You can use Linux sed, awk, or grep commands to delete lines in a text file that contain a specific string
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## Using sed [sed '/pattern/d' ./infile] cat < Hello everyone welcome to cloudaffaire cloudaffaire loves linux this is debjeet EOF sed -i '/cloud/d' ./file.txt cat file.txt ## Returns ## Hello everyone ## this is debjeet ## Using awk [awk '!/pattern/' file > temp && mv temp file] cat < Hello everyone welcome to cloudaffaire cloudaffaire loves linux this is debjeet EOF awk '!/cloud/' file.txt > temp && mv temp file.txt cat file.txt ## Returns ## Hello everyone ## this is debjeet ## Using grep [grep -v "pattern" file > temp; mv temp file] cat < Hello everyone welcome to cloudaffaire cloudaffaire loves linux this is debjeet EOF grep -v "cloud" file.txt > temp; mv temp file.txt cat file.txt ## Returns ## Hello everyone ## this is debjeet |