Linux regular match Little note

1. Using a regular match file name

# # grep-n ' [^\/][a-za-z0-9]*[.a-za-z0-9][a-za-z0-9]*$ ' Regular_express.txt

/etc/init.d/hello.h

/etc/init.d/hehe

2. Using SED to extract the NIC IP

(1)

# ifconfig eth0 |grep ' inet addr '

inet addr:192.168.211.129 bcast:192.168.211.255 mask:255.255.255.0

(2)

# ifconfig eth0 |grep ' inet addr ' | Sed ' s/^.*addr://g '

192.168.211.129 bcast:192.168.211.255 mask:255.255.255.0

(3)

# ifconfig eth0 |grep ' inet addr ' | Sed ' s/^.*addr://g ' | Sed ' s/bcast.*$//g '

192.168.211.129

3.

(1) filter ' man '

# cat/etc/man.config |grep-n ' man '

(2) Replace the contents of the sentence that begins with # with an empty

# cat/etc/man.config |grep-n ' man ' | Sed ' s/#.*$//g '

11:

17:

18:

19:

39:

41:

43:manpath/usr/man

44:manpath/usr/share/man

45:manpath/usr/local/man

46:manpath/usr/local/share/man

47:manpath/usr/x11r6/man

(3) Delete empty lines

# cat/etc/man.config |grep ' man ' |sed ' s/#.*$//g ' | Sed '/^$/d '

Manpath/usr/man

Manpath/usr/share/man

Manpath/usr/local/man

Manpath/usr/local/share/man

Manpath/usr/x11r6/man

Linux regular match Little note