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Top Forums Shell Programming and Scripting Understanding of a script as a scripting newbie Post 302353303 by sunpraveen on Tuesday 15th of September 2009 05:28:16 AM
Old 09-15-2009
Alex,

Code:
 
1. if [ ".$t" != . ]; then

The above is basically to check whether the variable $t is set or not. If it is indeed set to some value, then ".$t" will NOT be equal to "."

eg: if $t is set to a, then ".$t" will be equal to ".a".

Code:
2. if [ -s $status_out ]; then

-s file True if file exists and has a size greater than zero.

"man test" will give you more information.


Code:
3. if [ $t -ge $thresh_warn ]; then

The above is checking whether $t is greater than or equal to $thresh_warn and hence "-ge" option.

This is used for comparing numerals.


HTH,Smilie


Regards,

Praveen
 

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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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