[英]Writing A Fish Shell Script With an Optional Argument
I have a fish shell script whose default behavior is to send an email when complete. 我有一个fish shell脚本,其默认行为是在完成后发送电子邮件。 I'd like to modify it to respond to a
nomail
argument from the command line. 我想修改它以响应命令行中的
nomail
参数。 So, for example, running the script normally would produce an email: 因此,例如,正常运行脚本会生成一封电子邮件:
michaelmichael: ~/bin/myscript
But if run with the nomail
switch, it wouldn't send the confirmation email: 但如果使用
nomail
开关运行,它将不会发送确认电子邮件:
michaelmichael: ~/bin/myscript nomail
If I run the script with the nomail
argument, it runs fine. 如果我使用
nomail
参数运行脚本,它运行正常。 Without nomail
, $argv
is undefined and it throws an error. 没有
nomail
, $argv
是未定义的,它会抛出错误。 I've scoured the fish shell documentation, but can't seem to find anything that will work. 我已经搜索了鱼壳文档,但似乎找不到任何可行的东西。 Here's what I have so far
这是我到目前为止所拥有的
switch $argv
case nomail
## Perform normal script functions
case ???
## Perform normal script functions
mailx -s "Script Done!"
end
Running this throws the following error: 运行此命令会引发以下错误:
switch: Expected exactly one argument, got 0
Obviously it expects an argument, I just don't know the syntax for telling it to accept no arguments, or one if it exists. 显然它需要一个参数,我只是不知道告诉它不接受任何参数的语法,或者它是否存在的语法。
I'm guessing this is pretty basic, but I just don't understand shell scripting very well. 我猜这是非常基本的,但我只是不太了解shell脚本。
Wrap your switch
statement like this: 像这样包装你的
switch
语句:
if set -q argv
...
end
Also, I think your default case should be case '*'
. 另外,我认为你的默认情况应该是
case '*'
。
If you prefer using switch statement it's also possible: 如果您更喜欢使用switch语句,那么它也是可能的:
switch (echo $argv)
case nomail
## Perform normal script functions
case '*'
## Perform normal script functions
mailx -s "Script Done!"
end
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