Grep

Grep
grep manual.

1)$ grep -n '^south' datafile

3:southwest SW Lewis Dalsass 2.7

2)$ grep -i 'pat' datafile

Pat Huang yuanxiao

ps: The -i option turns off case sensitivity (nomatter lowercase or uppercase ).

3)$grep -v 'Li' datefile

ps:The -v option prints all lines not contain the pattern 'Li'.

4)$grep -l 'SE' *

ps: The -l option only prints the filenames where the pattern is found.

5)$grep -c 'west' datafile

ps:The -c option causes grep to print how much lines which

matches the pattern .(but if the pattern matches three times in a line, it

only count one time)

6)$grep -w 'north' datafile

ps:The -w option causes grep to find the pattern only if it is a word, not

part of word. only the line contain the word north is printed, not

northwest.



summary:grep can used combine with regular expression, so it's a powerful

tool of unix.

grep [-v] [-l] [-w] [-c] [-] [] [] [] [] [ ]