小编che*_*ner的帖子

我正在尝试编写一个 shell 脚本，该脚本从用户那里获取字符串输入，询问文件名并报告该字符串是否存在于文件中。下面是我当前的脚本。

#!/bin/bash  
while :  
       do  
       echo "Please enter a string"  
       read input_string  
       echo "Please enter the file name to see if that string is present in it -  (Enter .abw after)"  
     read input_string1  
     grep -q "${input_string}" "${input_string1}"       
     if grep -q $input_string $input_string1 ; then  
         echo  "Your string has been found"    
     else   
         echo "Your string has not been found"  
      fi  
 done

当我运行脚本时，它说

Line 2: while:: command not found
Line 3: syntax error near unexpected token 'do'
Line 3: 'do' …

我看到了if语句中条件使用 a 的脚本，但$ 我不明白为什么？

if $( ssh user@host " test -e file  " ); then 
   echo "File is there"
else
   echo "We don't that file on that host"
fi