asked on

why is my command unable to append to a file?

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.

Tintin

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.

pvinodp

ASKER

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?

ASKER CERTIFIED SOLUTION

Tintin

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pvinodp

ASKER

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