Shell Programming and Scripting

var=1
var1=1
run=0

#! /bin/sh

. /mydir/myfile.cfg

echo $var"\t" $var1

exit

$ cat myfile.cfg
var=1
var1=1
run=1

$ cat update.sh
num=`grep run= myfile.cfg | sed "s/run=//"`
num=`expr $num + 1`
sed "s/run=.*/run=$num/" myfile.cfg > temp.x
mv temp.x myfile.cfg

$ ./update.sh

$ cat myfile.cfg
var=1
var1=1
run=2

$ cat update.sh
num=`grep run= myfile.cfg | sed "s/run=//"`
num=`expr $num + 1`
buffer=`sed "s/run=.*/run=$num/" myfile.cfg`
echo "$buffer" > myfile.cfg

awk -F'=' '/run=/ {$NF+=1}{R=(R==""?$0:R RS $0)}END{print R > "myfile.cfg"} ' OFS='=' myfile.cfg