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Full Discussion: Adding Variables
Top Forums Shell Programming and Scripting Adding Variables Post 302455341 by mikem22 on Tuesday 21st of September 2010 10:00:12 AM
Old 09-21-2010
Adding Variables
Hi.

I have a for loop that I use to extract integer values in a shell script (ksh). Now, I would like to add the values. My preference, from my c programming days, would be to do something like the commented out line below in the for loop. However, this is not recognised. So I use the line shown (TOTALWORK=$TOTALWORK+$WORKDONE) but this is concatenating the values (See output below).

Code:
    let WORKDONE=0
    let TOTALWORK=0

    # calculate the total work done
    for WORKDONE in `grep "Records to Delete" ${LOGFILE}|cut -d':' -f5|cut -d' ' -f2`
    do
        #TOTALWORK+=$WORKDONE
        TOTALWORK=$TOTALWORK+$WORKDONE
    done

The output is:

Code:
TOTAL WORK DONE :0+10+5

So i guess I am not adding but concatenating the values. So the varables must be getting treated as strings rather than integer values? I don't immediately see what I have done wrong here? Any advice gratefully received.

Thanks in advance.
 

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LEARN ABOUT XFREE86

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)
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