goto statement Post: 302107775

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Top Forums Shell Programming and Scripting goto statement Post 302107775 by sb008 on Tuesday 20th of February 2007 03:27:51 PM

02-20-2007

Registered User

Quote:

Originally Posted by Krrishv

I have a test script for using goto statement but its not working. please help

i tried both in linux and hp-ux it's not working please help

#! /bin/ksh
t=`ps -ef|grep ti.sh|grep -v grep`
if [ $? -eq 0 ]; then
goto start
else
goto stop
fi
start:
echo "start"
stop:
echo "stop"

With all respect, a goto statement is for those who cannot program. It is a "dirty" way to jump from 1 place in the code to another.

As already mentioned, a goto statement doesnt exist in a Korn Shell.

Instead you could define 2 functions.

Code:

#! /bin/ksh

start()
{
  echo "start"
}

stop()
{
  echo "stop"
}

t=`ps -ef|grep t[i].sh`
if [ $? -eq 0 ]
then
  start
else
  stop
fi

By putting "[]" around 1 letter of the search pattern in the grep command there is no more need for the "grep -v grep" command.

The "grep -v grep" was wrong in this scenario anyway.
Because when you check for the return code "$?", you actually check the return code of the command "grep -v grep" and not of the command "grep ti.sh".

sb008

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LEARN ABOUT NETBSD

zfgrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD

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