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why is my command unable to append to a file?

Posted on 2014-03-24
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Last Modified: 2014-03-24
when i run the script directly then I am able to append to the variable [FileName] $logFile

script1.sh

!/bin/sh
IPA_LOG=${IPA_LOG:=/tmp/oli}
monitor="gf"
process_pid="10162"
cmd_array=("cat /proc/${process_pid}/status")
logFile=${IPA_LOG}/$monitor.log

 fileType="mem"
 cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$4 } { if ( user == \"$fileType\" ) { print } }' | sort -nrk 7 |  head -100"

        for i in "${cmd_array[@]}"
        do
         eval ${i} >> $logFile
        done
---------------------------------------------------------------------------------------------------
but if called thru chain of script:

!/bin/sh
#scriptA
...
..
start()
{
scriptB &
}

!/bin/sh
#scriptB
...
..
doSomething(){
script1 &
}

Now the script1 is unable to append to the logFile variable. I have tried changing the chmod and chown options. But no use.
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Question by:pvinodp
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4 Comments
 
LVL 48

Expert Comment

by:Tintin
ID: 39951834
How are you determining it isn't appending?  

Are there any error messages?

Is the IPA_LOG variable defined?

Add a

set -x

Open in new window


near the top of script1 and post the output.

BTW, I assume you typed the scripts here as they contain errors.  Always best to copy/paste.
0
 

Author Comment

by:pvinodp
ID: 39952243
ok. let me put it more clearly:
following is the outline of script1.sh.

!/bin/sh
pid=$1
type=$2

functionA(){

  while :
  do

    if[cpu_id -gt threshold_const]
    then
       for i in "${cmd_array[@]}"
        do
         eval ${i} >> $logFile
        done
    fi

  done
}

if [x$type == xgf]
then
#accordingly i populate the cmd_array and logFile variable
functionA
fi

if [x$type == xok]
then
#accordingly i populate the cmd_array and logFile variable
functionA
fi

If I call this script by passing the 2 arguments the logs are not appending. But I can see on the filesystem that the timestamp of the logFile is updated.

If i just remove all the code and just keep the following then I see that the logFile is appended.

!/bin/sh
IPA_LOG=${IPA_LOG:=/tmp/oli}
monitor="gf"
process_pid="10162"
cmd_array=("cat /proc/${process_pid}/status")
logFile=${IPA_LOG}/$monitor.log

 fileType="mem"
 cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$4 } { if ( user == \"$fileType\" ) { print } }' | sort -nrk 7 |  head -100"

        for i in "${cmd_array[@]}"
        do
         eval ${i} >> $logFile
        done


The only diffrence here is that the logFile is static and there is no while loop. Do u see any leak somewhere?
0
 
LVL 48

Accepted Solution

by:
Tintin earned 500 total points
ID: 39952253
Inside functionA

add

set -x

that way you can see exactly what it is attempting to do.
0
 

Author Comment

by:pvinodp
ID: 39952303
thanks for the input...
inside the function i have another line which has > instead of >>
thanks for suggesting to define "set -x" inside the function
0

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