a013386
b044525
m8987131
B081016
M45678
B103303
BADc2345
# more size.txt | grep 'b' 单个字符；如[A] 即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.$$
[ "x$fstype" != xnfs ] &&
echo "$patht$rest$fstypet$optst$desc"
>>/tmp/sharetab.$$
/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
