Linux-shell

Shell type:
/bin/sh
/bin/bash(default shell)
/bin/ksh
/bin/tcsh(C shell)
/bin/csh
/bin/zsh

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~/.bash_history=>
after user logout the history command writed in.

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type=>
查詢指令為內部指令(builtin)或是外部指令(file)或是alias
-t-> query "name" type
-p-> if name is command will display fullpath name
-a-> list all match "name" command

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entry command => command option parameter

echo,unset=>
$name-> dispaly name content
ex:
name = 1234
echo $name
1234
unset -> cancel $name
Tips
'command' -> 表示可執行的指令
\-> 跳拖字元
export -> 使變數變成環境變數

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