Some uses of shell grep

#1, total number of statistical characters

#统计系统中不允许登录的用户数

Grep-c ' Nologin '/etc/passwd

#2, case-insensitive lookup of all lines of the specified character;

Grep-i ' Good ' 9.txt

#3, print the line and line number of the specified character;

Grep-n "Good" 9.txt

#4, lines that do not print the specified characters

Grep-v "Good" 9.txt

#5, printing begins with a character good, followed by a line of numbers

grep "good[0-9]" 9.txt

#6, lines that match G or G

grep "[Gg]ood" 9.txt

#7, display the line at the beginning of the output that is not good

grep "^[^good]" 9.txt

#8, Match G, two arbitrary characters, immediately following the D line

grep "G.. D "9.txt

#9, match uppercase letters, and follow OO word lines

grep ' [A-z]oo ' 9.txt

#10, print a row with more than n occurrences of the specified character

Grep-n ' o\{2,\} ' 9.txtgrep-n ' o\{3,4\} ' 9.txt

#11, the line number where the blank line is printed

Grep-n "^$" 9.txt

#12, mismatched # and blank lines in a file

Grep-ve ' #|^$ ' httpd.conf

#13, matching files that contain the specified characters

#-r: In the current directory and its subdirectories

#-l: Matching rows are not displayed, only matching files are displayed

Grep-r-n ' good '/home/bel/*grep-r-l ' good '/home/bel/*

#14, Match IPV4 address

Ifconfig | grep--color-e "\< ([0-9]{1,3}\.) {3} [0-9] {1,3}^$\> "

#15,

#显示匹配某个结果之后的3行, use the-a option

#显示匹配某个结果之前的3行, use the-B option

#显示匹配某个结果的前三行和后三行, use the-C option

Seq 10 | grep ' 5 '-a3seq 10 | grep ' 5 '-b3seq 10 | grep ' 5 '-c3

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Some uses of shell grep