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vi hello
ls
date
whoami
pwd
date;whoami;pwd
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#/bin/bash
#this script is display current user,time and path
#it is display current time
echo "current time is"
date
#it is display current user
echo "current user is"
whoami
#it is display current path
echo "current path is"
pwd
Ö´ÐÐbash hello
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ls -l
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Root ×÷ΪËùÓÐÕß  ¿´Ç°ÈýÏî rwx
Ö´ÐÐchmod u+x hello
ls -l hello
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LANG  ÓïÑÔ»·¾³
x=abc
echo x
echo $x
x=asdfsaf
echo $x
echo $SHELL
echo $PATH
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PATH=$PATH:/root
echo $hello


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