Change value in a textFile


 
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# 1  
Old 02-01-2013
Change value in a textFile

Hi everyone,

I need to make a script to take three parameters:

-> KEY
-> NEW_VALUE
-> FILE

The FILE is a text plane file.
The KEY is a variable to configure, for example:

Code:
KEY1   =    HOLA
KEY2=   HOLA
KEY3=HELLO
KEY4           =HOLA

And the NEW_VALUE is the string next to symbol "=".

The script must change a value of a "KEY". For example, supose i have the next file:

Code:
KEY1   =    HOLA
KEY2   =   HOLA
KEY3   =HELLO
KEY4           =HOLA

I execute the next comand: ./script 'KEY2' 'BAZINGA' 'myFile.txt'

The result must be:

Code:
KEY1   =    HOLA
KEY2   =BAZINGA
KEY3   =HELLO
KEY4           =HOLA

I did the next script:

Code:
CLAVE=$1
NEWVALUE=$2
ARCHIVO_DESTINO=$3

if [ ! -f $ARCHIVO_DESTINO ]
then
	echo "ERROR EN CHANGE_VALUE_CONFIG, NO se encontro el archivo: $ARCHIVO_DESTINO"
	exit 1
fi


awk -F= -v P1="$CLAVE" -v P2="$NEWVALUE" '$1==P1{$0=P2}1' $ARCHIVO_DESTINO > temporalConfig

rm $ARCHIVO_DESTINO
mv temporalConfig $ARCHIVO_DESTINO

The problem is: just works well, when there is not space between "KEY" and "=" and "VALUE". For example "KEY1=HOLA". I need to this work with the next format "KEY1 =HOLA". How can i change my script?

Thanks!
Sorry for my english!
# 2  
Old 02-01-2013
Code:
awk -F' *= *' ....

# 3  
Old 02-02-2013
Watch out in your awk script - I assume you don't want {$0=P2} but {$2=P2}.

If you really want to keep your spacing, try sth like sub(/[^ ]*/, P2, $2) in the action part. If your key contains spaces, the regex will be a bit more difficult to define.
# 4  
Old 02-02-2013
Try this code:
Code:
awk -F= -v P1="$CLAVE" -v P2="$NEWVALUE" '{F1=$1; gsub(" ","",F1); if(P1==F1) $2=P2;}1' OFS== myFile.txt

# 5  
Old 02-04-2013
Excellent! Works bipinajith!. I have to take time to read this "awk" Smilie
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