Linux Common commands Daquan 100 article

1,echo "AA" Test.txt and echo "BB" "test.txt
The original file is emptied and the content is written to the file, and the content is placed at the end of the file

2,chmod go+w-r/home/zhangy//Add Write permission to group users and other users

3,TAR-TZVF test.tar.gz//List archived content

4,du-ah//view file list size

5,du-sh//View total size of all files

6,echo ' 1+2 ' |bc-l//mathematical operations

7,UNAME-A//View some information about the Linux kernel, etc.

8,badblocks-s/DEV/SDA//bad path scan shows progress

9,time command//View the run time of the commands

10,LS-LRT//In reverse order by time

11,rsync-p//Show progress while synchronizing

12.history-c//Clear History command

13,CD-//return to last directory

14,tree//Display directory tree

15,umount-n/mnt/hda2//forced unload

16,echo ~///Display the user's home directory

17,echo $[5*5]//arithmetic operations

18,echo $ ((5*5))//arithmetic operations

19,eval ls;ps aux|grep httpd//These two commands can be executed

20,FREE-M//have MB display memory

21,uptime
Shows how long the system has been running, which in turn displays the following information: The current time, how long the system has been running, how many users are currently logged in, the average load of the system in the last 1 minutes, 5 minutes, and 15 minutes

22, addition operation

[[email protected] mytest]# let a=34+3;

[Email protected] mytest]# echo $a;

23,export//View all environment variables

24,echo $PATH//view a single variable

25,CMP file1 file2//file content comparison

26,clear//Clear screen

27,echo 23423 |awk--re-interval '/[0-9]{3,}/'//If not added Re-interval, do not show

28,cal//Get a neat calendar format

29,wc-l//Count rows, wc-w statistical words

30,echo "AaDCbd23" |TR "[A-Z]" "[A-z]" uppercase lowercase, echo "AaDCbdc23" |tr-c b-d =
Replace a string other than b-d with =

31,echo "ADSF" | Iconv-f utf8-t GBK//Turn character from UTF8 to GBK
-F is the from and shorthand,-t seems to be a shorthand for terminal

32,cat-n File//content is displayed in front of the line number

33,chattr +i File//read-only, root user cannot modify it

34,lsattr File//View files Properties

35,CAT/ETC/PASSWD |awk-f: ' {print $} '//View all users in the system

36,cat/etc/group//View all groups in the system

37,groups//Pre-check the current user's location, all groups

38,USERMOD-G Group name User//This method is overridden in a way that uses the time to be careful if User A is a sex in MySQL usermod-g php
MySQL, that's just PHP.

39,USERMOD-G Group name user//This way is increased by the way if user A is in MySQL usermod-g php
MySQL in this case, MySQL belongs to 2 groups.

40,BC//Enter into the mathematical calculation

41,umask 003 U permission is 7,g permission is 7, other user is 4, that is 774,777-003=774

42,MKFS-T VFAT/DEV/HDA6//format a partition in the removable hard drive into VFAT format

43,mount/dev/cdrom/media/cdrom//Mount CDROM

44,getent Group 532//through group ID, to find groups information

45,last//Login Successful user record

46,LASTB//Login unsuccessful user record

47,dump-s/dev/sda2//Check the capacity you want to back up the/dev/sda2

48,dump-0j-f/dev/hda2/sda2_bak.dump.bz2/dev/sda2//sda2 to be backed up and compressed

49,restore-t-f/dev/hda2/sda2_bak.dump//view backup information

50,restore-r-f/dev/hda2/sda2_bak.dump//restore Backup

51,fc-list//viewing fonts installed in the system

52,find. /-type f-exec grep-q "root" {}; -exec echo {};
Find the string contained in the file under the directory

53,vmstat 5//5 display System Information, CPU,MEMORY,I/O, etc.

54,top after SHIFT + P in the order of the process display

55,top after SHIFT + M in memory-based sort display

56,IPTRAF-G//View traffic for each interface

57,ostat-d-x/dev/sda2 2//Use Iostat to see disk I/O for disk/dev/sda2, refreshed every two seconds

Paste-sd ' | | | n ' test//files are converted to 1 lines per 4 lines, separated by |

59,lsof-i: 22//Know what program is running on Port 22 now

60,LSOF-C ABC//SHOW ABC process now open file

61,lsof-p 12//See which files the process with process number 12 opens

63,route//View routing information

64,ifup//Turn on the network card

65,ifdown//Turn off the network card

66,route del-net 172.168.0.0 netmask 255.255.0.0 dev eth0//delete
172.168 this network segment

67,route add-net 172.168.10.0 netmask 255.255.255.0 dev eth0//Add a route

68,NETSTAT-TUNL//List the network service ports that are listening

69,netstat-tun//List Connected Network service ports

70,NMAP-SP 172.30.4.0/24//How many users are operating on my console in this network segment, a good security check tool

71,vgdisplay//viewing available space in the system

72,lvextend-l+20g/dev/tank/part1//Add 20G of space to the Part1 partition

73,lvresize-l-10g/dev/tank/part2//To part2 this partition to reduce the space of 10G

74,pvdisplay//View disk information

75,mplayer-loop 10/mnt/song/music/flowers open. mp3//Cycle 10 times

76,pacman-s firefox-nd//nd Remove Dependency

77,wget-c//Breakpoint Download

78,chroot/mnt/ubuntu//Change root directory to/mnt/ubuntu

79,ctrl+a//Command line, cursor is called to start

80,ctrl+e//command line, cursor movement end

81,cut-d:-F 1-4 Test//used: Split file, take split 1-4 columns

82,file/home/zhangy/test.php//To view some basic information about a file

83,touch test.txt//Create an empty file Text.txt

84,htpasswd-cbd/usr/local/nginx/conf/authfile//Create an Access control file

85,DF//view disk space, and current number of disks

86,fdisk-l//View all disks

87,alsamixer//After entering, the M key can be used for mute

88,killall httpd//Kill all httpd processes

89,killall-9 Mysqld_safe//Some process Superuser also can't stop,-9 is forced to delete

90,mirror/mysql//Download MySQL directory

91,mirror-r/mysql//upload MySQL directory

92,rmmod PCSPKR//Turn off tab beep

93,modprobe PCSPKR//Turn on tab beep

94,gpasswd-a zhangy Wheel//Add zhangy This user to wheel this group

95,dd If=/dev/zero of=/virtual/ubuntu.virt.img bs=1m count=4096
Create an IMG image of 4G

96,lspic//Display PCI device

97,LSUSB//Display USB device

98,history | Less//less root more a little bit like, feel more comfortable point

99,ln-s//If you forget-s becomes a hard link

100,tar zxvf test.tar.gz-c/home/zhangy//extract content to the specified directory

The above is the XP system download compiled compiled Linux command Daquan, hope to help everyone.

Linux Common commands Daquan 100 article