Maximum limit of pipes in a single command ?

[Keshetti Mahesh]

Hi all,

Can anyone tell me what is the maximum limit of number of pipes
that can be opened through a single command ?

e.g; #  ||| .|

regards,
Mahesh

Re: Maximum limit of pipes in a single command ?

[Keshetti Mahesh]

> For what is worth, on my system (bash 3.2.33(1)-release) I can have 3332
> pipes before bash gives an error. I used this command:
>

Thanks Dave for informing.

>
> Why do you want to know?
>

I have a bash script which replaces all tokens in a large with an
identifier (an integer) by doing 'sed'
in a loop. I modified the script a little bit to concatenate all
"s//" using pipes and
ran single 'sed' at the end. But its not working. Thats why I want to
know how many pipes can I open
through a single command. Also, I have tried concatenated the replace
commands using ";". Even
that is not working.

-Mahesh

Re: Maximum limit of pipes in a single command ?

[Keshetti Mahesh]

> sed's "s" command should be terminated with a final "/".  If nothing
> comes after the "s" command, then you can leave out the final "/", but
> in your case, you need it:
> sed 's/old1/new1/;s/old2/new2/;...'
>

I followed the syntax properly.
But thats not the problem. Problem is how long can the concatenated
string can be ?

-Mahesh