2019-04-08

输入net 显示网卡配置文件内容
1.临时-重新登录之后失效
[root@lidiao ~]# alias net='cat /etc/sysconfig/network-scripts/ifcfg-eth0'
[root@lidiao ~]# net
TYPE=Ethernet
BOOTPROTO=none
NAME=eth0
UUID=fa77146b-1e0c-4544-8ecb-5a98a6ebfc41
DEVICE=eth0
ONBOOT=yes
IPADDR=10.0.0.201
PREFIX=24
GATEWAY=10.0.0.254
DNS1=10.0.0.254
DNS2=223.5.5.5
2.永久 /etc/profile    
[root@lidiao ~]# tail -1 /etc/profile
alias net='cat /etc/sysconfig/network-scripts/ifcfg-eth0'
让配置生效
[root@lidiao ~]# source  /etc/profile
3.检查
[root@lidiao ~]# alias net
alias net='cat /etc/sysconfig/network-scripts/ifcfg-eth0'
三剑客老三-grep 过滤 在文件中进行查找。

vim 编辑文件 /oldboy
[root@lidiao~]# alias grep
alias grep='grep --color=auto' #centos 7下面 默认就有 CentOS6 5需要手动配置

-n 显示行号和内容
grep 'ssh' /tmp/vim.log
grep -n 'ssh' /tmp/vim.log

-w 按照单词进行过滤

[root@lidiao ~]# grep -w  '22'  /tmp/vim.log 
ssh             22/tcp                          # The Secure Shell (SSH) Protocol
ssh             22/udp                          # The Secure Shell (SSH) Protocol
ssh             22/sctp                 # SSH
c1222-acse      1153/tcp                # ANSI C12.22 Port
c1222-acse      1153/udp                # ANSI C12.22 Port
[root@lidiao ~]# grep -w  'ssh'  /tmp/vim.log 
ssh             22/tcp                          # The Secure Shell (SSH) Protocol
ssh             22/udp                          # The Secure Shell (SSH) Protocol
x11-ssh-offset  6010/tcp                        # SSH X11 forwarding offset
ssh             22/sctp                 # SSH
netconf-ssh     830/tcp                 # NETCONF over SSH
netconf-ssh     830/udp                 # NETCONF over SSH
sdo-ssh         3897/tcp                # Simple Distributed Objects over SSH
sdo-ssh         3897/udp                # Simple Distributed Objects over SSH
tl1-ssh         6252/tcp                # TL1 over SSH
tl1-ssh         6252/udp                # TL1 over SSH
ssh-mgmt        17235/tcp               # SSH Tectia Manager
ssh-mgmt        17235/udp               # SSH Tectia Manager

-i ignore-case 过滤的时候忽略大小写
在文件中查找出包含ipaddr的行
[root@lidiao ~]# grep 'ipaddr' /tmp/vim.log
[root@lidiao ~]# grep -i 'ipaddr' /tmp/vim.log
IPADDR=10.0.0.201

grep 排除/取反 -v
我想找出不包含#的行

grep小结:
-n 显示行号和内容
-i 不区分大小写
-v 取反或排除
-w 按照单词进行过滤

grep命令练习题:
准备环境:
cat >/tmp/oldboy.txt< oldboy
alex
oldboyoldboy
alexoldboy
Oldboy oLdboy
OLDBOY
EOF

1.过滤出文件中包含oldboy的行及行号
2.过滤出文件中包含oldboy(不区分大小写)的行及行号
3.过滤出不包含oldboy(不区分大小写)的行
4.按单词过滤出oldboy(不区分大小写)

1.过滤出文件中包含oldboy的行及行号
[root@lidiao ~]# grep -n 'oldboy' /tmp/oldboy.txt
1:oldboy
3:oldboyoldboy
4:alexoldboy
2.过滤出文件中包含oldboy(不区分大小写)的行及行号
[root@lidiao ~]# grep -in 'oldboy' /tmp/oldboy.txt
1:oldboy
3:oldboyoldboy
4:alexoldboy
5:Oldboy oLdboy 
6:OLDBOY
3.过滤出不包含oldboy(不区分大小写)的行
[root@lidiao~]# grep -iv 'oldboy' /tmp/oldboy.txt
alex
[root@lidiao ~]# cat /tmp/oldboy.txt
oldboy
alex
oldboyoldboy
alexoldboy
Oldboy oLdboy 
OLDBOY
#####4.按单词过滤出oldboy(不区分大小写)
[root@lidiao ~]# grep -i 'oldboy' /tmp/oldboy.txt
oldboy
oldboyoldboy
alexoldboy
Oldboy oLdboy 
OLDBOY
[root@oldboyedu59 ~]# grep -iw 'oldboy' /tmp/oldboy.txt
oldboy
Oldboy oLdboy 
OLDBOY
tr 简单1对1替换

< 输入重定向符号

[root@lidiao ~]# tr 'o' '0'   /tmp/oldboy.txt
tr: extra operand ‘/tmp/oldboy.txt’
Try 'tr --help' for more information.
[root@lidiao ~]# tr 'o' '0'  < /tmp/oldboy.txt
0ldb0y
alex
0ldb0y0ldb0y
alex0ldb0y
Oldb0y 0Ldb0y 
OLDBOY

[root@lidiao ~]# cat /tmp/oldboy.txt
oldboy
alex
oldboyoldboy
alexoldboy
Oldboy oLdboy 
OLDBOY
[root@lidiao ~]# tr 'a-z' 'A-Z' < /tmp/oldboy.txt 
OLDBOY
ALEX
OLDBOYOLDBOY
ALEXOLDBOY
OLDBOY OLDBOY 
OLDBOY
文件属性说明
[root@lidiao ~]# ls -lhi
total 24K
134329384   drwxr-xr-x.  3  root root   15 Mar  28  15:21  1
134329379   -rw-r--r--.  1  root root    0 Mar  28  15:15  1.txt
134329380   -rw-r--r--.  1  root root    0 Mar  28  15:15  2.txt
134329381   -rw-r--r--.  1  root root    0 Mar  28  15:15  3.txt
134329382   -rw-r--r--. 1   root root    0 Mar  28  15:15  4.txt
134329383   -rw-r--r--.  1  root root    0 Mar  28  15:15  5.txt
        1                 2        3        4          5          6                7

1:inode索引节点属性信息
2:文件权限信息
3:硬链接数
4:属主,属组
5:文件大小
6:文件修改时间信息
7:文件名

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