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$ echo $HOME
/home/lqm
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$ export HELLO=”Hello!”
$ echo $HELLO
Hello!
3.3 ʹÓÃenvÃüÁîÏÔʾËùÓеĻ·¾³±äÁ¿
$ env
SSH_AGENT_PID=1875
HOSTNAME=lqm
SHELL=/bin/bash
TERM=xterm
HISTSIZE=1000
……
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$ set
BASH=/bin/bash
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TEST=test
$ unset $TEST
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