Shell Programming and Scripting

Originally Posted by guruprasadpr

Code:

sed -i 's/\(var1=\).*/\11/'  var

-i To update the file in-place
s - To find and replace (eg: s/find/replace/)
var1= - Finds the line containing the pattern var1= and it is grouped using brackets () which can be accessed in the replacement section as \1
\11 - \1 is stands for "var1=" in this case and the second 1 is the replacement value.

To do it for multiple variables, do something like:

Code:

sed -i 's/\(var1=\).*/\11/; s/\(var2=\).*/\15/' file

where the value of var1 is set to 1 and var2 is set to 5.

Guru.