Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

LinuxϵͳµÄShell I/OÖض¨ÏòÏê½â

I/OÖض¨ÏòÏê½â¼°Ó¦ÓÃʵÀý
1¡¢ »ù±¾¸ÅÄÕâÊÇÀí½âºóÃæµÄ֪ʶµÄÇ°ÌᣬÇëÎñ±ØÀí½â£©
a¡¢ I/OÖض¨Ïòͨ³£Óë FDÓйأ¬shellµÄFDͨ³£Îª10¸ö£¬¼´ 0¡«9£»
b¡¢ ³£ÓÃFDÓÐ3¸ö£¬Îª0£¨stdin£¬±ê×¼ÊäÈ룩¡¢1£¨stdout£¬±ê×¼Êä³ö£©¡¢2£¨stderr£¬±ê×¼´íÎóÊä³ö£©£¬Ä¬ÈÏÓëkeyboard¡¢monitor¡¢monitorÓйأ»
c¡¢ Óà < À´¸Ä±ä¶Á½øµÄÊý¾ÝÐŵÀ(stdin)£¬Ê¹Ö®´ÓÖ¸¶¨µÄµµ°¸¶Á½ø£»
d¡¢ Óà > À´¸Ä±äËͳöµÄÊý¾ÝÐŵÀ(stdout, stderr)£¬Ê¹Ö®Êä³öµ½Ö¸¶¨µÄµµ°¸£»
e¡¢ 0 ÊÇ < µÄĬÈÏÖµ£¬Òò´Ë < Óë 0<ÊÇÒ»ÑùµÄ£»Í¬Àí£¬> Óë 1> ÊÇÒ»ÑùµÄ£»
f¡¢ ÔÚIOÖض¨Ïò ÖУ¬stdout Óë stderr µÄ¹ÜµÀ»áÏÈ×¼±¸ºÃ£¬²Å»á´Ó stdin ¶Á½ø×ÊÁÏ£»
g¡¢ ¹ÜµÀ“|”(pipe line):ÉÏÒ»¸öÃüÁîµÄ stdout ½Óµ½ÏÂÒ»¸öÃüÁîµÄ stdin;
h¡¢ tee ÃüÁîÊÇÔÚ²»Ó°ÏìÔ­±¾ I/O µÄÇé¿öÏ£¬½« stdout ¸´ÖÆÒ»·Ýµ½µµ°¸È¥;
i¡¢ bash£¨ksh£©Ö´ÐÐÃüÁîµÄ¹ý³Ì£º·ÖÎöÃüÁ±äÁ¿ÇóÖµ£­ÃüÁîÌæ´ú£¨``ºÍ$( )£©£­Öض¨Ïò£­Í¨Åä·ûÕ¹¿ª£­È·¶¨Â·¾¶£­Ö´ÐÐÃüÁ
j¡¢ ( ) ½« command group ÖÃÓÚ sub-shell È¥Ö´ÐУ¬Ò²³Æ nested sub-shell£¬ËüÓÐÒ»µã·Ç³£ÖØÒªµÄÌØÐÔÊÇ£º¼Ì³Ð¸¸shellµÄStandard input, output, and error plus any other open file descriptors¡£
k¡¢ exec ÃüÁ³£ÓÃÀ´Ìæ´úµ±Ç° shell ²¢ÖØÐÂÆô¶¯Ò»¸ö shell£¬»»¾ä»°Ëµ£¬²¢Ã»ÓÐÆô¶¯×Ó shell¡£Ê¹ÓÃÕâÒ»ÃüÁîʱÈκÎÏÖÓл·¾³¶¼½«»á±»Çå³ý¡£exec ÔÚ¶ÔÎļþÃèÊö·û½øÐвÙ×÷µÄʱºò£¬Ò²Ö»ÓÐÔÚÕâʱ£¬exec ²»»á¸²¸ÇÄ㵱ǰµÄ shell »·¾³¡£
2¡¢ »ù±¾IO
cmd > file °Ñ stdout Öض¨Ïòµ½ file ÎļþÖУ»
cmd >> file °Ñ stdout Öض¨Ïòµ½ file ÎļþÖÐ(×·¼Ó)£»
cmd 1> fiel °Ñ stdout Öض¨Ïòµ½ file ÎļþÖУ»
cmd > file 2>&1 °Ñ stdout ºÍ stderr Ò»ÆðÖض¨Ïòµ½ file ÎļþÖУ»
cmd 2> file °Ñ stderr Öض¨Ïòµ½ file ÎļþÖУ»
cmd 2>> file °Ñ stderr Öض¨Ïòµ½ file ÎļþÖÐ(×·¼Ó)£»
cmd >> file 2>&1 °Ñ stderr ºÍ stderr Ò»ÆðÖض¨Ïòµ½ file ÎļþÖÐ(×·¼Ó)£»
cmd < file >file2 cmd ÃüÁîÒÔ file Îļþ×÷Ϊ stdin£¬ÒÔ file2 Îļþ×÷Ϊ stdout£»
cat <>file ÒÔ¶ÁдµÄ·½Ê½´ò¿ª file£»
cmd < file cmd ÃüÁîÒÔ file Îļþ×÷Ϊ stdin£»
cmd << delimiter Here document£¬´Ó stdin ÖжÁÈ룬ֱÖÁÓöµ½ delimiter ·Ö½ç·û¡£
3¡¢ ½ø½×IO
>&n ʹÓÃϵͳµ÷Óà dup (2) ¸´ÖÆÎ


Ïà¹ØÎĵµ£º

ʵսLinux Bluetooth±à³Ì(Áù) L2CAP±à³ÌʵÀý

ÀýÒ»£º·¢ËÍSignaling Packet£º
Signaling CommandÊÇ2¸öBluetoothʵÌåÖ®¼äµÄL2CAP²ãÃüÁî´«Êä¡£ËùÒÔµÃSignaling CommandʹÓÃCID 0x0001.
¶à¸öCommand¿ÉÒÔÔÚÒ»¸öC-frame£¨control frame£©Öз¢ËÍ¡£
 Èç¹ûÒªÖ±½Ó·¢ËÍSignaling Command.ÐèÒª½¨Á¢SOCK_RAWÀàÐ͵ÄL2CAPÁ¬½ÓSocket¡£ÕâÑù²ÅÓлú»á×Ô¼ºÌî³äCommand Code£¬Identi ......

ʵսLinux Bluetooth±à³Ì (Æß) SDPЭÒé

Service Discovery Protocol(SDP)ÌṩһÖÖÄÜÁ¦£¬ÈÃÓ¦ÓóÌÐòÓз½·¨·¢ÏÖÄÄÖÖ·þÎñ¿ÉÓÃÒÔ¼°ÕâÖÖ·þÎñµÄÌØÐÔ¡£
·þÎñ·¢ÏÖЭÒé(SDP»òBluetooth SDP)ÔÚÀ¶ÑÀЭÒéÕ»ÖжÔÀ¶ÑÀ»·¾³ÖеÄÓ¦ÓóÌÐòÓÐÌØÊâµÄº¬Ò⣬·¢ÏÖÄĸö·þÎñÊÇ¿ÉÓõĺÍÈ·¶¨ÕâЩ¿ÉÓ÷þÎñµÄÌØÕ÷¡£SDP¶¨ÒåÁËbluetooth client·¢ÏÖ¿ÉÓÃbluetooth server·þÎñºÍËüÃǵÄÌØÕ÷µÄ·½·¨¡£ ......

LinuxÏÂoracle 10g ÖйرÕÊý¾Ý¿â´íÎó

 Ò»´ÎÆæ¹ÖµÄÊý¾Ý¿âÆô¶¯ºÍ¹Ø±Õ¾­Àú¡£
SQL> conn / as sysdba
Connected to an idle instance.
SQL> shutdown immediate
ORA-24324: service handle not initialized
ORA-24323: value not allowed
ORA-01089: immediate shutdown in progress - no operations are permitted
SQL> conn / as sysdba
Co ......

Linux²é¿´ÏµÍ³×´Ì¬

Linux²é¿´ÏµÍ³×´Ì¬
Ô­ÎÄ:http://www.kklinux.com/html/linuxwangluojishu/linuxxitongguanliyuan/200903/13-4304.html
1¡£ÈçºÎ²é¿´ÏµÍ³µ±Ç°µÄ¸ºÔØ£¿
  
   ·½·¨£ºÊ¹Óà top ÃüÁî
   [Ç°5ÐнâÊÍ]
   µÚÒ»ÐУº¡¾ÏµÍ³¸Å¿ö¡¿µ±Ç°Ê±¼ä¡¢ÏµÍ³Æô¶¯Ê±¼ä¡¢µ±Ç°ÏµÍ³µÇ¼Óû§ÊýÄ¿¡¢Æ½¾ ......

Linux ½ø³Ì¹ÜÀí

1¡¢³ÌÐòºÍ½ø³Ì£»
³ÌÐòÊÇΪÁËÍê³ÉijÖÖÈÎÎñ¶øÉè¼ÆµÄÈí¼þ£¬±ÈÈçOpenOfficeÊdzÌÐò¡£Ê²Ã´Êǽø³ÌÄØ£¿½ø³Ì¾ÍÊÇÔËÐÐÖеijÌÐò¡£
Ò»¸öÔËÐÐ×ŵijÌÐò£¬¿ÉÄÜÓжà¸ö½ø³Ì¡£ ±ÈÈç LinuxSir.Org ËùÓõÄWWW·þÎñÆ÷ÊÇapache·þÎñÆ÷£¬µ±¹ÜÀíÔ±Æô¶¯·þÎñºó£¬¿ÉÄÜ»áÓкöàÈËÀ´·ÃÎÊ£¬Ò²¾ÍÊÇ˵Ðí¶àÓû§À´Í¬Ê±ÇëÇóhttpd·þÎñ£¬apache·þÎñÆ÷½«»á´´½¨Óжà ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ