Config file auto-updation

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# 1  
HP Config file auto-updation

Hello All,

I need to update my .cfg file which is used in the script for almost all runs.

myfile.cfg file:

#! /bin/sh

. /mydir/myfile.cfg

echo $var"\t" $var1


So, the requirement is that the myfile.cfg should update every time I run the script. say run=1 and in the next run run=2 and go on.

I was thinking to do with sed. But it would need a temporary file as my system doesn't support -i.
# 2  
$ cat myfile.cfg

$ cat
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

$ ./

$ cat myfile.cfg

# 3  
@hanson: Thanks for the concern. But I was thinking to do this without a temporary file.

Space "really" matters on the server that I'm working on Smilie
# 4  
$ cat
num=`grep run= myfile.cfg | sed "s/run=//"`
num=`expr $num + 1`
buffer=`sed "s/run=.*/run=$num/" myfile.cfg`
echo "$buffer" > myfile.cfg

# 5  
@hanson: Coool... Smilie This works...
# 6  
awk -F'=' '/run=/ {$NF+=1}{R=(R==""?$0:R RS $0)}END{print R > "myfile.cfg"} ' OFS='=' myfile.cfg

# 7  
I would advise not to modify your script with every run; it just does not make sense. If you run your scripts in the same session, keep the run No. in a variable; if run across session, keep it in a file, or, e.g. a symbolic link.
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