Re: bash leaks sh-np-NNN files and pipes in /tmp/ when command substitution is used

[Yuri]

On 12/11/2013 07:20, Ryan Cunningham wrote:
> Second, you should post the definition of 'do-filter', if 'do-filter' is not a 
> binary (also post the definitions of other custom functions 'do-filter' calls; 
> but do not post the complete script).

do-filter is some shell script running some other commands. I didn't 
think it mattered for this purpose. But in any case, it is one line 
script placed in a file and made executable:
gawk '{ print strftime("%Y-%m-%d %H:%M:%S"), $0; }'

> Also, as a correction to your original message, a FIFO _is_ a file, just not a 
> regular file.

Yes, it is a special kind of file, but it has a special type S_IFIFO and 
ls(1) shows it with 'p' type and it also has size=0. What was my point 
is that this FIFO is sometimes created as a proper FIFO:
prw-------   1 yuri   wheel          0 Dec 11 01:51 sh-np-1386834327
and sometimes as a regular (non-FIFO) file:
-rw-r--r--   1 yuri   wheel    3721815 Dec 11 02:00 sh-np-1386805482
And the code shows that only mkfifo(2) is used. (FIFO doesn't leave any 
persistent data when abandoned, but those files do leave data.) I am not 
sure why is that that it creates them as files? Doesn't it look strange?

Yuri