Unix: Edit/Add string into a file

Here I have given useful scripts for editing and append some text into a file.

This command used to get the line number of a word in the file.

#grep -n "word" asd1.sh | cut -f1 -d:

To get the output in a variable use the below command:

#VAR='grep -n "word" asd1.sh | cut -f1 -d:'

Below command will add 1 to result line. bc is the command line calculator.

#echo `grep -n "word" asd1.sh | cut -f1 -d:` + 1 | bc


Command to add text in a file at given location

#awk 'NR==3{print "newline"}1' asd1.sh


test.sh

findline=`grep -n "log4j:configuration" jboss-log4j.xml | cut -f1 -d:`
addline=`echo $findline+1| bc`
sed ""${addline}"i\ $appender" jboss-log4j.xml > test.txt


The above command will be useful for adding the appender to Jboss log4j xml file during deployment.