分享程序员开发的那些事...
更新时间：2022-10-04 13:47:06
1、删除/etc/grub2.conf文件中所有以空白开头的行行首的空白字符
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[root@centos7 ~]# sed -r 's#^[[:space:]]+##g' /etc/grub2.cfg
## DO NOT EDIT THIS FILE## It is automatically generated by grub2-mkconfig using templates# from /etc/grub.d and settings from /etc/default/grub#### BEGIN /etc/grub.d/00_header ###set pager=1
if [ -s $prefix/grubenv ]; then
load_envfiif [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entryset boot_once=true
elseset default="${saved_entry}"
fiif [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
elsemenuentry_id_option=""
fiexport menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entryset prev_saved_entry=
save_env prev_saved_entryset boot_once=true
fi |
2、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符
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[root@centos7 ~]# sed -r 's/^#[[:space:]]+//g' /etc/fstab
#/etc/fstabCreated by anaconda on Tue Jul 19 14:39:24 2016#Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#UUID=f83c52ce-5740-4f02-bb87-6e190360dc30 / xfs defaults 0 0UUID=c98144e4-d1b4-45b1-bb22-3112420ea487 /boot xfs defaults 0 0
UUID=dbf5c483-133e-4888-bbb1-a9622d83a930 swap swap defaults 0 0#END[root@centos7 ~]#
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2.1、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符且删除以#开头后面全是空白字符的行
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[root@centos7 ~]# sed -r -e 's/^#[[:space:]]+//g' -e '/^#/d' /etc/fstab
/etc/fstabCreated by anaconda on Tue Jul 19 14:39:24 2016Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
UUID=f83c52ce-5740-4f02-bb87-6e190360dc30 / xfs defaults 0 0UUID=c98144e4-d1b4-45b1-bb22-3112420ea487 /boot xfs defaults 0 0
UUID=dbf5c483-133e-4888-bbb1-a9622d83a930 swap swap defaults 0 0[root@centos7 ~]#
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3、在/etc/issue每一行行首增加#号
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[root@centos7 ~]# cat -n /etc/issue
1\S
2Kernel \r on an \m
3
[root@centos7 ~]# sed -r 's@(.*)@#&@g' /etc/issue
#\S#Kernel \r on an \m#[root@centos7 ~]# sed -r 's@(.*)@#\1@g' /etc/issue
#\S#Kernel \r on an \m#[root@centos7 ~]# sed -r 's@^@#@g' /etc/issue
#\S#Kernel \r on an \m#[root@centos7 ~]#
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4、在/etc/fstab文件中不以#开头的行的行首增加#号
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[root@centos7 ~]# sed -r 's/^[^#]/#/g' /etc/fstab
## /etc/fstab# Created by anaconda on Tue Jul 19 14:39:24 2016## Accessible filesystems, by reference, are maintained under '/dev/disk'# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info##UID=f83c52ce-5740-4f02-bb87-6e190360dc30 / xfs defaults#UID=c98144e4-d1b4-45b1-bb22-3112420ea487 /boot xfs defaults#UID=dbf5c483-133e-4888-bbb1-a9622d83a930 swap swap defaults#END[root@centos7 ~]#
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5、处理/etc/fstab路径,使用sed命令取出其目录名和基名
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[root@centos7 Packages]# cd
[root@centos7 ~]# echo "/etc/hosts"|sed -r 's#/.*/([^/]+)#\1#g'
hosts[root@centos7 ~]# echo "/etc/hosts" |sed -r 's#(/.*/)[^/]+/?#\1#g'
/etc/[root@centos7 ~]# echo "/etc/issue"|sed -r 's#(.*/)([^/]+/?)$#\1#g'
/etc/[root@centos7 ~]# echo "/etc/issue"|sed -r 's#(.*/)([^/]+/?)$#\2#g'
issue[root@centos7 ~]# echo "/etc/issue/" |grep '.*/\<'
/etc/issue/[root@centos7 ~]# echo "/etc/issue/" |grep -o '.*/\<'
/etc/[root@centos7 ~]# echo "/etc/issue/" |grep -o '[^/]\+/\?$'
issue/[root@centos7 ~]#
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6、利用sed 取出ifconfig命令中本机的IPv4地址
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[root@centos7 ~]# ifconfig |sed -n 2p
inet 192.168.226.138 netmask 255.255.255.0 broadcast 192.168.226.255
[root@centos7 ~]# ifconfig |sed -n 2p|sed -r 's/.*net //g'
192.168.226.138 netmask 255.255.255.0 broadcast 192.168.226.255[root@centos7 ~]# ifconfig |sed -n 2p|sed -r 's/.*net //g'|sed -r 's/ net.*//g'
192.168.226.138[root@centos7 ~]# ifconfig |sed -nr '2s#^.*net (.*) netm.*$#\1#gp'
192.168.226.138[root@centos7 ~]#
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7、统计centos安装光盘中Package目录下的所有rpm文件的 以.分隔倒数第二个字段的重复次数
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[root@centos7 Packages]# ls *.rpm |sed -r 's/^.*\.(.*)\.rpm/\1/g'|sort |uniq -c |sort
2000 i686
2938 noarch
4069 x86_64
[root@centos7 Packages]# ls *.rpm |rev |cut -d. -f2 |sort|uniq -c|uniq
4069 46_68x
2000 686i
2938 hcraon
[root@centos7 Packages]#
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