如何在linux中創建一個腳本來顯示錯誤？

Question

我有下面的代碼，但每當我運行它，並輸入一個不正確的名稱，它不顯示錯誤消息，它只是空白。

#!/bin/bash 

name=$1 
if [ "$name" = "" ] 
    then echo -n "Enter a name to search for: " 
    read name 
else 
    echo "Name '$name' is not in directory" 
fi 
grep -i $name ~uli101/2015a/phonebook 

Answer 1

閱讀代碼：當$ 1不爲空時顯示「錯誤消息」。你可能想要類似

if ! grep -i "$name" ~uli101/2015a/phonebook ; then 
    echo "Name '$name' is not in directory" 
fi