linux multicast example

Linux wget command example Wget is a useful GNU command line tool for downloading files from the Internet. The utility can use common protocols (such as HTTP, HTTPS, and FTP) to download files from the server. It runs in the background (non-interactive) and can be used for scripts and cron jobs. GNU Wget, which is written by HrvojeNik Shiji, is currently in TimR ühsen, Darshit Shah, and Giuseppe Scrivano.

official document can be viewed here. Note: It is important to note that there is also a shared in the output of the Free-m command, but by looking at multiple hosts, this is 0, and then looking for data to confirm that the shared memory in the free command is obsolete and useless. Therefore, the view of shared memory cannot be confirmed by this item. Iv. IPCS and Ipcrm IPCs IPCS is a tool for displaying the state of interprocess communication facilities under

Linux CD commands can be said to be the most basic Linux command statements, other command statements to operate, are based on the use of the CD command.So, learn Linux commonly used commands, first of all, learn how to use the CD command techniques. 1. Command format:CD [Directory name] 2. Command function:Toggle current directory to DirName 3. Common example

Original articles, reproduced please indicate reproduced the words and sources, thank you!This gives an example of a simple socket network programming under Linux, communicates with the TCP protocol, listens on the server, sends the data to the client after receiving the client's connection, and the client prints and closes after receiving the data. There are detailed instructions in the program, in which t

Transferred from: http://blog.csdn.net/kikilizhm/article/details/7858405This gives an example of a simple socket network programming under Linux, communicates with the TCP protocol, listens on the server, sends the data to the client after receiving the client's connection, and the client prints and closes after receiving the data. There are detailed instructions in the program, in which the specific struct

together by columns; Cat File112 Cat File2ColinBook Paste File1 file21 Colin2 bookThe default delimiter is a tab character, and you can use the-D to indicate the delimiterPaste File1 file2-d ","1,colin2,book WC statistic line and character tools Wc-l File//statistic line numberWc-w File//statistics number of wordsWc-c file//Statistics character count Sed text replacement weapon First place replacementSeg ' s/text/replace_text/' file//replace the first matching text of each lineGlobal sub

3 int, sirugo);Command line: insmod Xxx.ko a = 105. Symbol Export① if a function or global variable in a kernel module wants to be used by another module, it must be exported② kernel symbol export using macrosExport_symbol (symbol name)EXPORT_SYMBOL_GPL (symbol name)Note: Where EXPORT_SYMBOL_GPL can only be used for modules that contain GPL licenses6. Kernel Module Simple Example① Module Code:#include staticint hello_init () { PRINTK (kern_warni

directly after the '/extension_dir ' search, found after this may be:Extension_dir = "./"To be modified to:Extension_dir = "/var/www/php/lib/php/extensions/" (note where the so file is located)extension=openssl.so (so module file name)Last Save exit! : wq!Then you restart the Apache server! (there is said that people do not, but also a command, I think the configuration is good to restart or peace of mind!) ）You can use the command to view the next PHP run load:/var/www/php/bin/php-m|grep OpenS

the same name, the GCC command takes precedence over the dynamic library.Fifth step: Execute.Ld_library_path=. ./mainExample five viewing files in a static library[Email protected] lib]# ar-t libhycu.abase64.c.obinbuf.c.ocache.c.ochunk.c.ocodec_a.c.o...xort.c.o[Email protected] lib]#[Email protected] lib]# Ar-tv libhycu.arw-r--r--0/0 7220 Jul 19:18 BASE64.C.Orw-r--r--0/0 2752 Jul 19:18 BINBUF.C.Orw-r--r--0/0 19768 Jul 19:18 CACHE.C.O...rw-r--r--0/0 4580 Jul 19:18 XORT.C.O[Email protected] lib]#

Linux If the firewall is just installed when we commonly used port is not added, that is, can not access, then how to add the common port to the firewall through the state, the following we take 80 port as an example. Recently I was learning Linux. Build a LNMP environment. Everything is fine during the test. Then restart Lin