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in line modification in a file using awk

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# 1  
Old 02-05-2011
in line modification in a file using awk
Hi,
I have a conf.file with the following values:
Code:
    ef=78
    b=40
    ca=40
    c=45/dev2

when I modify one of the line with the below awk script,it's modifying BUT it's placing the modified line in the last line :
input:- Configure b 45/dev4
output:-
Code:
    ef=78
    ca=40
    c=45/dev2
    b=45/dev4

Is it possible to have the modified line in the same place where it's in the original file so that it will be easy to take diff.

following is my awk script:
Code:
CONFIG_FILE=conf.file
cp -p "$CONFIG_FILE" "$CONFIG_FILE.orig.`date \"+%Y%m%d_%H%M%S\"`"
/usr/xpg4/bin/awk -v key="$1" -v val="$2" 'match($1,"^"key"=") == 0 && match($1,"^""="val) != 0 {print key"="val}
        match($1,"^"key"=") == 0 && match($1,"^""="val) == 0 {print $0}
        END {print key"="val}' "$CONFIG_FILE" >"$CONFIG_FILE~" && mv "$CONFIG_FILE~" "$CONFIG_FILE"

Thanks for your help...
Last edited by Scott; 02-05-2011 at 06:34 AM.. Reason: Code tags
axes
# 2  
Old 02-05-2011
Alternatively,
Code:
key_id=b
new_val="45/dev4"
while IFS="=" read key val
do
 if [ "$key" = "$key_id" ]; then
   echo "$key=$new_val"
 else 
  echo "$key=$val"
 fi
done < conf.file


Please use code tags next time.
# 3  
Old 02-05-2011
Try:
Code:
awk '$1~"^"key"="{sub(/[^=]+$/,val)}1' key="$1" val="$2" "$CONFIG_FILE"

or
Code:
sed "/[ \t]*$1=/s|=.*|=$2|" "$CONFIG_FILE"

Last edited by Scrutinizer; 02-05-2011 at 07:35 AM..
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