Linux 在 Shell 脚本 (csh shell) 中声明用户定义的变量
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Declaring User Defined Variable in Shell Scripting (csh shell)
提问by Elpezmuerto
I am trying to learn shell scripting and trying to create a user defined variable within the script, first:
我正在尝试学习 shell 脚本并尝试在脚本中创建一个用户定义的变量first：
howdy="Hello $USER !"
echo $howdy
However, when I execute the script (./first) I get this:
但是，当我执行脚本 ( ./first) 时，我得到了这个：
howdy=Hello aaron!: Command not found.
howdy: Undefined variable.
What am I doing wrong?
我究竟做错了什么？
采纳答案by andcoz
You have two errors in you code:
您的代码中有两个错误：
- you are using sh syntax instead of csh one to set the variable
- you are not escaping the "!" character (history substitution)
- 您正在使用 sh 语法而不是 csh 语法来设置变量
- 你没有逃避“！” 字符（历史替换）
Try this:
尝试这个：
#!/bin/csh
set howdy="Hello $USER \!"
echo $howdy
回答by Aaron Digulla
cshexpects that you setvariables. Try
csh期望你set变量。尝试
set howdy="Hello $USER"
echo $howdy
回答by codaddict
You are doing
你在做
howdy=''Hello $USER !''
You need to enclose the string in double quotes as:
您需要将字符串括在双引号中，如下所示：
howdy="Hello $USER !"
You seem to be using two single quotes in place of a double quote.
您似乎使用两个单引号代替双引号。
