Question

i found some freaky error. I want to increment a counter, but the variable isnt visible outside the while do.

The script as follows:

    ## $1 - The file which should be examined
## $2 - The time passed between the checks. If $2 is 5 then all lines from the last 5 minutes are taken
## $3 - The Errormessage to search for

outputOK="OK - nothing happened"
output_logcheck=0;
errlines="";

cat $1 | grep "$3" | while read line
do
        linedate=`date -d "$(echo $line | cut -d " " -f 2)"  '+%s'`
        nowdate=`date '+%s'`

        if [ $(( $nowdate - (60 * $2) )) -le $linedate ]
        then
                $output_logcheck=$[$output_logcheck+1]
                $errlines="${errlines} -- ${line}"
        fi
done;

if [ $output_logcheck -eq 0 ]
then
        echo $outputOK
else
        echo "CRITICAL - There are -= ${output_logcheck} =- $3 -- Lines: $errlines"
fi

So i dont know what else to try.
Thanks in advance.

Answer 1

The problem is that pipe create a SubShell.

change

cat $1 | grep "$3" | while read line
do
    ...
done

to

while read line
do
    ...
done <(cat $1 | grep "$3")