Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Variable scope in bash
Top Forums Shell Programming and Scripting Variable scope in bash Post 302589306 by haaru on Wednesday 11th of January 2012 09:03:38 AM
Old 01-11-2012
Variable scope in bash
Hello! Before you "bash" me with
- Not another post of this kind
Please read on and you will understand my problem...

I am using the below to extract a sum of the diskIO on a Solaris server.

Code:
#!/bin/sh
PATH=/usr/bin:/usr/sbin:/sbin; export PATH
TEMP1="/tmp/raw-sar-output.txt$$"
TEMP2="/tmp/sorted-sar-output.txt$$"
CONT=0
sar -d 30 4 > $TEMP1
AVG_START=`awk '/^Average/ {print NR}' $TEMP1`
TOT_LINES=`cat $TEMP1 |wc -l`
TAIL_LINES=`expr $TOT_LINES - $AVG_START`
tail -$TAIL_LINES $TEMP1 | awk '{ print $5,$2 }' | sort -k 1n,1 > $TEMP2
if [ -s "$TEMP2" ]
then
   while read file;
   do
      IO=`echo $file | awk '{ print $1 }'`
      TMP_VAL=`echo $file | awk '{ print $1 }'`
      CONT=`expr $CONT + $TMP_VAL`
   echo CONT = $CONT
   done < $TEMP2
   #Echo Result
   echo $CONT
else
   rm -f $TEMP1 $TEMP2 2>/dev/null
   exit 1
fi
rm -f $TEMP1 $TEMP2 2>/dev/null
exit 0

Even though I am not piping to while, the final
Code:
echo $CONT

returns zero.

The same code with Korn shell works perfectly but for some reason the execution is too slow and causes problems to the use I need it for. So I definately need to use Bash or something equally fast...

Please help!
This User Gave Thanks to haaru For This Post:
drbiloukos
 

10 More Discussions You Might Find Interesting

1. Programming

C++ variable scope and mutexes

I've been wondering if I can make mutexes much easier to use in C++ with creative use of a locking class and variable scope, but I'm not sure if things happen in the order I want. Here's pseudocode for something that could use the class: int someclass::getvalue() { int retval; ... (0 Replies)
Discussion started by: Corona688
0 Replies

2. Shell Programming and Scripting

problem with shell variable's scope

Hi, I am stuck while developing a shell sub-routine which checks the log file for "success" or "failure". The subroutine reads the log file and checks for key word "success", if found it set the variable (found=1). It returns success or failure based on this variable. My problem is, I can... (2 Replies)
Discussion started by: cjjoy
2 Replies

3. Shell Programming and Scripting

scope of the variable - Naga

Hi All, I am new to unix shell scripting, in the below script "num" is an input file which contains a series of numbers example : 2 3 5 8 I want to add the above all numbers and want the result finally outside the while loop. it prints the value zero instead of the actual expected... (13 Replies)
Discussion started by: nagnatar
13 Replies

4. Shell Programming and Scripting

variable scope

Hi, I want to know about the variable scope in shell script. How can we use the script argument inside the function? fn () { echo $1 ## I want this argument should be the main script argument and not the funtion argument. } also are there any local,global types in shell script? if... (3 Replies)
Discussion started by: shellwell
3 Replies

5. UNIX for Dummies Questions & Answers

Bash loops and variable scope

Hi All, I've been researching this problem and I am pretty sure that the issue is related to the while loop and the piping. There are plenty of other threads about this issue that recommend removing the pipe and using redirection. However, I haven't been able to get it working using the ssh and... (1 Reply)
Discussion started by: 1skydive
1 Replies

6. Shell Programming and Scripting

Help with retaining variable scope

Hi, I use Korn Shell. Searched Forum and modified the way the file is input to the while loop, but still the variable does not seem to be retaining the final count. while read name do Tmp=`echo $name | awk '{print $9 }'` Count=`cat $Tmp | wc -l`... (6 Replies)
Discussion started by: justchill
6 Replies

7. Shell Programming and Scripting

Maintain Scope of the variable in UNIX

Hi All Is there is any way to maintain the scope of the variable in unix Example x=1 j=1 while do .. .... .... while do .. .. x=x+1 done #inner most while loop ends here done #outer loop ends here (8 Replies)
Discussion started by: parthmittal2007
8 Replies

8. Shell Programming and Scripting

BASH: variable and function scope and subscripts

Hi, I'm a Delphi developer new to linux, new to this forums and new to BASH programming and got a new task in my work: maintaining an existing set of BASH scripts. First thing I want to do is making the code more reliable as in my opinion it's really bad written. So here's the quest: I'm... (6 Replies)
Discussion started by: rse
6 Replies

9. Programming

Variable Scope in Perl

I have to admit that i have not used Perl at all and this is a singular occasion where i have to patch an existing Perl script. I dearly hope i do not have to do it again for the next 15 years and therefore try to avoid having to learn the programming language in earnest. The OS is AIX 7.1, the... (2 Replies)
Discussion started by: bakunin
2 Replies

10. UNIX for Beginners Questions & Answers

Bash Variable scope - while loop while reading from a file

Cope sample1: test.sh i=0 echo " Outside loop i = $i " while do i=$(( $i + 1)) echo "Inside loop i = $i " done echo " Out of loop i is : $i " When run output : Outside loop i = 0 Inside loop i = 1 Inside loop i = 2 Inside loop i = 3 Inside loop i = 4 Inside loop i = 5 Inside... (8 Replies)
Discussion started by: Adarshreddy01
8 Replies

LEARN ABOUT DEBIAN

msvc

msvc(8) 						      System Manager's Manual							   msvc(8)

NAME

       msvc - control minit

SYNOPSIS

       msvc [ -[uodpchaitko] ] [ -P pid ] service [...]

DESCRIPTION

       msvc  is the management interface to minit.  service is the service directory name relative to /etc/minit.  Starting with minit 0.9 you can
       also include /etc/minit/ in the service name.

OPTIONS

       If no option is given, msvc will just print a small diagnostic message to stdout, saying if the service is up, down or finished, which  PID
       it has if it is up, and for how long it has been in this state.

       -u   Up.  If the service is not running, start it.  If the service stops, restart it.

       -o   Once.  If the service is not running, start it.  If the service stops, do not restart it.

       -d   Down.  If the service is running, send it a TERM signal and then a CONT signal.  After it stops, do not restart it.

       -p   Pause.  Send the service a STOP signal.

       -c   Continue.  Send the service a CONT signal.

       -h   Hangup.  Send the service a HUP signal.

       -a   Alarm.  Send the service an ALRM signal.

       -i   Interrupt.	Send the service an INT signal.

       -t   Terminate.	Send the service a TERM signal.

       -k   Terminate.	Send the service a KILL signal.

       -P pid
	    Set PID.  Tell minit the PID of the service is really pid.	This is useful for services that fork themselves in the background but put
	    their real PID in a file, typically called /var/run/service.pid.  Used by pidfilehack.

       -D service
	    Print dependencies.  This will print all the names of all the services that were started  because  this  services  depended  on  them.
	    Please  note  that this is not done recursively (i.e. if default depends on qmail and qmail depends on log, this will print qmail, not
	    qmail/log.	But msvc -D qmail will print qmail/log).

       -H   Print history.  This will print the names of the ten least recently spawned processes.  This is useful if you see  a  process  looping
	    (initialization fails and minit is restarting it all the time).

RETURN CODES

       Generally,  msvc  return zero if everything is OK or 1 on error (could not open /lib/minit/in or /lib/minit/out or there is no process with
       the given name).  In diagnostic mode, it will exit 0 if the service is up, 2 if it is down or 3 if it is finished.

SEE ALSO

       pidfilehack(8), svc(8)

																	   msvc(8)
All times are GMT -4. The time now is 01:29 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy