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Full Discussion: replacing a script while running
Top Forums Shell Programming and Scripting replacing a script while running Post 302264099 by chebarbudo on Wednesday 3rd of December 2008 06:06:34 AM
Old 12-03-2008
Question replacing a script while running
Hi there,

How can I run a script being sure that it runs all the way to the end even if the source file is deleted or replaced while running?
Actually, I have a script that runs daily on several servers. It replaces local files by updates from a master server. But I'd like it to replace itself too if an update is found on the master server.

Here is an example of what happens if a script is replaced while running:
Code:
~# cat script
echo statement 1
cp $0.update $0
echo statement 2
~# cat script.update
echo statement 3
cp $0.update $0
echo statement 4
~# bash script
statement 1
statement 4

How can I make sure the script runs entirely even if replaced while running?
1) The replacement file should not run immediately, this update will run the next day.
2) I would prefer not to have to create temporary files.
3) Although it would be a simple solution, it's hard for me to wait until the end of the script to do the replacement because other tasks run after files are updated.

Thanks in advance
Santiago
 

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LEARN ABOUT DEBIAN

service

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 an environment as possible, removing most environment variables and with the 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 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  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

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

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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