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Operating Systems Solaris No output from awk command
# 1  
Old 02-16-2015
Code No output from awk command
Hi all,

In my SunOS 5.10, the command awk using BEGIN option doesn't print output variables like expected
here is my test:

with the following code everything is alright
ps -eo pcpu,args | grep "httpd" | awk ' { print $1 } '
the result is
0.1

However, with this command
ps -eo pcpu,args | grep "httpd" | awk 'BEGIN {cpu=$1} END { print cpu }'
the result is
BLANK SPACE
# 2  
Old 02-16-2015
Hello Elmassimo,

On a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk , /usr/xpg6/bin/awk , or nawk, this should work then.

EDIT: Also why not use print in spite of using BEGIN and END.
Code:
ps -eo pcpu,args | grep "httpd" | /usr/xpg6/bin/awk '{print "cpu =" $1}'
OR
ps -eo pcpu,args | grep "httpd" | /usr/xpg4/bin/awk '{print "cpu =" $1}'


Thanks,
R. Singh
Last edited by RavinderSingh13; 02-16-2015 at 06:00 AM.. Reason: Added a comment about awk
This User Gave Thanks to RavinderSingh13 For This Post:
Elmassimo
# 3  
Old 02-16-2015
Hi,
In awk, Begin body is execute before file reading, so no fields is setting at this moment.

Regards.
This User Gave Thanks to disedorgue For This Post:
Elmassimo
# 4  
Old 02-16-2015
Yes I do agree with disedorgue here. From man awk as follows.
Quote:
BEGIN and END are two special kinds of patterns which are not tested against the input. The action parts of all BEGIN patterns are merged as if all the statements had been written in a single BEGIN block. They are executed before any of the input is read.
Thanks,
R. Singh
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