8 Linux grep

• Well, here can not complain because of network reasons, several times to write blog is the speed of the good coax to back, Dan Hurt Ah!

  • Text Search tool: Grep,egrep,fgrep

1 (1) grep "^[[:alpha:]]*"/proc/meminfo

(2)

grep "^[a-za-z]\+"/proc/meminfo

2 Grep-v ". *\/sbin\/nologin. *"/etc/passwd | Cut-d:-f1

Grep-v ". *\/sbin\/nologin$"/etc/passwd | Cut-d:-f1

3 grep ". *\/bin\/bash. *"/etc/passwd | Cut-d:-f1

grep ". *\/bin\/bash$"/etc/passwd | Cut-d:-f1

4 grep "\<[[:d igit:]][[:d igit:]]\>"/etc/passwd--color=auto

grep "\<[[:d igit:]]\{2\}\>"/etc/passwd--color=auto

5

grep "^[[:space:]]\{1,\}.*"/boot/grub/grub.conf grep "^[[:space:]]\+"

6 Displays the default shell for root, fedora, or User1 users on the current system

Egrep--color "^root|^fedora|^user1"/etc/passwd | cut-d:-f1,7 egrep--color "^ (root|fedora|user1) \>"/etc/passwd | Cut-d:-f1,7

7 Find the line after a word in the/etc/rc.d/init.d/functions file followed by a set of parentheses, such as: Hello ()

Egrep--color=auto "*\<[[:alnum:]]+\>\ (\)"/etc/rc.d/init.d/functions |cut-d "-f1

- o option

8 echo "/etc/sysconfig" | Grep

# basename/etc/sysconfig/

Sysconfig

echo "Etc/sysconfit/net-scripts" | Egrep--color=auto "*[^/]+$"

# Basename/etc/sysconfig

Sysconfig

Extension: Take out its path name

9 find the number between 1-255 in the ifconfig command result

Ifconfig | Egrep "\< ([0-9]|[ 1-9][0-9]|1[0-9][0-9]|2[0-5][0-5]) \> "--color=auto

10 Challenge: Write a pattern to match a reasonable IP address

11 Challenge: Write a pattern to match all email addresses

Because the specific e-mail address rules are unknown, so the following is written by themselves, feel good

Egrep--color=auto "^[[:alnum:]]+ (_?[ [: Alnum:]] +) {0,}@ ([[: Alnum:]]+\.) {0,} [[: alnum:]]+$] Matchmail.regexp

This article is from the "Ops Dog" blog, make sure to keep this source http://yunweigou.blog.51cto.com/6299641/1632012

8 Linux grep