/Shell/Bash/Linux remove lines from one file in another

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...

Source: stackoverflow.com

Linux remove lines from file

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

Source: stackoverflow.com

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