Linux introduction and Common commands 4-linux advanced commands and skills, linux4-linux

Linux introduction and Common commands 4-linux advanced commands and skills, linux4-linux

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Several Disks
Fdisk-l
Disk Space df-lh
Df-al

View the process: ps-ef "grep java
Kill process: kill-9 process no.

Filter more

More xxx | grep www.makaidong.com

 

Configure the ip address after installing linux

Vim/etc/sysconfig/network-scripts/ifcfg-eth5
IPADDR = 192.168.42.142
NETMASK = 255.255.255.0
GATEWAY = 192.168.42.1
Enable and disable Nic
Ifdown eth5
Ifup eth5
Service network restart is preferred

2: Unable to configure dns for Internet access
Vim/etc/resolv. conf

Dns

Nameserver 8.8.8.8
Nameserver 114.114.114.114
Nameserver 223.5.5.5
Nameserver 223.6.6.6

Test:
Ping www.makaidong.com

Yum Installation Software
Rpm

Yum-y install mysql

Shell Basics
#! /Bin/sh

# Print hello world in the console window
A = "hello world! Hello makaidong"
Echo "Hi, $"

"Hi, hello worlds" is not output, but "Hi," is output ,". This is because Shell treats $ as a variable, while $ as is not assigned a value, and its value is null.
The correct method is:

Echo "Hi, $ {a} s"
Echo $

Ps-aux | grep 'ambari'

Tail-f-n 200 add_run_7.sh.log
Switch to root
Sudo su-

Switch to another user
Sudo su hive

Top

Df-lh
,
Find recursive search for specific file names
Find 201412/-type f-name "*. txt"
Install

Copy wildcard
Cp-r * _ result bak/

Wordcount
Wc-l statistical wildcard

Wc-l 3_net _*/*

Root@10.251.242.59:/mnt/scp-r makaidong/

#! /Bin/sh

A = 10
B = 20

If [$ a = $ B]
Then
Echo "a is equal to B"
Fi

If [$! = $ B]
Then
Echo "a is not equal to B"
Fi
[-F "$ file"] determines that $ file is a file.
[! -F "$ file"] determines that $ file is not a file.
History low great
[$ A-lt 3] determines whether the value of $ a is less than 3. Similarly,-gt and-le indicate greater than or equal
Num1-eq num2 equals to [3-eq $ mynum]
Num1-ne num2 is not equal to [3-ne $ mynum]
Num1-lt num2 less than [3-lt $ mynum]
The num1-le num2 is less than or equal to [3-le $ mynum]
Num1-gt num2 greater than [3-gt $ mynum]
Num1-ge num2 is greater than or equal to [3-ge $ mynum]

[-N "$ a"] determines whether the variable $ a has a value. Use-z to test the Null String.

File comparison operator
[-E filename] If filename exists, it is true [-e/var/log/syslog]
-D filename if filename is a directory, it is true [-d/tmp/mydir]

-R filename if filename is readable, it is true [-r/var/log/syslog] read
-W filename if filename can be written, it is true [-w/var/. txt] write
-X filename: If filename is executable
-Z string if the string length is zero, it is true [-z "$ myvar"]
-N string if the string length is not zero, it is true [-n "$ myvar"]
String1 = string2 if string1 is the same as string2, it is true ["$ myvar" = "one two three"]
String1! = String2 if string1 is different from string2, it is true ["$ myvar "! = "One two three"]

 

While [cond1] & <||} [cond2]…; Do

...

Done

For var in ...; Do

...

Done

For (cond1; cond2; cond3) do

...

Done

Until [cond1] & <||} [cond2]…; Do

...

Done

Linux shell array creation and usage tips

Shell array + for Loop
#! /Bin/bash
For I in ip1 ip2 ip3 ip4
Do
Echo ssh root @ $ I
Echo "$ I apache service restarted"
Done
Exit

Sh-x *. sh
Shell script for generating test data
Data_create.sh
Rm-rf./data.txt
Touch data.txt
For (I = 0; I <2000; I ++ ))
Do
Str = ', name ';
Name =$ {I }$ {str }$ {I}
# Echo $ name
Echo $ name> data.txt
Done

Echo 'show testdata'
More data.txt

 

Chmod u + x data_create.sh
Run scripts
Sh-x data_create.sh

Sed replaces recursive Regular Expressions
Sed-I "s/<div class = \" c_r_a c_r_13_a \ "> <script language = \" javascript \ "> c_r_13_a (); <\/script> <\/div> // g "index.shtml

Sed-I "s/10.16.60.29/cloud1.xingtu.360.cn/g "*

Find/data-name "*"-print | xargs-I sed-I's/<div class = \ "c_r_a c_r_14_a \"> <script language = \ "javascript \"> c_r_14_a (); <\/script> <\/div> //'{}

Find *-name "*"-print | xargs-I sed-I's/<div class = \ "c_r_a c_r_14_a \"> <script language = \ "javascript \"> c_r_14_a (); <\/script> <\/div> //'{}
# Regular Expression
Find *-name "*"-print | xargs-I sed-I's/<div class = \ "c_r_a c_r _. * _ a \ "> <script language = \" javascript \ "> c_r _. * _ a (); <\/script> <\/div> //'{}

Find *-name "*"-print | xargs-I sed-I's/<div class = "c_a_tb ". * id = c_a_tb. *>. * c_a_tb. * (); <\/script> <\/div> //'{}

Find *-name "*"-print | xargs-I sed-I's/<div class = "c_a_tb ". * id = c_a_tb.>. * c_a_tb. * (); <\/script> <\/div> //'{}
9id = c_a_tb9> <script type = 'text/javascript '> c_a_tb9 (); </script> </div>

Crontab scheduled shell execution
20 * sh-x/root/start. sh> start. log 2> & 1
Remote machine ping different local machines
The local machine can be pinged to a remote device, which can be obtained as follows:
First, go to your user directory:
On the target machine: cp tmpdir. SQL .gz/home/makaidong/
Then on the local machine:
Scp-r makaidong@10.115.92.82:/home/makaidong/\ *. SQL .gz.
Note: \ * escape
Nohup
Nohup hive -- service hiveserver 2> & 1 &

Dos2unix windows-linux shell format conversion
Find.-name "*. conf" | xargs dos2unix

 

Var. sh: year = 2015

Shell import source introduces other shells
#! /Bin/bash
# In other directories: source./sh/var. sh # sh or source sh/var. sh
Source var. sh
Rm-rf./data.txt
Touch data.txt
For (I = 0; I <$ year; I ++ ))
Do
Str = ', name ';
Name =$ {I }$ {str }$ {I}
# Echo $ name
Echo $ name> data.txt
Done

Awk $ (awk-F "=" '$1 ={ print $2}

 

Compression:
Zip recursive compression folder (directory)
Zip-r./201412.zip./201412/*-r
How to compress and retain source files in Linux:
Gzip-c filename> filename.gz
How to decompress and retain source files in Linux:
Gunzip-c filename.gz> filename

Well, basically, the following four commands are commonly used:
Compressed into a gzip file:
Tar-zcvf shell.tar.gz shell/
Decompress the gzip file:
Tar-zxvf shell.tar.gz
Compress the file to bz2:
Tar-jcvf shell.tar.bz2 shell/
Decompress the bz2 file:
Tar-jxvf shell.tar.bz2

Tar-zxvf makaidong.tar.gz-C/zzz/bbs
Gunzip makaidong.tar.bz2.gz
Tar-jxvf makaidong.tar.bz2