Practical Use of Linux (1)

1: HOST fun: Host can be used to query domain names, but it can get more information. Host-t mx linux.com can query the MX record of Linux.com and the Host Name of the Mail processing host. Host-l linux.com returns all domain names registered under linux.com. Host-a linux.com displays all domain names of the host.

2: Find the file required by the command. Maybe you want to find out what other related files and commands a command uses? Try ldd. For example, ldd traceroute, the returned result will be libc. so.6, lid-linux.so.2 Z & j, q

3: timed! Timed! Do you want regular processing? You certainly want to make it easier! Crontab can wait for your instructions. Enter crontab-e in the command line and enter 0 5 *** wget-t3-I/home/tom/URLs-N. In this way, the wget command will be run at every morning. The first five parameters are time parameters: the number of hours, days, months, and weeks. You can run the command line here at 5 every Saturday and Sunday. You need man 5 crontab for more detailed explanation. To put it simply, wget is a small program for retrieving web pages. Current time displayed on the top of the console: AT/etc/bashrc or ~ /. Add the environment variable PROMPT_COMMAND to bashrc. Export PROMPT_COMMAND = 'echo-ne "33733 [2; 999r33 [1; 1H33 [00; 44m33 [K" 'date' "33 [00m338 "'

4: You can use up to 23 virtual terminals (VT). Suppose you have 6 files now, and add g in the format of/etc/inittab. | tqq oSl8

8: 234: respawn:/sbin/getty 38400 tty8

24: 234: respawn:/sbin/getty 38400 tty24

Skip VT7 because X uses this terminal. Then telinit q is used to reload the configuration file. Use the left Alt + Fn to switch between 1-6 and 8-12 parts, and the right Alt + Fn key to switch between 13-24 parts.

5: Console switch: Left Alt-direction key, and switch console cyclically. The effect is the same as that of Alt + Fn.

6: simple Dos to Unix: if there is a nasty Ctrl-M at the end of each line in your text file, use this command to quickly solve the problem sed's/^ M // 'filename> newfilename 32

7: quickly create an MP3 player list: find/mnt/cdrom-name *. mp3-print> cd1.play. list. in this way, all MP3 files in CDRom will be created with the name cd1.play. list file. Then you can use xmms or x11amp to play the video.

8:/important information in proc cat/proc/cpuinfo-CPU

Cat/proc/interrupts-interrupt

Cat/proc/ioports-device IO port

Cat/proc/meminfo-memory information (I. e. mem used, free, swap size)

Cat/proc/partitions-all partitions of all devices

Cat/proc/pci-PCI device information

Cat/proc/swaps-information about all Swap partitions

Cat/proc/version-Linux version Y