From: Shaw, Matthew (Matt.Shaw@xwave.com)
Date: Thu Jan 29 2004 - 15:03:05 EST
Stuart:
The $0 variable in awk is only 'recomputed' when an operation is
performed on the data in question. So no matter what you set the OFS to,
$0 will not be recomputed until you actually do 'something' to the
fields. One way to force a recomputation is to insert a command that
performs an operation on the fields while not modifying them:
echo $PATH | awk -F: '{OFS="\n"; $1=$1; print $0;}'
This will force the $0 to be updated properly with the correct OFS. This
has always seemed a little backwards to me, so I decided to do some
checking with google. Despite it's clunkiness, this appears to be the
'supported method'.
You can recreate the same behaviour in a somewhat more straightforward
manner with sed however: (the use of 'straightforward' here is also
questionable :)
echo $PATH | sed 's/:/\
/g'
(That's an actual 'Enter' after 's/:/\' - you can't insert a newline
with a character, you have to actually escape (\) a 'real' newline)
Hope this helps.
Thanks
Matt Shaw
Technical Architect
xwave, An Aliant Company
Desk: 506-389-4641
Cell: 506-863-8949
matt.shaw@xwave.com
-----Original Message-----
From: hpux-admin-owner@DutchWorks.nl
[mailto:hpux-admin-owner@DutchWorks.nl] On Behalf Of
SAbramson@Wabtec.com
Sent: Thursday, January 29, 2004 3:11 PM
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] Awk and $PATH
Can someone tell me why:
if this works:
# echo $PATH | awk -F: '{print $1}'
/usr/sbin/
why does't this work:
# echo $PATH | awk -F: '{OFS="\n";print $0}'
/usr/sbin/:/usr/bin/:/usr/sbin:/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/usr
/contrib/bin:/opt/fc/bin:/opt/fcms/bin:/opt/nettladm/bin:/opt/upgrade/bi
n:/opt/pd/bin:/usr/bin/X11:/usr/contrib/bin/X11:/opt/resmon/bin:/opt/pre
d/bin:/opt/hparray/bin:/opt/perf/bin:/opt/ignite/bin:/opt/cxperf/bin:/op
t/langtools/bin:/opt/imake/bin://opt/perl/bin:/opt/aCC/bin:/opt/hpnp//bi
n:/opt/networker/bin:/opt/graphics/common/bin:/opt/samba-2.2.5/source/bi
n:/sbin:/home/root:/usr/emc/ECC/bin:/usr/symcli/bin:/usr/symmapps/vcm:/u
sr/local/bin:/home/saroot/bin:/opt/perf/bin:/usr/symcli/bin:/usr/symcli6
4/bin/
What I want to do, is separate each separate directory in $PATH on it's
own line.
Stuart
Stuart Abramson | WABTEC Corp. | Wilmerding, PA
Off: 412/825-1434 | Cell: 412/417-1567 | email:
sabramson@wabtec.com
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