Question

我对编程很新，在UNIX中编写shell脚本程序时遇到语法错误。我正在尝试创建一个数据库，允许用户在执行shell脚本后使用内置命令进行创建，删除和备份。

但是，每当使用if语句或while循环时，我都会遇到问题。更具体地说，每当我使用两者的组合时，放置“完成”或“fi”的位置，包括嵌套循环。好的，这就是它。

> #!/bin/bash
> 
> 
> echo "*****Welcome to User Administration Program*****"
>
> for ((i=0;i<3;++i))
> #for i in `seq 1 3`
> do
>
> count=`expr $count + 1`
> echo -n "Please enter adminstrative username: "
> read input
> if [ $input == admin ]; then
> break
> if [ $count -eq 3 ]; then
> break fi fi done
> 
> 
> #so far so good
> 
> echo "Welcome admin!" echo -n "[administator@shell]$ " read userin
> while [ "$userin" = "createuser" -o "$userin" = "deleteuser" -o
> "$userin" = "ba$  do
>        command1="createuser"
>          command2="deleteuser"
>          command3="backup"
> 
> if [ "$userin" = "$command1" ]; then
>         echo "Please enter a username "
>         echo -n "[administrator@shell]$ "
> 
>  read username while read line do if  [ "$username" = "$line" ]; then
> #not reading lines correctly
>         echo "$line is taken! choose another" else
>       newUser="$username"
>         echo -n "Hello $newUser ! , enter password "
>         read passEntered
>         newPass="$passEntered"
>         echo $newUser $newPass >> userdb
>         echo "Thank you for creating password, $newUser !" <"userdb" echo "Program terminated!" exit fi done
> 
> #create user works and is completed, with exception of minor error
> 
> elif [ "$userin" == "$command2" ]; then echo "Which user do you wish
> to delete?" echo -n "[administrator@shell]$ " while    read delete do
>          username=$(echo $delete | cut -d" " -f2)
>          usernameExists=$(grep -w -c $username userdb)
>          sed -i '/$username:/d' userdb
> 
> 
> 
> if [ "$delete"  == "admin" ]; then
>          echo "You do not have necessary powers to perform this action."
>         echo "Try  again!" else command=$(echo $input | cut -d" " -f1)
> 
> dir=$(echo $input | cut -d" " -f2) fi done
> 
> 
> elif [ "$userin" == "$command3" ]; then
>          echo "How do you wish to backup?" echo -n "[administrator@shell]$ " while read input do backup=true if [
> "$input" != "$BACKUP" ]; then echo "Invalid command! Try again" fi
> 
> else #where error is happening echo "Invalid command. Please Try
> again!" fi done

Answer 1

您错过了done以匹配上一个while，但您无法看到它，因为它隐藏在格式不佳的代码中。

尝试重新格式化代码，在echo语句之前添加换行符并正确缩进。

第98行：意外标记'else'附近的语法错误

1 个答案: