regex - shell sed to replace a special character in a text file but unable to replace it -


i trying replace sam_18 sam in text file doesnt produce correct result.

sed -i -e 's/sam_18/sam/g'

it doesnt produce output. bit confused if considering '_' in between special character. help?thanks

option -i requires file (at least) perform in-place substitution:

sed -i -e 's/sam_18/sam/g' myfile

if no file provided, sed reads standard input (or input pipe). cannot use -i in case. like:

cat myfile | sed -e 's/sam_18/sam/g' > newfile

-

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