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Replace a word with another in bash
hello sara, my name is sara too.

hello mary, my name is mary too.

s='hello sara , my name is sara too .'
r=${s//sara/mary}
echo $r

sed 's/sara/mary/g' <<< $s
echo $r

hello mary , my name is mary too .

$ sed s/sara/mary/g <<< 'hello sara , my name is sara too .'
hello mary , my name is mary too .

$ cat FILE
hello sara , my name is sara too .
$ sed -i s/sara/mary/g FILE
$ cat FILE
hello mary , my name is mary too .

# sed 's/sara/mary/g' FILENAME

# perl -p -i -e 's/sara/mary/g;' FILENAME

awk '{gsub("sara","mary")}1' <<< "hello sara, my name is sara too."