topic awk and shell problem in Operating System - HP-UX

awk and shell problem

pareshan — Sat, 22 Aug 2009 00:36:01 GMT

Could anyone help me with this plz......I haven't done much of awk and came across this which i couldnt solve

What does this do?

o awk -F':' '/^[Tt]he c.?[tw] jumps over the moon/{ print $1 }' ~/tmp/foo

In PERL what does this mean?

o $a->{‘foo’}

In ksh what does this do?

o myhost$ >/tmp/foo

Thanks in advance
i will really appreciate the help

Re: awk and shell problem

VK2COT — Sat, 22 Aug 2009 00:45:50 GMT

Hello,

Firstly, your current ITRC status is
not flattering:

"I have assigned points to 63 of 132
responses to my questions."

If you want to show appreciation when others
take time to reply to your questions, at a
minimum you should assign points.

Secondly, these are classical school
assignment questions. If you ever
had a chance to log into any Unix and/or
Linux servers, why did not you try to run
these commands and see what they do.
Believe me, the answers are very
simple and even logical. Plus,
on-line manuals for awk, Shell and perl
would help immediately too.

ITRC forums should not be abused as each
of us have other serious jobs to do.

Cheers,

VK2COT

Re: awk and shell problem

Laurent Menase — Mon, 24 Aug 2009 09:37:21 GMT

1 $ awk -F':' '/^[Tt]he c.?[tw] jumps over the moon/{ print $1 }' ~/tmp/foo

for every line in $HOME/tmp/foo like
The c..t jumps over the moon :1234
it prints what is before ":"
-F : is for field separator definition
/^pattern/{action}
execute action for each line starting with the pattern
print $1 since we have -F : will display what is before :

In ksh what does this do?

o myhost$ >/tmp/foo

myhost$ is your prompt apparantly
so it trucate /tmp/foo

open /tmp/foo with create, truncate flag, and since there is nothing to execute on the line close it
so just a truncate

Re: awk and shell problem

pareshan — Mon, 24 Aug 2009 12:29:41 GMT

Thanks alot

Re: awk and shell problem

pareshan — Mon, 24 Aug 2009 12:47:29 GMT

thanks