6

I want to write an alias as such:

alias add="java -jar vc.jar name"

Is there a way I can use a wildcard for name and thus only have to type: add name - with name being any name of my choice? name being an argument.

  • Note that you should probably use an absolute path rather than the relative vc.jar, otherwise your alias will only work when invoked from a specific location. – Aaron Sep 26 '18 at 12:25
5

I think you are looking for functions.

 function add() {
   local name="$1"
   java -jar vc.jar "${name}"
 }

Add this to your ~/.bashrc or ~/.profile and just call like this;

user@host$ add samplename

Alternatively you can trigger an alias expansion by adding a space or tab character at the end of the alias definition.

alias add='java -jar vc.jar '

(Note the space at the end of definition).

Then just call it normally;

user@host$ add samplename

It should work.

EDIT: As pointed out by @kusalananda you can omit the space and it will still work just fine.

  • 5
    The space at the end of the alias should not be needed. – Kusalananda Sep 26 '18 at 5:13
  • 4
    The space at the end of the alias is to trigger alias expansion of the next word. In foo bar, if foo is an alias ending with space, then bar is also checked for alias expansion. – muru Sep 26 '18 at 5:27
  • They refer to wildcards in the question, which hints at filename expansion. Assuming that's what they intend to use, it's worth noting that the function here only uses its first argument, i.e. add *.txt just uses the first matching filename. – ilkkachu Sep 26 '18 at 12:10
  • Adding the function above works, adding a space at the end of the line works as well..Thanks! – cdhdds Sep 26 '18 at 14:09
  • If that works please mark as the answer for reference of others – cevhyruz Sep 28 '18 at 1:57
4

You can try to remove the name flag and set an alias for java -jar vc.jar.

What you want to do:

alias add="java -jar vc.jar"

You now have set an alias. To run it:

add nameofsomethingyouwant

You could also try it with @cevhyruz's solution, but I think this one is simpler.

  • What's the su for? – Kusalananda Sep 26 '18 at 9:27
  • @Kusalananda I don't really know, I just always have super user on my when I'm working in a terminal. Maybe if your permissions are not default, this could help or something. You don't have to do the su part. It's just a habit of me. – Sam Sep 26 '18 at 9:33
  • 1
    Um, you have a habit to work as root in the terminal?! – Kusalananda Sep 26 '18 at 9:33
  • @Kusalananda yup, always root – Sam Sep 26 '18 at 9:39
  • 9
    There is absolutely no reason to change into root to run a Java program. Habitually working at an interactive root shell is not a practice that I would condone. – Kusalananda Sep 26 '18 at 9:46

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