A loop that adds 1 every time 3

[Acr111]

Hey guys, I'm relatively new to Unix Scripting hence the straight forward question.

I'm trying to write a loop that will output a number each time you want it too. All I seem to able to do is create a loop that will output an infinite stream of numbers that doesn't stop. For example I have a function insertlinefunction(), and when I call that function I want it to output a number '1:' , then the next time I call it, it will output '2:' etc.. So what i'm saying is that I want to be able to display a single number starting from one and increase by one each time I call the function. At the moment when I call the function it will output all of the numbers at the same time:
1:
2:
3:
4:
etc..
Hope that makes sense.

Thanks

 

[feherke]

Hi

All I seem to able to do is create a loop that will output an infinite stream of numbers that doesn't stop.

Please post your code so we can suggest fix(es) to the syntactical and/or conceptual mistakes.

In meantime this is what I would do :

[COLOR=darkgoldenrod]insertlinefunction()[/color] { echo [green][i]"$((nr++)):"[/i][/green][teal];[/teal] }

Tested with [tt]bash[/tt] and [tt]mksh[/tt].


Feherke.

http://free.rootshell.be/~feherke/

 

[Acr111]

Thanks! That worked. However is it possible for it to start at 1 instead of 0? Also once I call the function, I'm trying to make it possible to insert text onto the line. Eg if I am up to line '5:' I'm trying to be able to insert text onto that line through using another function.

Cheers

 

[feherke]

Hi

However is it possible for it to start at 1 instead of 0?

[ul]
[li]The simplest way is to initialize the $nr variable with whatever number you want, before first calling the function.

[highlight][navy]nr[/navy][teal]=[/teal][purple]1[/purple][teal];[/teal][/highlight] [COLOR=darkgoldenrod]insertlinefunction()[/color] { echo [green][i]"$((nr++)):"[/i][/green][teal];[/teal] }

[/li]
[li]The compact way is to use pre-increment operator instead.

[COLOR=darkgoldenrod]insertlinefunction()[/color] { echo [green][i]"$(([highlight]++[/highlight]nr)):"[/i][/green][teal];[/teal] }

[/li]
[/ul]

I'm trying to make it possible to insert text onto the line.

[ul]
[li]Then simple way is to tell [tt]echo[/tt] to spare the newline character at the end of string.

[COLOR=darkgoldenrod]insertlinefunction()[/color] { echo [highlight]-n[/highlight] [green][i]"$((nr++)):"[/i][/green][teal];[/teal] }

[COLOR=darkgoldenrod]insertlinefunction()[/color] { echo [green][i]"$((nr++)):[/i][/green][lime][i][highlight]\c[/highlight][/i][/lime][green][i]"[/i][/green][teal];[/teal] }

[/li]
[li]The compact way is to pass the additional text as parameter to the function.

[COLOR=darkgoldenrod]insertlinefunction()[/color] { echo -n [green][i]"$((nr++)): [highlight]$@[/highlight]"[/i][/green][teal];[/teal] }

[/li]
[/ul]


Feherke.

http://free.rootshell.be/~feherke/

 

[KenCunningham]

Star to Feherke for going the extra couple of miles/kilometres!

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