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Why does the gawk-function close return -1 ?

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# 1  
Old 04-15-2016
Why does the gawk-function close return -1 ?
Hallo,

why does the gawk-function close return -1 ? Smilie
the file sortiert.txt was created and exists (with the sorted print-string).

The source Code:
Code:
BEGIN{
	print	"b\n\na\nx\n9" | "sort  > sortiert.txt"
	error = close ("sort > sortiert.txt")
	print error
	if (error) {print "close error"} else {print "close ok"}
}

in this example close returns 0 (as expected):

Code:
BEGIN{
print "I am the content" > "foo.txt"
error=	close ("foo.txt")
if (error) {print "close error"} else {print "close ok"}
			}


example 3: close returns 0 (as expected):

Code:
BEGIN{
    "date" | getline
    if (!NF) {exit -1;}
    print "Date: ", $0
    error=close("date")
if (error) {print "close error"} else {print "close ok"}
}

# 2  
Old 04-15-2016
You need to close the writing side of the pipe, not the reading side. From the gawk manual:

======
For example, if you open a pipe with this: "sort -r names" | getline foo
then you must close it with this:
close("sort -r names")
========
Last edited by RudiC; 04-15-2016 at 05:15 AM.. Reason: Added icode tags.
# 3  
Old 04-15-2016
hallo,

My example1 is from this nawk-site:

www . staff.science.uu.nl/~oostr102/docs/nawk/nawk_39.html

Trim the spaces in the url (i am not allowed to post links)

Quote:
if you open a pipe with this:

print $1 | "sort -r > names.sorted"
then you must close it with this:

close("sort -r > names.sorted")
print pipes the data to the shell-command.
# 4  
Old 04-15-2016
Quote:
Originally Posted by wilmaed
Hallo,

why does the gawk-function close return -1 ? Smilie
the file sortiert.txt was created and exists (with the sorted print-string).

The source Code:
Code:
BEGIN{
	print	"b\n\na\nx\n9" | "sort  > sortiert.txt"
	error = close ("sort > sortiert.txt")
	print error
	if (error) {print "close error"} else {print "close ok"}
}

in this example close returns 0 (as expected):

Code:
BEGIN{
print "I am the content" > "foo.txt"
error=	close ("foo.txt")
if (error) {print "close error"} else {print "close ok"}
			}


example 3: close returns 0 (as expected):

Code:
BEGIN{
    "date" | getline
    if (!NF) {exit -1;}
    print "Date: ", $0
    error=close("date")
if (error) {print "close error"} else {print "close ok"}
}

What output do you get from the following command sequence?:
Code:
date
printf "b\n\na\nx\n9\n" | sort > sortiert.txt
printf 'exit code is %d\n' $?
ls -l sortiert.txt
id

# 5  
Old 04-15-2016
Hi,

my cygwin (GNU Awk 4.1.3) output:


Code:
wilma@windows10 /
$ unlink sortiert.txt

$ date
Fr, 15. Apr 2016 09:12:41

wilma@windows10 /
$ printf "b\n\na\nx\n9\n" | sort > sortiert.txt

wilma@windows10 /
$ printf 'exit code is %d\n' $?
exit code is 0

wilma@windows10 /
$ ls -l sortiert.txt
-rw----r--+ 1 wilma Kein 9 15. Apr 09:12 sortiert.txt

wilma@windows10 /
$ id
uid=197609(wilma) gid=197121(Kein) Gruppen=197121(Kein),545(Benutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte Benutzer),15(Diese Organisation),113(Lokales Konto),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere Verbindlichkeitsstufe)

wilma@windows10 /
$ more sortiert.txt

9
a
b
x

# 6  
Old 04-15-2016
Quote:
Originally Posted by wilmaed
Hallo,

why does the gawk-function close return -1 ? Smilie
the file sortiert.txt was created and exists (with the sorted print-string).

The source Code:
Code:
BEGIN{
    print    "b\n\na\nx\n9" | "sort  > sortiert.txt"
    error = close ("sort > sortiert.txt")
    print error
    if (error) {print "close error"} else {print "close ok"}
}

.
.
.
"sort > sortiert.txt" is not open. The target for your print has two spaces in front of the redirection.
Last edited by RudiC; 04-15-2016 at 04:39 AM.. Reason: Rephrased.
# 7  
Old 04-15-2016
Oh ... Smilie

thank you
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