sed command examples
Create the file addresses with the following content.
Ramesh Shetty, 34, 4th Cross, Kuvempu Nagar, Mysore KA
Suresh Bendre, 56, 3rd Main, T Nagar, Chennai TN
John Simon, 24, 5th Main, Jaya Nagar, Bangalore KA
G H Shinde, 56, 6th Main, Bandra, Mumbai MH
S Manjrekar, 39, 8th Main, Chanakya Puri ND
P K Reddy, 67, 9th Main, Charminar, Hyderabad AP
Replace KA with Karnataka
sed 's/ KA/, Karnataka/' addresses
Replace KA and TN with Karnataka and Tamil Nadu respectively
sed -e 's/ KA/Karnata/' -e 's/ TN/Tamil Nadu/' addresses
A script to replace abbreviations with state names
Syntax: sed -f scriptfile input_file
Write the following commands in the file states
s/ KA/, Karnataka/
s/ TN/, Tamil Nadu/
s/ MH/, Maharashtra/
s/ ND/, New Delhi/
s/ AP/, Andhra Pradesh/
Then run the following command
sed -f states addresses
To suppress the automatic output
Syntax: sed -n [instructions] [input_file]
sed -n -f states addresses
Saving the changes
None of the above commands do not save the changes to the file. The changes are just printed and not saved. Changes can be saved in two ways:
Write the output to a new file:
sed -f states addresses > newaddresses
Here > is the redirection operator.
Save the changes to the same file:
sed -i -f states addresses