If you want to change all occurrences of developer to administrator in the oracle.txt file in the grep example, enter this:
Content of oracle.txt
Oracle database developer
SQL database developer
MYSQL database developer
sed 's/developer/administrator/g' oracle.txt
See the changes below after running SED.
oracle database administrator
SQL database administrator
MYSQL database administrator
In the quoted string, the "s" means substitute, and the "g" means make a global change. You can also leave off the "g" (to change only the first occurrence on each line) or specify a number instead (to change the first n occurrences on each line).
Searching and replacing several strings on a file:
sed 's/-//g' test.txt |sed 's/"//g' | sed 's/;//g' | sed 's/\[//g'Take care of any escape character using additional ‘\’ while searching for ‘[‘