[NTLUG:Discuss] change words on every line in a file

[o k]

All is there any have a good suggestion on change words on every line in a file. ex:original: dog     1234cat     1234mouse  1234houesr 1234 after changed dog 9899cat 9899mouse 9899house 9899 I have this, but seems to not woking: #!/bin/sh
v='9899'
cat file | while read s1 s2
do
if [ "$s2" != "$v" ]; then
    echo $s1 '--' $s2
   cat  "$s1" ' ' "$IPADDR" >> file
   sed -i '/$s2/ d' file
fi
done
exit 0 thank for your help.