[[PageOutline]]
= source =
{{{
man bash
}}}
= arg1 op arg2 =
{{{
a=11
test $a -lt 10
echo $?
}}}

{{{
a=$((a+1))
echo $a
}}}


= whiptail =
產生對話式選單
{{{
whiptail --menu "test" 0 0 0 a1 "test a1" a2 "test a2"
}}}
做一個選單，test a1 選項結果為 a1， test a2 選項結果為 a2

{{{
whiptail --menu "test" 0 0 0 a1 "test a1" a2 "test a2" 2> tmp
}}}
將結果標準錯誤輸出至 tmp 內