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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
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HISTSIZE ¡¡¡¡¡¡¡¡ÀúÊ·¼Ç¼Êý
LOGNAME ¡¡¡¡¡¡¡¡µ±Ç°Óû§µÄµÇ¼Ãû
HOSTNAME¡¡¡¡¡¡¡¡Ö¸Ö÷»úµÄÃû³Æ
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LANGUGE ¡¡¡¡¡¡¡¡ÓïÑÔÏà¹ØµÄ»·¾³±äÁ¿£¬¶àÓïÑÔ¿ÉÒÔÐ޸Ĵ˻·¾³±äÁ¿
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