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Full Discussion: Linux Shell Script
Top Forums Shell Programming and Scripting Linux Shell Script Post 302286464 by pludi on Wednesday 11th of February 2009 08:41:09 AM
Old 02-11-2009
An example for an init script can be found at /etc/init.d/skeleton in most distributions.
As for the snapshot, create it first from the shell and modify /etc/fstab to boot from the snapshot instead of the usual partition. Then, in the init script, make sure that all required modules are loaded, remove the old snapshot using lvremove, and create it new, using the same command as on the command line.
A good intro to LVM can be found at The Linux Documentation Project
 

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service(8)						      System Manager's Manual							service(8)

NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start command. service --status-all runs all init scripts, in alphabetical order, with the status command. If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2. FILES
/etc/init.d The directory containing System V init scripts. ENVIRONMENT
LANG, TERM The only environment variables passed to the init scripts. SEE ALSO
chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5) Jan 2006 service(8)
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