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LinuxÊÇÒ»¸ö¶àÓû§µÄ²Ù×÷ϵͳ¡£¶àÓû§Òâζ×Åÿ¸öÓû§µÇ¼ϵͳºó£¬¶¼ÓÐ×Ô¼º×¨ÓõÄÔËÐл·¾³¡£¶øÕâ¸ö»·¾³ÊÇÓÉÒ»×é±äÁ¿Ëù¶¨Òå,Õâ×é±äÁ¿±»³ÆΪ»·¾³±äÁ¿¡£Óû§¿ÉÒÔ¶Ô×Ô¼ºµÄ»·¾³±äÁ¿½øÐÐÐÞ¸ÄÒÔ´ïµ½¶Ô»·¾³µÄÒªÇó¡£
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»·¾³±äÁ¿ÊǺÍShell½ôÃÜÏà¹ØµÄ£¬ËüÊÇͨ¹ýShellÃüÁîÀ´ÉèÖõġ£»·¾³±äÁ¿ÓÖ¿ÉÒÔ±»ËùÓе±Ç°Óû§ËùÔËÐеijÌÐòËùʹÓ᣶ÔÓÚbashÀ´Ëµ£¬¿ÉÒÔͨ¹ý±äÁ¿ÃûÀ´·ÃÎÊÏàÓ¦µÄ»·¾³±äÁ¿¡£
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1.ÏÔʾ»·¾³±äÁ¿HOME
$ echo $HOME
/home/admin
2.ÉèÖÃÒ»¸öеĻ·¾³±äÁ¿NAME
$ export NAME=”RaidCheng”
$ echo $NAME
RaidCheng
3.ʹÓÃenvÃüÁîÏÔʾËùÓеĻ·¾³±äÁ¿
$ env
HOSTNAME=test
TERM=vt100
SHELL=/bin/bash
HISTSIZE=1000
SSH_CLIENT=202.xxx.xxx.xxx 53694 22
CATALINA_BASE=/usr/local/jakarta-tomcat
SSH_TTY=/dev/pts/0
ANT_HOME=/usr/local/ant
JAVA_OPTS=-server
USER=admin

4.ʹÓÃsetÃüÁîÏÔʾËùÓб¾µØ¶¨ÒåµÄShell±äÁ¿
$ set
BASH=/bin/bash
BASH_VERSINFO=([0]=”2″ [1]=”05b” [2]=”0″ [3]=”1″ [4]=”release” [5]=”i386-redhat-linux-gnu”)
BASH_VERSION=’2.05b.0(1)-release’
CATALINA_BASE=/usr/local/jakarta-tomcat
CATALINA_HOME=/usr/local/jakarta-tomcat

5.ʹÓÃunsetÃüÁîÀ´Çå³ý»·¾³±äÁ¿
$ export NAME=”RaidCheng”
$ echo $NAME
RaidCheng
$ unset NAME
$ echo $NAME
6.ʹÓÃreadonlyÃüÁîÉèÖÃÖ»¶Á±äÁ¿
$ export NAME=”RaidCheng”
$ readonly NAME
$ unset NAME
-bash: unset: NAME: cannot unset: readonly variable
$ NAME=”New” #»á·¢ÏÖ´ËÒ²±äÁ¿²»Äܱ»ÐÞ¸Ä
-bash: TEST: readonly variable
Èý¡¢³£¼ûµÄ»·¾³±äÁ¿
PATH¡¡¡¡¡¡¡¡¡¡¡¡¾ö¶¨ÁËshell½«µ½ÄÄЩĿ¼ÖÐÑ°ÕÒÃüÁî»ò³ÌÐò
HOME¡¡¡¡¡¡¡¡¡¡¡¡µ±Ç°Óû§Ö÷Ŀ¼
HISTSIZE¡¡¡¡¡¡¡¡ÀúÊ·¼Ç¼Êý
LOGNAME ¡¡¡¡¡¡¡¡µ±Ç°Óû§µÄµÇ¼Ãû
HOSTNAME¡¡¡¡¡¡¡¡Ö¸Ö÷»úµÄÃû³Æ
SHELL ¡¡¡¡¡¡¡¡¡¡Ç°Óû§ShellÀàÐÍ
LANGUGE ¡¡¡¡¡¡¡¡ÓïÑÔÏà¹ØµÄ»·¾³±äÁ¿£¬¶àÓïÑÔ¿ÉÒÔÐ޸Ĵ˻·¾³±äÁ¿
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