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Top Forums Shell Programming and Scripting Executing scripts in Parallel Post 302203059 by itsme_maverick on Friday 6th of June 2008 11:23:47 AM
Old 06-06-2008
Quote:
Originally Posted by fabtagon
simple polling approach (this master script itself may not run parallel, vulnerable to symlink attacks through unsafe tmp file creation, ...)
Code:
#!/bin/bash
# should work in most shells
(script1; echo $? > /tmp/retval1 ) &
script2
# both do now run in parallel
# ...
# well, after some time script2 will have finished, so well have to check whether 2 also has
retval2=$?
while [ $? -eq 0 ]
do
  sleep 1s
  pidof script1 > /dev/null
done
retval1=`cat /tmp/retval1`
if [ something about retval1 and retval2 ]
then
  script3
fi


What does the line in "while loop" do ? pidof script1 > /dev/null
 

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SAFE_ASTERISK(8)					     Linux Programmer's Manual						  SAFE_ASTERISK(8)

NAME
safe_asterisk -- A wrapper to run the asterisk executable in a loop SYNOPSIS
safe_asterisk [ asterisk_params ] DESCRIPTION
safe_asterisk is a script that runs asterisk in a loop, which can be useful if you fear asterisk may crash. The script does not run in the background like a standard service. Rather, it runs in its own linux virtual console (9, by default). It also uses the option '-c' of asterisk(8) to avoid detaching asterisk from that terminal. safe_asterisk also runs asterisk with unlimited core file size, and thus asterisk will dump core in case of a crash. To get a "picture" of console 9, from another terminal (e.g: from a remote shell session) you can use: screendump 9 The init script of the Debian package should be able to run safe_asterisk as the asterisk service, if so configured. See coments in /etc/default/asterisk FILES
/tmp safe_asterisk runs in that directory, rather than in / as usual. /tmp/core If core files were generated there, they may be /etc/asterisk/startup.d Files in this directory will be 'source'd by the safe_asterisk script before it starts Asterisk proper, allowing them to set addi- tional environment variables or run any other steps that are needed for your system. BUGS
While showing the output on a console is useful, using screen(1) as the terminal may be better. The script does not read configuration from standard location under /etc It uses fixed locations under /tmp , and thus may be exposed to a symlink attacks. SEE ALSO
asterisk(8), screendump(9) AUTHOR
This manual page was written by Tzafrir Cohen <tzafrir.cohen@xorcom.com> Permission is granted to copy, distribute and/or modify this docu- ment under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2. Asterisk Jun 30th, 2005 SAFE_ASTERISK(8)
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