat-command-in-unix-linux-shell-script/#comments Tue, 09 Feb 2010 20:44:41 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9987 How do I use cat command in Linux? How do I use cat command in UNIX? How can I use cat command in UNIX or Linux shell scripts?]]> http://www.cyberciti.biz/faq/howto-use-cat-command-in-unix-linux-shell-script/feed/ 2 Iptables: Invert IP, Protocol, Or Interface Test With !http://www.cyberciti.biz/faq/iptables-invert-ip-or-protocol-with/ http://www.cyberciti.biz/faq/iptables-invert-ip-or-protocol-with/#comments Fri, 29 Jan 2010 08:05:20 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=6339 How do I invert a protocol or ip address test while writing iptables based shell scripts?]]> http://www.cyberciti.biz/faq/iptables-invert-ip-or-protocol-with/feed/ 3 How To Use awk In Bash Scriptinghttp://www.cyberciti.biz/faq/bash-scripting-using-awk/ http://www.cyberciti.biz/faq/bash-scripting-using-awk/#comments Sat, 15 Aug 2009 18:53:53 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=4779 How do I use awk pattern scanning and processing language under bash scripts? Can you provide a few examples?]]> http://www.cyberciti.biz/faq/bash-scripting-using-awk/feed/ 22 Applescript: Run or Call a Shell Scripthttp://www.cyberciti.biz/faq/mac-osx-applescript-run-shell-script/ http://www.cyberciti.biz/faq/mac-osx-applescript-run-shell-script/#comments Mon, 26 Jan 2009 20:28:49 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=5511 How do run a a shell script with an AppleScript? How do I integrate shell scripts into AppleScript? How do I call a shell script called /path/to/chkhost.sh using an applescript?]]> http://www.cyberciti.biz/faq/mac-osx-applescript-run-shell-script/feed/ 3 sshpass: Login To SSH Server / Provide SSH Password Using A Shell Scripthttp://www.cyberciti.biz/faq/noninteractive-shell-script-ssh-password-provider/ http://www.cyberciti.biz/faq/noninteractive-shell-script-ssh-password-provider/#comments Fri, 12 Sep 2008 09:04:32 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1732 Q. How do I login over ssh without using password less RSA / DSA public keys? How do I use ssh in a shell script? How do I login non-interactivly performing password authentication with SSH and shell scripts?]]> http://www.cyberciti.biz/faq/noninteractive-shell-script-ssh-password-provider/feed/ 19 Understanding Linux / UNIX tr commandhttp://www.cyberciti.biz/faq/how-to-use-linux-unix-tr-command/ http://www.cyberciti.biz/faq/how-to-use-linux-unix-tr-command/#comments Sun, 23 Dec 2007 11:05:48 +0000 Vivek Gite http://www.cyberciti.biz/faq/how-to-use-linux-unix-tr-command/ http://www.cyberciti.biz/faq/how-to-use-linux-unix-tr-command/feed/ 18 Howto: Backup CentOS / Fedora Linux / Red Hat Enterprise Linux server systemhttp://www.cyberciti.biz/faq/rhel-backup-linux-server/ http://www.cyberciti.biz/faq/rhel-backup-linux-server/#comments Thu, 26 Jul 2007 01:35:58 +0000 Vivek Gite http://www.cyberciti.biz/faq/rhel-backup-linux-server/ http://www.cyberciti.biz/faq/rhel-backup-linux-server/feed/ 1 Email multiple file attachment from Solairs / AIX / HP-UX UNIX/ Linux command linehttp://www.cyberciti.biz/faq/howto-unix-sending-files-as-mail-attachments/ http://www.cyberciti.biz/faq/howto-unix-sending-files-as-mail-attachments/#comments Wed, 25 Apr 2007 13:13:26 +0000 Vivek Gite http://www.cyberciti.biz/faq/howto-unix-sending-files-as-mail-attachments/ http://www.cyberciti.biz/faq/howto-unix-sending-files-as-mail-attachments/feed/ 20 Bash Script Replace Empty Spaces Stringhttp://www.cyberciti.biz/faq/bash-script-replace-spaces-string/ http://www.cyberciti.biz/faq/bash-script-replace-spaces-string/#comments Mon, 14 Aug 2006 11:27:35 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=4771 How do I remove all spaces from string using shell scripts? I've var="This is a test", and I'd like to remove all spaces.]]> http://www.cyberciti.biz/faq/bash-script-replace-spaces-string/feed/ 6 What is UNIX / Linux C Shell?http://www.cyberciti.biz/faq/what-is-unix-linux-c-shell/ http://www.cyberciti.biz/faq/what-is-unix-linux-c-shell/#comments Sat, 17 Jun 2006 00:35:16 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=4087 What is C shell under UNIX / Linux operating systems?]]> http://www.cyberciti.biz/faq/what-is-unix-linux-c-shell/feed/ 0 What is The Role Of the System Administrator?http://www.cyberciti.biz/faq/what-is-the-role-of-the-system-administrator/ http://www.cyberciti.biz/faq/what-is-the-role-of-the-system-administrator/#comments Mon, 20 Feb 2006 20:09:00 +0000 Vivek Gite http://www.cyberciti.biz/faq/faq/what-is-the-role-of-the-system-administrator.php http://www.cyberciti.biz/faq/what-is-the-role-of-the-system-administrator/feed/ 333