topic Re: Can awk print to the standard error ? in Operating System - HP-UX

Can awk print to the standard error ?

Jdamian — Tue, 14 Jan 2003 08:46:11 GMT

How can awk print to the standard error instead of standard output ?

Re: Can awk print to the standard error ?

Leif Halvarsson_2 — Tue, 14 Jan 2003 08:58:01 GMT

awk {print} 1>&2

Re: Can awk print to the standard error ?

Arturo Perez del Galleg — Tue, 14 Jan 2003 08:58:02 GMT

Are you tried:
awk '...' file 2>file2 1>&2
The standard error to a file and the redirection of the standard output to the same file.
But... what is the sense?
awk '...' file 1>file2 2>&1
obtains the same output.
HTH

Re: Can awk print to the standard error ?

Armin Feller — Tue, 14 Jan 2003 09:01:18 GMT

Hi,

you can use file descriptor 0 for standard input, 1 for standard output, and 2 for standard error:

# awk {print} 1>&2

Regards ...
Armin

Re: Can awk print to the standard error ?

Jdamian — Tue, 14 Jan 2003 09:05:41 GMT

Arturo, please, I don't want to collect the "awk" error messages... I want my awk program prints in standard error. For example:

awk ' { if (n==0) print "ERROR" }'

I want ERROR be printed in standard error, not in standard output.

Leif, your suggestion will print on standard error ANY message... I don't want that. I want the error messages be printed in standard error but I also want normal output be printed in standard output.

Re: Can awk print to the standard error ?

Leif Halvarsson_2 — Tue, 14 Jan 2003 09:33:24 GMT

Hi,
Perhaps not very elegant but berhaps you can try it.

awk '{print | "cat 1>&2" }

Re: Can awk print to the standard error ?

Arturo Perez del Galleg — Tue, 14 Jan 2003 09:46:31 GMT

Oops!
I'm surprised, this is your answer? In your first post you're saying this?
My recomendation is:
awk '...' file >file2
grep 'ERROR' file2 >file_error
The selection of the standard output that you want isn't possible.
By the way, is very curious that the all replies beeing similars the points not...

Re: Can awk print to the standard error ?

Jdamian — Tue, 14 Jan 2003 11:40:50 GMT

Thanx Leif.

This is what I needed.

Re: Can awk print to the standard error ?

harry d brown jr — Tue, 14 Jan 2003 12:59:35 GMT

J. Damian Benavent,

You can now go through your profile and find your previous posts and assign points (166 of 227): http://forums.itrc.hp.com/cm/TopSolutions/1,,BR158676!1!questions,00.html

live free or die
harry

Re: Can awk print to the standard error ?

Bob_Vance — Wed, 15 Jan 2003 18:08:47 GMT

FWIW,
'gawk' (gnu awk -- the 'awk' on Linux) supports the following syntax:

awk '{print "error" >> "/dev/stderr" } '

(note the special file name
"/dev/stderr"
)
as in:

# echo | awk '{print "hello"} ; print "error" > "/dev/stderr" } '

hello
error

# echo | awk '{print "hello"} ; print "error" > "/dev/stderr" } ' >/dev/null

error

bv