topic Re: printf formatting help in Operating System - Linux

printf formatting help

lawrenzo_1 — Thu, 29 May 2008 06:46:27 GMT

Hello all,

I need some help with printf ....

I have a file that looks like:

SAL:FPGW:Running
SAL:runmqlsr:Running
SKM:FPGW:Running
SKM:runmqlsr:Running

I want to print the fields accross the screen to a certain format:

FPGW Running Running
runmqlsr Running Running

so I write an awk statement:

awk -F":" '/^SAL/ {(SAL = $3);/^SKM/ (SKM = $3); printf "%-15s\t%10s\n", $2,SAL"\t"SKM}'

and the output looks like:

FPGW Running Running
runmqlsr Running Running

however I want it to look like this and cant work it out - please help :-)

FPGW Running Running
runmqlsr Running Running

thanks

Chris.

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 06:52:32 GMT

hmmmm its not printed to the web as I expected so I will use "\t" to denote the tabs:

FPGW"\t\t"Running"\t\t\t\t\t\t"Running
runmqlsr"\t\t"Running"\t\t\t\t\t\t"Running

thanks

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 07:23:47 GMT

I have a solution but pretty sure this can be done better with proper printf formatting:

awk -F":" '/^SAL/ {(SAL = $3);/^SKM/ (SKM = $3); printf " %-15s\t%0s\n", $2,SAL"\t\t\t\t\t\t"SKM}' FILE.

Re: printf formatting help

Dennis Handly — Thu, 29 May 2008 09:34:25 GMT

I'm not sure what you are trying to do. Nor even why awk doesn't complaint about your syntax. You seem to have:
awk -F":" '
/^SAL/ {
(SAL = $3) # why () here?
/^SKM/ (SKM = $3) # HUH??
printf "%-15s\t%10s\n", $2,SAL"\t"SKM
} '

I have no idea what "^SKM/ (SKM = $3)" does. It seems to always do the assignment.

If you want two tabs between the first %s and the next, you need to replace that %-15s\t%10s by just %s\t\t%s.

Also, why bother with SAL"\t"SKM, when you can do that in the printf format? (printf may be slower than concatenation though.)

Re: printf formatting help

James R. Ferguson — Thu, 29 May 2008 11:01:15 GMT

Hi Chris:

Another way -- a hash (associative array) to hold the data and print it afterwards:

# perl -ne 'chomp;@a=split /:/;push(@{$line{$a[1]}},$a[2]);END{for $x (sort keys %line) {printf "%-10s %s\n",$x,"@{$line{$x}"}}}' file

...yields:

FPGW Running Running
runmqlsr Running Running

Regards!

...JRF...

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 11:45:27 GMT

Thanks both,

Dennis I am still getting to grips with awk so I am not sure of any other way.

I try putting parenthesis around section of the awk but do not get the required output.

what do you suggest?

Re: printf formatting help

Dennis Handly — Thu, 29 May 2008 11:49:20 GMT

You haven't specified what you want, just the column format. Start with this:
SAL:FPGWL:Running1
SAL:runmqlsrL:Running2
SKM:FPGWM:Running3
SKM:runmqlsrM:Running4

What do you want for the output?

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 11:49:41 GMT

I think I got it:

awk -F":" '
/^SAL/ {
SAL = $3
/^SKM/
SKM = $3
print $2,SKM,SAL}' FILE

(without the printf off course .....

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 11:52:29 GMT

FPGW Running Running
runmqlsr Running Running

with tabs formatting to the screen - which I now have from the printf.

This is being added to a script where SAL and SKM are 2 sites and the next field are the services running or not ....

thanks all the same

Chris.

Re: printf formatting help

Dennis Handly — Thu, 29 May 2008 12:00:36 GMT

>I think I got it:
awk -F":" '
/^SAL/ {
SAL = $3
/^SKM/
SKM = $3
print $2,SKM,SAL}' FILE

I don't see how.
The first RE makes sure it starts with SAL. The second RE is nested within the first condition so it can't be true at the same time.

If you are always ordered SAL then SKM, perhaps you meant:
/^SAL/ {SAL = $3; next}
/^SKM/ {
SKM = $3
print $2,SKM,SAL}' FILE

Re: printf formatting help

lawrenzo_1 — Thu, 29 May 2008 12:15:03 GMT

ok thanks Dennis,

I can see that now ....

I havent come across the "next" statement until now so much appreciated.

Chris.

Re: printf formatting help

Dennis Handly — Thu, 29 May 2008 12:19:24 GMT

>I haven't come across the "next" statement

next wasn't really needed but it does simply the logic some. Just like return is better than deeply nested if blocks or flag programming. And of course better than gotos. :-)