Linux ½Å±¾ÖеÄС¼¼ÇÉ
1. java ... > log.out
½«Java³ÌÐòÊä³ö ±£´æµ½ log.out Îļþ
2. java .... >>log.out
ÓëÉÏÒ»¸ö²»Í¬£¬Õâ¸öÊÇ×·¼Óµ½Îļþ£¬¶ø²»»á¸²¸ÇÔÓÐÊä³ö.
3. java .... >>log.out 2>&1
ÔÚJavaÀï(ÆäËûÓïÑÔÒ²Ó¦¸ÃÒ»Ñù), ³ÌÐòµÄÊä³ö·ÖΪ ±ê×¼Êä³öÁ÷ºÍ´íÎóÊä³öÁ÷£¬ 2>1& ÊÇÖ¸½«³ÌÐòµÄ´íÎóÐÅÏ¢Êä³öÒ²Êä³öµ½¿ØÖÆÌ¨£¬
4. $! »ñµÃ½ø³ÌºÅ
java .... &
echo $£¡
¾Í¿ÉÒÔ»ñµÃÕâ¸öjavaµÄ½ø³ÌºÅÁË
5. $? »ñµÃ·µ»ØÖµ
java.... &
echo $?
¿ÉÒÔ»ñµÃ³ÌÐòµÄ·µ»ØÖµ
Ïà¹ØÎĵµ£º
£¨L2CAPÐÒé¼ò½é£¬L2CAPÔÚBlueZÖеÄʵÏÖÒÔ¼°L2CAP±à³Ì½Ó¿Ú£©
Ò»£ºL2CAPÐÒé¼ò½é£º
Logical Link Control and Adaptation Protocol(L2CAP)
Âß¼Á¬½Ó¿ØÖƺÍÊÊÅäÐÒé (L2CAP) ΪÉϲãÐÒéÌá¹©ÃæÏòÁ¬½ÓºÍÎÞÁ¬½ÓµÄÊý¾Ý·þÎñ£¬²¢Ìṩ¶àÐÒ鹦ÄܺͷָîÖØ×é²Ù×÷¡£L2CAP ³äÐíÉϲãÐÒéºÍÓ¦ÓÃÈí¼þ´«ÊäºÍ½ÓÊÕ×î´ó³¤¶ÈΪ 64K µÄ L2CAP Ê ......
ÔµØÖ·£ºhttp://selftest.51cto.com/subread.php?sid=213
×Ô²â¼ò½é£º
ShellÒ²½Ð×öÃüÁîÐнçÃæ£¬ËüÊÇUnix/ÀàUnix²Ù×÷ϵͳÏ´«Í³µÄÓû§ºÍ¼ÆËã»úµÄ½»»¥½çÃæ¡£Óû§Ö±½ÓÊäÈëÃüÁîÀ´Ö´Ðи÷ÖÖ¸÷ÑùµÄÈÎÎñ¡£µ±È»Î¢ÈíµÄWindows²Ù×÷ϵͳҲÌṩÁËÕâÑùµÄ¹¦ÄÜ£¬ËüÃÇÊÇWindows 9XϵÄcommand.com£¬ºÍ»ùÓÚWindows NTµÄ¸ ......
Ò»£®ºËÐÄÔ´³ÌÐòµÄÎļþ×éÖ¯£º
1£®LinuxºËÐÄÔ´³ÌÐòͨ³£¶¼°²×°ÔÚ/usr/src/linuxÏ£¬¶øÇÒËüÓÐÒ»¸ö·Ç³£¼òµ¥µÄ±àºÅÔ¼¶¨£ºÈκÎżÊýµÄºËÐÄ£¨ÀýÈç2.0.30£©¶¼ÊÇÒ»¸öÎȶ¨µØ·¢ÐеĺËÐÄ£¬¶øÈÎºÎÆæÊýµÄºËÐÄ£¨ÀýÈç2.1.42£©¶¼ÊÇÒ»¸ö¿ª·¢ÖеĺËÐÄ¡£
±¾ÎÄ»ùÓÚÎȶ¨µÄ2.2.5Ô´´úÂ룬µÚ¶þ²¿·ÖµÄʵÏÖÆ½Ì¨Îª Redhat Linux 6.0¡£
2£®ºËÐÄÔ´³ÌÐò ......
#include<unistd.h>
¡¡¡¡¶¨Ò庯Êý£º
¡¡¡¡int execvp(const char *file ,char * const argv []);
¡¡¡¡º¯Êý˵Ã÷£º
¡¡¡¡execvp()»á´ÓPATH »·¾³±äÁ¿ËùÖ¸µÄĿ¼ÖвéÕÒ·ûºÏ²ÎÊýfile µÄÎļþÃû£¬ÕÒµ½ºó±ãÖ´ÐиÃÎļþ£¬È»ºó½«µÚ¶þ¸ö²ÎÊýargv´«¸ø¸ÃÓûÖ´ÐеÄÎļþ¡£
¡¡¡¡·µ»ØÖµ£º
¡¡¡¡Èç¹ûÖ´Ðгɹ¦Ôòº¯Êý²»»á·µ»Ø£¬Ö´ÐÐʧ°ÜÔ ......
¹ØÓÚread(...)·µ»ØÖµµÄÕýÈ·Åжϣºp30
File I/O µÄ read(...)º¯ÊýÓ÷¨£º
ÓÐÎÊÌâµÄ´úÂ룬ֻÅжϷµ»ØÖµÎª-1µÄÇé¿ö¡£
unsigned long word;
ssize_t nr;
/* read a couple bytes into 'word' from 'fd' */
nr = read (fd, &word, sizeof (unsigned long));
if (nr == -1)
/* error */
Indeed, a call to read( ) ca ......