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You should also ensure the scripts you're calling are in your $PATH or else specified via absolute paths.

try

echo "******Select option:******"
echo "1 - script1"
echo "2 - script2"
echo "3 - script3"
read option
echo "You have selected" $option"."
if [ "$option" = "1" ]
then
script1.sh...

Try this (relying on your sed's capability to interpret EREs):$ sed -r '/<abc-ref>/ {N;N;/hij/ {s#(abc-ref)#!--\1#; s#(/abc-ref)#\1--#}}' file
<abc-ref>
<abc-name>abc.efg.saw.klm</abc-name> ...