想很久不知道怎麼命名這個題目，姑且就這樣吧，應該能表達我的意思了。
主要實現：
（1）shell命令根據不同的option返回不同執行的功能，如ls -l和ls -a會輸出不同結果。
（2）在執行過程中可以讀取引數
（3）“提示選擇”，羅列所有可選項，讓呼叫者選擇
（4）適當地給出“help”幫助資訊

這裡先說明幾點
（1）select:選擇提示使用的是bash中的擴充套件改功能select，linux下預設是bash，unix中就必須顯示指定"#!/bin/bash"
（2）shift：用於把引數逐個處理掉，shfit n 把前面n個引數去掉，後面引數前移
（3）[expr]和[[expr]]：若能保證表示式中變數不會為空，兩者效果都是一樣的，但是如果有變數為空，如[$1=$className ]中$1為空，結果就是[=$className ]，是“["和$className比較，就會報語法錯誤，因為少了一個"["。

根據這些引數，我們會有不同的執行結果，這裡只是簡單的把類名或方法名按指定的次數輸出顯示，具體執行方法視需求而定，過程是一樣的。

有什麼意見或建議大家可以提出

以下是dis.sh
#!/bin/bash

classNames="Calendar DeskClock Note FileExplorer"
methodNames="CalendarMethod DeskClockMethod NoteMethod FileExplorerMethod"

#the running type,0 for class,1 for method,defalut -1
type=-1

#the runtest command
#commandTmp="adb shell uiautomator runtest SanityAccessoryTestCase.jar"
commandTmp="echo"

help()
{
cat <<HELP
NAME：dis - display the gived className or methodName  
USAGE:dis [-c className] [-c] [-m methodName] [-m] [-n num] [-h ]
ExAMPLE:dis -c Calendar -n 3
        dis -m CalendarMethod -n 3
        dis -c
        dis -h
        dis
NOTE:can not use -c and -m at the same time!
HELP
exit 0
}

testAll()
{
  echo $classNames $methodNames
  exit 0
}

#list and choose the name for testing
listClassName()
{
  echo "input the className"
  select className in $classNames;do
  break
  done
}

#list and choose the name for testing
listMethodName()
{
  echo "input the methodName"
  select methodName in $methodNames;do
  break
  done
}


#default run all testCase for one time
if [ -z "$1" ];then
testAll
else
   while [ -n "$1" ];do
     case $1 in
             -h)help;;
             -c)
                if [[ $type -eq 1 ]];then
                echo "can not set option '-c' and '-m' at the same time'";exit 1
                fi
                type=0
                # no className
                if [ -z "$2" ];then
                  listClassName
                  echo "input the frequency of running(>0):"
                  read runFrequency;shift 1
                else
                  className=$2;shift 2
                fi;;
             -n)
                 if [ -z "$2" ];then
                 echo "must appoint the frequency of running after '-n'";exit 1
                 else
                 runFrequency=$2;shift 2
                 fi;;
             -m)
                if [[ $type -eq 0 ]];then
                echo "can not set option '-c' and '-m' at the same time'";exit 1
                fi
                type=1
                # no methodName
                if [ -z "$2" ];then
                  listMethodName
                  echo "input the frequency of running(>0):"
                  read runFrequency;shift 1
                else
                  methodName=$2;shift 2
                fi;;
             *)echo "error:no such potion $1.try 'dis -h' for more information";exit 2;;
     esac
   done
        #className or methodName is valid? 0 for valid,1 for invalid
        isValid=1

        #if test class
    if [[ $type -eq 0 ]];then
          for var in $classNames;do
            if [[ $className = $var ]];then
              isValid=0
              break
            fi
          done

         if [[ runFrequency -gt 0 ]];then
           while [[ $runFrequency -ne 0 ]];do
             commandTmp=$commandTmp" $className"
             #runFrequency=runFrequency-1
             runFrequency=`expr $runFrequency "-" 1`
           done
         else
           echo "the frequency of running must >0 ";exit 3
         fi
         
        #if test method
    elif [[ $type -eq 1 ]];then
          for var in $methodNames;do
            if [[ $methodName = $var ]];then
              isValid=0
              break
            fi
          done

         if [[ runFrequency -gt 0 ]];then
          while [[ $runFrequency -ne 0 ]];do
             commandTmp=$commandTmp" $methodName"
             #runFrequency=runFrequency-1
             runFrequency=`expr $runFrequency "-" 1`
          done
         else
           echo "the frequency of running must >0 ";exit 3
         fi

    else
          echo "you need to appoint the test type,try 'dis -h' for more information";exit 4
    fi

        if [[ $isValid -eq 0 ]];then
               eval $commandTmp
    else
           echo "className or methodName is invalid,try 'dis -h' for more information";exit 4
        fi

fi