文本处理sed 实践

最新推荐文章于 2024-09-03 17:31:11 发布

john_yan008

最新推荐文章于 2024-09-03 17:31:11 发布

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分类专栏： 10 文本处理sed

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利用sed 取出ifconfig命令中本机的IPv4地址

[root@oracle ~]# ifconfig eth7
eth7      Link encap:Ethernet  HWaddr 00:50:56:85:6E:A1  
          inet addr:192.168.97.164  Bcast:192.168.99.255  Mask:255.255.252.0
          inet6 addr: fe80::250:56ff:fe85:6ea1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:245005 errors:0 dropped:0 overruns:0 frame:0
          TX packets:43923 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:20393259 (19.4 MiB)  TX bytes:7139695 (6.8 MiB)

[root@oracle ~]# ifconfig eth7 | sed -n 's/[[:blank:]]\+inet addr://p' | sed -n 's/[[:blank:]]\+.*//p'
192.168.97.164

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

 [root@oracle ~]# cat -nE fstab 
     1	$
     2	#$
     3	# /etc/fstab$
     4	# Created by anaconda on Mon Aug 20 21:59:28 2018$
     5	#$
     6	# Accessible filesystems, by reference, are maintained under '/dev/disk'$
     7	# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info$
     8	#$
     9	/dev/mapper/VolGroup-lv_root /                       ext4    defaults        1 1$
    10	UUID=505a699b-f58c-447b-bb11-4d64af25a5e5 /boot                   ext4    defaults        1 2$
    11	/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0$
    12	tmpfs                   /dev/shm                tmpfs   defaults        0 0$
    13	devpts                  /dev/pts                devpts  gid=5,mode=620  0 0$
    14	sysfs                   /sys                    sysfs   defaults        0 0$
    15	proc                    /proc                   proc    defaults        0 0$
[root@oracle ~]# sed  's/^#[[:blank:]]\+//'  fstab 

#
/etc/fstab
Created by anaconda on Mon Aug 20 21:59:28 2018
#
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
#
/dev/mapper/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=505a699b-f58c-447b-bb11-4d64af25a5e5 /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
[root@oracle ~]#

处理/etc/fstab路径,使用sed命令取出其目录名和基名

[root@oracle ~]# dirname /etc/fstab 
/etc
[root@oracle ~]# find /etc -name fstab | sed  's/\/fstab$//'
/etc
[root@oracle ~]# find /etc -name fstab | sed 's@/.*/@@'
fstab