Linux输出重定向

一 标准输入输出

 

 

二 输出重定向

 

 

三 实战

[root@localhost local]# ifconfig > cs.log

[root@localhost local]# cat cs.log

enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

inet 192.168.0.106 netmask 255.255.255.0 broadcast 192.168.0.255

inet6 fe80::a00:27ff:fe01:3653 prefixlen 64 scopeid 0x20<link>

ether 08:00:27:01:36:53 txqueuelen 1000 (Ethernet)

RX packets 4085 bytes 330891 (323.1 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 2503 bytes 427391 (417.3 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

 

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10<host>

loop txqueuelen 0 (Local Loopback)

RX packets 4 bytes 344 (344.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 4 bytes 344 (344.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

 

virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500

inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255

ether 52:54:00:1b:2a:d5 txqueuelen 0 (Ethernet)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 0 bytes 0 (0.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

 

[root@localhost local]#

[root@localhost local]# ls

bin cs.log etc games go include jdk1.8.0_111 jdk-8u111-linux-x64.tar.gz lib lib64 libexec sbin share src

[root@localhost local]# ls > cs.log

[root@localhost local]# cat cs.log

bin

cs.log

etc

games

go

include

jdk1.8.0_111

jdk-8u111-linux-x64.tar.gz

lib

lib64

libexec

sbin

share

src

[root@localhost local]# ls >> cs.log

[root@localhost local]# cat cs.log

bin

cs.log

etc

games

go

include

jdk1.8.0_111

jdk-8u111-linux-x64.tar.gz

lib

lib64

libexec

sbin

share

src

bin

cs.log

etc

games

go

include

jdk1.8.0_111

jdk-8u111-linux-x64.tar.gz

lib

lib64

libexec

sbin

share

src

[root@localhost local]# datac 2>test.log

[root@localhost local]# cat test.log

bash: datac: command not found...

[root@localhost local]# datac 2 > test.log

bash: datac: command not found...

 

四 正确输出和错误输出同时保存

 

 

五 实战

[root@localhost local]# date >test2.log 2>&1

[root@localhost local]# cat test2.log

Sat Jul 15 16:05:00 CST 2017

[root@localhost local]# datetime >test2.log 2>&1

[root@localhost local]# cat test2.log

bash: datetime: command not found...

[root@localhost local]# date &>>test3.log

[root@localhost local]# cat test3.log

Sat Jul 15 16:07:01 CST 2017

[root@localhost local]# datetime &>>test3.log

[root@localhost local]# cat test3.log

Sat Jul 15 16:07:01 CST 2017

bash: datetime: command not found...

[root@localhost local]# ls &>/dev/null

[root@localhost local]# cat xdy>>access.log 2>>error.log

[root@localhost local]# cat error.log

cat: xdy: No such file or directory

[root@localhost local]# cat test3.log>>access.log 2>>error.log

[root@localhost local]# cat access.log

Sat Jul 15 16:07:01 CST 2017

bash: datetime: command not found...

 

六 wc命令

wc [选项] [文件名]

选项：

-c：统计字节数

-w：统计单词数

-l：统计行数

 

七 输入重定向

命令<把文件作为命令的输入

命令<<标识符

...

标识符

把两个标识符之间的内容作为输入

 

八 实战

[root@localhost local]# wc

rere

tr

uyu yt

tyty

 

5 5 21

[root@localhost local]# wc < access.log

2 11 66

[root@localhost local]# wc access.log

2 11 66 access.log

[root@localhost local]# wc << ddy

> erwr

> erwtrt trer

> werertrt tre

> rertr

> ddy

4 6 36