Linux Common Command Usage 100

Here are 100 uses, what's wrong, and please correct me.

1,echo "AA" > Test.txt and Echo "BB" >> test.txt//> Empty the original file and write the contents to the file,>> place the content at the end of the file

2,chmod go+w-r/home/zhangy//To add Write permissions to group users and other users

3,TAR-TZVF test.tar.gz//listing of 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 Linux kernel and so on

8,badblocks-s/DEV/SDA//Bad Channel scan show progress

9,time command//view run time

10,LS-LRT//reverse ORDER by time

Show progress when 11,rsync-p//sync

12.history-c//Clear History command

13,CD-//back to last Catalog

14,tree//Display directory tree

15,umount-n/mnt/hda2//Forced Uninstall

16,echo ~///display user's home directory

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

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

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

20,free-m//MB per unit display memory

21,uptime//Shows how long the system has been running, which displays the following information in turn: How much time is now, how long the system has been running, how many users are currently logged in, the system's average load in the last 1 minutes, 5 minutes, and 15 minutes

22, addition operation

[Root@krlcgcms01 mytest]# let a=34+3;

[Root@krlcgcms01 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, not shown

28,cal//Get a neat calendar format

29,wc-l//Statistic line number, wc-w statistic words

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

31,echo "ADSF" | Iconv-f utf8-t GBK//convert character from UTF8 to gbk-f is from and shorthand,-t as if terminal

32,cat-n File//content will show line number before

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 on the system

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

37,groups//check before current user, all groups

38,USERMOD-G Group name user//This way is to cover the way, use the time to be careful if the user A is sex in MySQL usermod-g php mysql so only

Belongs to PHP,

39,USERMOD-G Group name User//This is the way to add, if User A is in MySQL usermod-g php mysql in this way, MySQL belongs to 2 groups

40,BC//into the mathematical calculation

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

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

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

44,getent Group 532//The group ID is used to find the 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/dev/sda2

48,dump-0j-f/dev/hda2/sda2_bak.dump.bz2/dev/sda2//Backup and compress sda2

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//View the fonts installed in the system

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

53,vmstat 5//per 5 display of the system information, CPU,MEMORY,I/O, etc.

54,top the sort display of the process after the SHIFT + P occupies

Sort display of memory after 55,top in Shift + M

56,IPTRAF-G//View the flow of each interface

57,ostat-d-x/dev/sda2 2////Iostat View disk I/O for disks/dev/sda2, refresh once every two seconds

Paste-sd ' | | | n ' Test//file is converted to 1 lines per 4 lines and separated by |

59,lsof-i: 22//Know what program the 22 port is running now

60,LSOF-C ABC//show the files that the ABC process now opens

61,lsof-p 12//See which files are open for process number 12

63,route//View routing information

64,IFUP//Open Network card

65,ifdown//Turn off the NIC

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 of listening Network service ports

69,netstat-tun//List of connected Network service ports

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

71,vgdisplay//View free space in the system

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

73,lvresize-l-10g/dev/tank/part2//Part2 This partition to reduce 10G of space

74,pvdisplay//View disk information

75,mplayer-loop 10/mnt/song/music/flowers opened. mp3//Loop play 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 call to start

80,ctrl+e//Command line, cursor move end

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

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 access control files

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

86,fdisk-l//View all disk count

87,alsamixer//Enter, the M key can be mute

88,killall httpd//Kill all httpd processes

89,killall-9 Mysqld_safe//Some process superuser will not 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 a 4G img image

96,lspic//Display PCI devices

97,LSUSB//Display USB device

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

99,ln-s//If forgot-s becomes a hard link

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