#-------------------------------------
# Script:    if_example
#------------------------------------- 
echo 'word 1: \c'   # 印出訊息，等候使用者輸入 
read word1          # 將使用者的輸入放入變數 word1 

echo 'word 2: \c'
read word2
echo 'word 3: \c'
read word3
if [  "$word1" = "$word2" -a "$word2" = "$word3" ]
  then
    echo 'Match: words 1, 2, & 3'
elif [ "$word1" = "$word2" ]
  then
    echo 'Match: words 1 & 2'
elif [ "$word1" = "$word3" ]
  then
    echo 'Match: words 1 & 3'
elif [ "$word2" = "$word3" ]
  then
    echo 'Match: words 2 & 3'
else
    echo 'No match'
fi