时间: 2006-09-25 / 分类: WEB后端编程 - 开发与实践 / 浏览次数: / 0 个评论 发表评论
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: g (globally) search for a re (regular expression ) and p (print ) the results.

1、参数:

-I :忽略大小写

-c :打印匹配的行数

-l :从多个文件中查找包含匹配项

-v :查找不包含匹配项的行

-n:打印包含匹配项的行和行标

2RE(正则表达式)

\ 忽略正则表达式中特殊字符的原有含义

^ 匹配正则表达式的开始行

$ 匹配正则表达式的结束行

\< 从匹配正则表达式的行开始

\> 到匹配正则表达式的行结束

[ ] 单个字符;如[A] A符合要求

[ – ] 范围 ;如[A-Z]ABC一直到Z都符合要求

. 所有的单个字符

* 所有字符,长度可以为0

3、举例

# ps -ef | grep in.telnetd

root 19955 181 0 13:43:53 ? 0:00 in.telnetd

# more size.txt size文件的内容

b124230

b034325

a081016

m7187998

m7282064

a022021

a061048

m9324822

b103303

a013386

b044525

m8987131

B081016

M45678

B103303

BADc2345

# more size.txt | grep ‘[a-b]’ 范围 ;如[A-Z]ABC一直到Z都符合要求

b124230

b034325

a081016

a022021

a061048

b103303

a013386

b044525

# more size.txt | grep ‘[a-b]’*

b124230

b034325

a081016

m7187998

m7282064

a022021

a061048

m9324822

b103303

a013386

b044525

m8987131

B081016

M45678

B103303

BADc2345

# more size.txt | grep ‘[b]’ 单个字符;如[A] A符合要求

b124230

b034325

b103303

b044525

# more size.txt | grep ‘[bB]’

b124230

b034325

b103303

b044525

B081016

B103303

BADc2345

# grep ‘root’ /etc/group

root::0:root

bin::2:root,bin,daemon

sys::3:root,bin,sys,adm

adm::4:root,adm,daemon

uucp::5:root,uucp

mail::6:root

tty::7:root,tty,adm

lp::8:root,lp,adm

nuucp::9:root,nuucp

daemon::12:root,daemon

# grep ‘^root’ /etc/group 匹配正则表达式的开始行

root::0:root

# grep ‘uucp’ /etc/group

uucp::5:root,uucp

nuucp::9:root,nuucp

# grep ‘\<uucp’ /etc/group

uucp::5:root,uucp

# grep ‘root$’ /etc/group 匹配正则表达式的结束行

root::0:root

mail::6:root

# more size.txt | grep -i ‘b1..*3’ -i :忽略大小写

b124230

b103303

B103303

# more size.txt | grep -iv ‘b1..*3’ -v :查找不包含匹配项的行

b034325

a081016

m7187998

m7282064

a022021

a061048

m9324822

a013386

b044525

m8987131

B081016

M45678

BADc2345

# more size.txt | grep -in ‘b1..*3’

1:b124230

9:b103303

15:B103303

# grep ‘$’ /etc/init.d/nfs.server | wc -l

128

# grep ‘\$’ /etc/init.d/nfs.server | wc –l 忽略正则表达式中特殊字符的原有含义

15

# grep ‘\$’ /etc/init.d/nfs.server

case “$1” in

>/tmp/sharetab.$$

[ “x$fstype” != xnfs ] && \

echo “$path\t$res\t$fstype\t$opts\t$desc” \

>>/tmp/sharetab.$$

/usr/bin/touch -r /etc/dfs/sharetab /tmp/sharetab.$$

/usr/bin/mv -f /tmp/sharetab.$$ /etc/dfs/sharetab

if [ -f /etc/dfs/dfstab ] && /usr/bin/egrep -v ‘^[ ]*(#|$)’ \

if [ $startnfsd -eq 0 -a -f /etc/rmmount.conf ] && \

if [ $startnfsd -ne 0 ]; then

elif [ ! -n “$_INIT_RUN_LEVEL” ]; then

while [ $wtime -gt 0 ]; do

wtime=`expr $wtime – 1`

if [ $wtime -eq 0 ]; then

echo “Usage: $0 { start | stop }”

# more size.txt

the test file

their are files

The end

# grep ‘the’ size.txt

the test file

their are files

# grep ‘\<the’ size.txt

the test file

their are files

# grep ‘the\>’ size.txt

the test file

# grep ‘\<the\>’ size.txt

the test file

# grep ‘\<[Tt]he\>’ size.txt

the test file

The end

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