Linux String Substitute (sed)

TASK

There is some data on Nautilus App Server 3 in Stratos DC. Data needs to be altered in several of the files. On Nautilus App Server 3, alter the /home/BSD.txt file as per details given below:

1. Delete all lines containing word following and save results in /home/BSD_DELETE.txt file1. (Please be aware of case sensitivity)

2. Replace all occurrence of word or to them and save results in /home/BSD_REPLACE.txt1 file.

Note: Let's say you are asked to replace word to with from. In that case, make sure not to alter any words containing this string; for example upto, contributor etc.

SOLUTION

# ssh into the server
ssh steve@stapp03

# delete
sed -e '/following/d' /home/BSD.txt > /home/BSD_DELETE.txt

# replace
sed 's/\bor\b/them/g' /home/BSD.txt > /home/BSD_REPLACE.txt

# confirm operations
cat /home/BSD_DELETE.txt
cat /home/BSD_REPLACE.txt