awk to output cmd result - HP-UX

IMTheNachoMan · #1 (**permalink**) 04-27-2008

I was wondering if it was possible to tell awk to print the output of a command in the print.

Code:

 .... | awk '{print $0}'

I would like it to print the date right before $0, so something like (this doesn't work though)

Code:

 .... | awk '{print date $0}'

era · #2 (**permalink**) 04-27-2008

Code:

... | awk '{ "date" | getline date; print date " " $0 }'

Querying the date again and again for each line is pretty wasteful, though. Perhaps you want to do it in a BEGIN block, or something like

Code:

... | awk -v date="`date`" '{ print date " " $0 }'

Really old classical awk might not have all the required facilities; try nawk or mawk or gawk if your plain awk won't do. On HP-UX in particular, you may find that the xpg4 awk is more modern than the plain /usr/bin/awk. Searching this forum suggests that setting the environment variable UNIX95=1 might get you that.

You have very clueful questions, keep it up! (-:

IMTheNachoMan · #3 (**permalink**) 04-27-2008

That last one you posted works, but its static. The output of date never changes. Is there a way to make it dynamically call date every time it prints?

Thanks

era · #4 (**permalink**) 04-27-2008

Avoiding that was kind of the point. Try to find an awk which is new enough to do the first.

fpmurphy · #5 (**permalink**) 04-27-2008

Here is one way of doing what you want:

Code:

{
   "date +%T" | getline cur_date; print cur_date, $0
}

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