Stream Editor

$ cat pear.txt
jewel worm
jewerly wormy worm jewel
hay jewel jewel
kitten                   
$ cat pear.txt | sed -e "s/jewel/rock/"
rock worm
jewerly wormy worm rock
hay rock jewel
kitten
$ cat pear.txt | sed -e "s/e/WWW/g"
jWWWwWWWl worm
jWWWwWWWrly wormy worm jWWWwWWWl
hay jWWWwWWWl jWWWwWWWl
kittWWWn                                                   
$ 
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