SHELL

linux remove lines from one file in another

If the files are sorted:

comm -23 file1 file2

-23 suppresses the lines that are in both files, or only in file 2. 
If the files are not sorted, pipe them through sort first...

delete lines text file linux

sed -i '' '/pattern to match/d' ./infile

linux remove lines from file

grep -v "pattern" file > temp && mv temp file

linux remove lines from file

> sed '2,4d' file