寻找匹配的')'时出现意外的EOF错误 [英] Unexpected EOF error while looking for matching `)'

问题描述

尝试运行bash脚本并且某些功能正常运行时，我收到以下消息:

Trying to run a bash script and while some things work correctly, I get this message:

line 34: unexpected EOF while looking for matching `)'

这是代码，我在斜边方法中标记了有问题的行:

Here's the code, I've marked the line in question (in the hypotenuse method):

#!/bin/bash
# Bash Script Calculator
# -----------------------------------------------------
# 
# 
# 
# -----------------------------------------------------

a=$1
op="$2"
b=$3

if [ $# -lt 3 ]
then
    echo "$0 num1 opr num2"
    echo "Operators: +,-,x,/"
    exit 1
fi

case "$op" in
    +) echo $(( $a + $b ));;
    -) echo $(( $a - $b ));;
    x) echo $(( $a * $b ));;
    /) echo $(( $a / $b ));;
    hyp) hypotenuse;;
    area) area;;
    *) echo "Error: Not a listed operator"
       echo "If using multiplication, use "x"";;

esac

hypotenuse()
{
    hyp=$(bc -l << EOF     #LINE 34
    scale = 9
    sqrt ( $1 * $1 + $3 * $3 )
    EOF
    )   
    echo "$hyp"
}

area()
{
    area=$(echo "scale=2;3.14 * ($a * $a)" | bc)
    echo "$area"
}

我错过了什么吗?我花了一些时间在Google上查找内容，否则，似乎没有什么可以告诉我的.

Am I missing something? I've spent a little time looking things up on Google and such, nothing seems to tell me otherwise.

感谢您的帮助！

推荐答案

您的heredoc终结符错误:

Your heredoc terminator is wrong:

{
    hyp=$(bc -l << EOF     #LINE 34
    scale = 9
    sqrt ( $1 * $1 + $3 * $3 )
    EOF
^^^^---these spaces count

您的终止符现在实际上是[space][space][space][space]EOF，而bash正在寻找EOF，而没有空格.终止符必须从行的开头开始，在行的前面(或后面)没有空格.

Your terminator is now actually [space][space][space][space]EOF, while bash is looking for EOF WITHOUT the spaces. The terminator MUST begin at the start of the line, without any whitespace before (or after) it.

由于您的Heredoc永远不会终止，因此bash会在脚本的结尾处运行，以寻找一个永远不会出现的)，因为Heredoc消耗了您实际拥有的那个.

Since your heredoc never terminates, bash will run right off the end of the script looking for a ) which never comes, because the heredoc consumed the one you actually did have.

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