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How to subtract two files using grep
준호씨
2017. 5. 18. 21:16
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fileA
a
b
c
10
20
30
fileB
b
c
d
30
fileA - fileB
$ grep -F -x -v -f fileB fileA
1
10
20
shorter way
$ grep -Fxvf fileB fileA
1
10
20
man grep
...
-F, --fixed-strings
Interpret pattern as a set of fixed strings (i.e. force grep to behave as fgrep).
-f file, --file=file
Read one or more newline separated patterns from file. Empty pattern lines match every input line. Newlines are not considered
part of a pattern. If file is empty, nothing is matched.
...
-v, --invert-match
Selected lines are those not matching any of the specified patterns.
...
-x, --line-regexp
Only input lines selected against an entire fixed string or regular expression are considered to be matching lines.
...
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