Shell Script To Replace String in A File

using linux sed command we can find a word or string in a file and we can replace a that string with another new string.

Shell Script To Replace String in A File

sed -i -e 's/old/new/g' hello.txt
sed -i -e 's/cat/dog/g' hello.txt

or 


sed -ie 's/cat/dog/g' hello.txt

above command will find all strings called as a cat and it will replace all cat strings with dog.

s/ is used to substitute the found string  cat with dog

/g stands for "global". i.e. replace all and not just the first occurrence

-i option is used to edit in place on the file hello.txt.

-e option indicates the expression/command to run, in this case s/.

• shell script to replace a string in a file
• shell script to replace text in file