1、从firefox中提取cookie
grep -oP '"url":"\K[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)
2、查找忽略大小写
grep -i joe users.txt # find joe, Joe, JOe, JOE, etc.
3、正则匹配搜索
grep '^fred' /etc/passwd # find 'fred', but only at the start of a line
grep '[FG]oo' * # find Foo or Goo in all files in the current dir
grep '[0-9][0-9][0-9]' * # find all lines in all files in the current dir with three numbers in a row
4、根据匹配关键字所在行
grep -B5 "the living" gettysburg-address.txt # show all matches, and five lines before each match
grep -A10 "the living" gettysburg-address.txt # show all matches, and ten lines after each match
grep -B5 -A5 "the living" gettysburg-address.txt # five lines before and ten lines after
5、
