Edit a file using shell script

[nitalc]

I want to replace a word in a text file (file.txt) using shell script. The contents of the file are:

file.txt
--------------
line one goes here
line two is here
and so on........


I tried following command for replacing a text:

sed -e 's/here/dear/g' file.txt

It did replace the text but not in the file. I got the replaced text as an output on the console as following.

line one goes dear
line two is dear
and so on........

I want to replace the text in the file. How do I do that?

[markcole]

You have to redirect the output to a file and then save that file as the old one.

sed -e 's\here\dear\g' file.txt > filenew.txt
mv filenew.txt file.txt

[Irithori]

sed -i also works, but keep in mind, that this is not portable between different unixes