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Full Discussion: How to implement the counter in loop?
Top Forums Shell Programming and Scripting How to implement the counter in loop? Post 302647831 by bakunin on Tuesday 29th of May 2012 03:04:10 AM
Old 05-29-2012
You might want to read the man page of the shell you are using (and which you forgot to tell us), specifically the chapter about "Arithmetic Operations" or something such.

Use

Code:
typeset -i integervar=0

to declare a variable. Use

Code:
(( integervar += 1 ))

to increment the variable. Notice that "((" and "))" HAS TO HAVE a space char after/before it, otherwise it will not work as expected. In the following the first line is correct, the second is not:

Code:
(( integervar += 1 ))  # correct
((integervar += 1))    # WRONG!

I hope this helps.

bakunin
 

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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

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FILES

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	      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).

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