14 Jul
2003
14 Jul
'03
1:26 p.m.
Am Sonntag, 13.07.03, um 02:43 Uhr (Europe/Berlin) schrieb Larry
Troxler:
Hi,
I hesitate to ask this here, since it's gotta be a basic shell thing,
and
certainly not audio specific, so if you want to flame me for me OT and
laziness, go ahead.
The problem is that when I run I run an X application from a console
(for
example, "pd &" or "rosegarden &", the console output from
all the
applications I run are interleaved onto the xterm that I started them
from.
That part is fine.
The part that is not fine, is that the output is not labeled with the
application that it came from.
For example, I seem to remember that if in the past, if you ran grep,
for
example, anything that grep sent to its console would be prefixed by
"grep:".
I thought that this was a convention that the apps followed, and not a
shell
thing (I seem to remember "printf("%s: ...", argv[0], ....")
Hopefully, I'm wrong about this, and there is a shell option that puts
the
application name in front of every line of output. Is there?
Unfortunately not. The programs just write to stdout/stderr and the
shell, being just another program
does not even get to see this output. So the only chance is, that the
programs do it themselves.
Otoh doing just printf("%s: ...", argv[0], ....") is probably no what
most users want.
Imagine the output being saved to a file or piped to another program.
So if a program wants to offer this service it should check, if its
writing to a tty
(unix speak for any kind of terminal) and most of the programmers did
not
make this effort for every printf (in pseudo C)
if(isatty(stdout))
myname=argv[0];
else
myname="";
printf("%s: ...", myname, ....")
If it's not something I can make happen in the
shell, then how is
everyone
dealing with this? Currently I am actually opening a seperate xterm
for each
X application that I run, which is quite cumbersome, because it means
that I
have to manage twice minus one as many windows as I would if I could
have all
the output into one xterm, identified with where it came from.
If you need the output, save it to a file. Dont forget stderr:
pd >& ~/pd.out &
(csh-like)
regards,
Thomas N.