1,echo "AA" > Test.txt and Echo "BB" >> test.txt//> Empty the original file, and the content is written to the file,>> put the content to 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//Display system has been running for how long, it displays the following information in turn: The current time, how long the system has been running, the current number of users, the system in the past 1 minutes, 5 minutes and 15 minutes of the average load
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 to lowercase, echo" aadcbdc23″|tr-c b-d = Replace a string other than b-d =
31,echo "ADSF" | Iconv-f utf8-t GBK//Turn character from UTF8 to gbk-f is from and shorthand,-t like terminal shorthand
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 way is covered by the way, use caution if User A is in MySQL usermod-g php mysql such words only
It belongs to PHP,
39,USERMOD-G Group name user//This way is increased by the way that if user A is in MySQL usermod-g php mysql so, 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//file is 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
100 Common Linux Commands