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Question

我发誓我每天都能听到，对不起，如果我开始成为一个讨厌的人，无论如何这里有一些代码示例：

例如计划 "Ask Name"

if [ [=11=] -eq 0 ] || [ [=11=] -eq  ]
then
      if [ $# -eq 0 ]
      then
           echo "Sir I insist, I must know your name"
           read 
      fi   
      #[the long code for if the number of arguments =1 goes here!!]
      #the long code isn't important just imagine some fancy code here
      #fancy code
      #more fancy code
fi

基本上我只是想要它，以便在 if 语句之后用户可以以某种方式修改参数的数量，然后继续执行脚本的其余部分。

目前用户只需要不断地输入一些东西并且它永远不会停止，很可能是因为“$1”作为变量不起作用。

虽然我问这个的主要原因是找出是否有办法摆脱 if 语句并继续执行程序，即使输入的参数符合特定条件。

如果你不明白我的意思，再举一个例子：

#takes name as argument
if [  == "dave" ]
then
    echo "I don't like people called Dave, give me another name"
    [SOMETHING HERE THAT MAKES  THIS INPUT, NOT SURE ABOUT 'read ']
else 
    echo "Your name is cool, come inside!"
fi

这个例子有点糟糕，但我基本上想要它，这样用户就可以从回显消息中继续代码，尽管被称为 Dave。

一如既往，我很感激任何建议。

[在标题中我提到了重复]

我基本上指的是不必复制所有其他代码并将其放在两个不同的 if 语句下。这是我目前唯一能想到的解决方案。

Answer 1

如果我正确理解你的问题，而不是 IF 语句，学习如何使用 case 可能会更好。 example 个案例：

space=`df -h | awk '{print }' | grep % | grep -v Use | sort -n | tail -1 | cut -d "%" -f1 -`

case $space in
[1-6]*)
  Message="All is quiet."
  ;;
[7-8]*)
  Message="Start thinking about cleaning out some stuff.  There's a partition that is $space % full."
  ;;
9[1-8])
  Message="Better hurry with that new disk...  One partition is $space % full."
  ;;
99)
  Message="I'm drowning here!  There's a partition at $space %!"
  ;;
*)
  Message="I seem to be running with an nonexistent amount of disk space..."
  ;;
esac

如果我们使用您的第二个示例：

case  in
dave)
  echo "I don't like people called Dave, give me another name"
  ;;
*)
  echo "Your name is cool, come inside!"
  ;;
esac

Answer 2

您似乎在寻找 set 命令：

if [ $# -eq 0 ]; then
    echo "Sir I insist, I must know your name"
    read name
    set -- "$name"
fi
if [ $# -eq 1 ]; then
    # This is guaranteed to be true if $# was originally 0
    # It won't be true if the user original provided 2 or more arguments.
fi

if [ "" = "dave" ]
then
    echo "I don't like people called Dave, give me another name"
    read name
    shift  # discard the original first argument
    set -- "$name" "$@"
else 
    echo "Your name is cool, come inside!"
fi

Bash - 如何使程序继续使用 if 语句而不是重复代码？

Bash - How to make a program continue on with an if statement rather than having to duplicate code?

arguments

if-statement

continue