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ÓÃÃüÁî whereis java¾Í¿ÉÒÔ¿´µ½ÁË
eg:
-bash-3.1$ whereis java
java: /usr/bin/java /etc/java /usr/lib/java /usr/share/java /opt/jdk1.6.0_01/bin/java

Èç¹û½ö½öÏëÖªµÀjavaÖ´Ðз¾¶ÔÚÄÇÀïµÄ»° ÓÃwhich java¾Í¿ÉÒÔÁË
eg:
-bash-3.1$ which java
/usr/bin/java


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¼ÙÉèÄúÕýÔÚ‘/usr/src/linux/Documentation’Ŀ¼ÏÂËÑË÷´ø×Ö·û´®‘magic&rs ......

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1.SIGHUPÐźÅ
     UNIXÖнø³Ì×éÖ¯½á¹¹Îª session (»á»°)°üº¬Ò»¸öǰ̨½ø³Ì×é¼°Ò»¸ö»ò¶à¸öºǫ́½ø³Ì×飬һ¸ö½ø³Ì×é°üº¬¶à¸ö½ø³Ì¡£Ò»¸ösession¿ÉÄÜ»áÓÐÒ»¸ösessionÊ×½ø³Ì£¬¶øÒ»¸ösessionÊ×½ø³Ì¿ÉÄÜ»áÓÐÒ»¸ö¿ØÖÆÖÕ¶Ë¡£Ò»¸ö½ø³Ì×é¿ÉÄÜ»áÓÐÒ»¸ö½ø³Ì×éÊ×½ø³Ì¡£½ø³Ì×éÊ×½ø³ÌµÄ½ø³ÌIDÓë¸Ã½ø³Ì×éIDÏàµÈ¡£Õâ ......

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1. ´´½¨Ä¿Â¼
     mkdir
     NO1. ÔÚµ±Ç°Â·¾¶´´½¨Ò»¼¶Ä¿Â¼
          [root@rehat root]# mkdir test
     NO2. ÔÚµ±Ç°Â·¾¶´´½¨¶à¼¶Ä¿Â¼
          [roo ......

LinuxÓû§Óë×é¹ÜÀí

1. Ôö¼ÓÓû§Õʺŗ—useradd / adduser
ÔÚÃüÁîÐÐÏÂʹÓà useradd ÃüÁ 
useradd Óû§Ãû 
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1£©ÔÚ /etc/passwd ÎļþÖÐÔöÌíÁËÒ»ÐмǼ£»
2£©ÔÚ /home Ŀ¼Ï´´½¨ÐÂÓû§µÄÖ÷Ŀ¼£¬²¢½« /etc/skel Ŀ¼(skeleton:.bashrc, .bash_history, etc.)ÖеÄÎļþ¿½±´µ½¸ÃĿ¼ÖÐÈ¥£»µ«ÊÇÊ ......

linux /proc/loadavg Îļþ½éÉܼ°Ó¦ÓÃ

¸ÃÎļþÖеÄËùÓÐÖµ¶¼ÊÇ´ÓϵͳÆô¶¯¿ªÊ¼ÀۼƵ½µ±Ç°Ê±¿Ì¡£¸ÃÎļþÖ»¸ø³öÁËËùÓÐCPUµÄ¼¯ºÏÐÅÏ¢£¬²»Äܸóöÿ¸öCPUµÄÐÅÏ¢¡£
[root@localhost ~]# cat /proc/loadavg
4.61 4.36 4.15 9/84 5662
ÿ¸öÖµµÄº¬ÒåΪ£º
²ÎÊý ½âÊÍ
lavg_1 (4.61) 1-·ÖÖÓÆ½¾ù¸ºÔØ
lavg_5 (4.36) 5-·ÖÖÓÆ½¾ù¸ºÔØ
lavg_15(4.15) 15-·ÖÖÓÆ½¾ù¸ºÔØ
nr_run ......
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