I have file with 70 lines.

I want to add 'SLV' at the starting of the line if the line has first character as 0 or 1 or 2 or ..9

Nothing else has to be changed in the file. Please anyone advice.

sed -e "s/^\([0123456789]\)/SLV \1/g" file.txt

shell

#!/bin/sh
while IFS= read -r line
do
 case $line in 
   [0-9]* ) printf "%s\n" "SLV $line";;
    *) printf "%s\n" "$line";;
 esac
done < "file" > newfile

sed 's/^[0-9]/SLV &/' file.txt

using Perl:

perl -pi -e 's/^(\d)/SLV \1/' file

=======================================================

#!/usr/bin/ksh

ls -l |grep .txt|nawk '{print $9}' > list

while read FILE

do

perl -pi -e 's/01/09\/SWV/g' $FILE

done <list