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Full Discussion: setting a global variable in script
Top Forums UNIX for Dummies Questions & Answers setting a global variable in script Post 302141868 by porter on Tuesday 23rd of October 2007 05:32:28 AM
Old 10-23-2007
Quote:
Originally Posted by arunkumar_mca
Is there is way to share a variable between scripts?
Variables, or rather environment variables, belong to processes, not scripts, scripts change them but they exist with the process.

If you execute a script with "#!/bin/sh" it starts a new process to run the script in, hence a new set of environment variables, children will inherit the parent's exported variables but not the other way round.

The alternative is to run a script using "source" or ".". The down side of this is the script language has to be the same and the error handling must be consistent.
 

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LEARN ABOUT XFREE86

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 or systemd unit 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, or the name of a systemd unit.  The  existence  of  a
       systemd unit of the same name as a script in /etc/init.d will cause the unit to take precedence over the init.d script.	The supported val-
       ues of COMMAND depend on the invoked script. service passes COMMAND  and OPTIONS to the init script unmodified. For systemd  units,  start,
       stop, status, and reload are passed through to their systemctl/initctl equivalents.

       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. The status is [ + ] for running services, [ - ]
       for stopped services and [ ? ] for services without a status command.  This option only calls status for sysvinit jobs.

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.

       /{lib,run,etc}/systemd/system
	      The directories containing systemd units.

ENVIRONMENT

       LANG,  LANGUAGE,  LC_CTYPE, LC_NUMERIC, LC_TIME, LC_COLLATE, LC_MONETARY, LC_MESSAGES, LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEA-
       SUREMENT, LC_IDENTIFICATION, LC_ALL, TERM, PATH
	      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)
       systemctl(1)

AUTHOR

       Miloslav Trmac <mitr@redhat.com>, Petter Reinholdtsen <pere@hungry.com>

       Licence: GNU Public Licence v2 (GPLv2)

COPYRIGHT

       2006 Red Hat, Inc.,  Petter Reinholdtsen <pere@hungry.com>

Jan 206 																SERVICE(8)
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