Can awk print to the standard error ?

[Jdamian]

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

[Leif Halvarsson_2]

awk {print} 1>&2

[Arturo Perez del Galleg]

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

[Armin Feller]

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

[Jdamian]

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.

[Leif Halvarsson_2 · Accepted solution]

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

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

[Arturo Perez del Galleg]

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...

[Jdamian]

Thanx Leif.

This is what I needed.

[harry d brown jr]

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

[Bob_Vance]

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