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Full Discussion: cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way
Operating Systems Linux Gentoo cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post 302221164 by broli on Sunday 3rd of August 2008 07:16:43 PM
Old 08-03-2008
Quote:
Originally Posted by era
The idiomatic way to code an endless loop is simply while true although you also see the obscure while : which avoids an external process (even though true is often a shell built-in in modern shells).
great, this sort of things is what i was expecting when i posted here Smilie
i didn't used true, because i had the idea that it doesn't work (i might have got that form an old aix/tru64 at work)
i will google for more info on ":"

Quote:
Originally Posted by era
Is there a reason to feed awk a line at a time? Why not just

Code:
tail -n +8 /tmp/salidatop | sort -r -n -k9 | head -n 5 |
awk ' { printf "[^fg(cyan)",$12,"(^fg(red)",$9,"^fg(green)]--" } '

well, the main reason is cause i didnt tough of it Smilie
specially because of the approach i had with the while
Quote:
Originally Posted by era
I don't see any spaces in the output, so tr -d ' ' seems superfluous.
well, i had spaces on my tests, dont know when they came from. i will check again
Quote:
Originally Posted by era
By using printf instead of print, there will be no trailing newline.
great !! i didnt knew this. this is really good
Quote:
Originally Posted by era
As an aside, you could have combined the two tr:s to one: tr -d ' \n'
didnt knew you could use tr like that

Quote:
Originally Posted by era
I don't understand the question about CPU percentage. You can add the user, system, and nice percentages, or just subtract the idle percentage from 100% as you note.
my main problem is how to get it, or where to get that info.

Quote:
Originally Posted by era
If you can replace the complex tail | head etc with a simple sed or awk script, that will probably help reduce the resource requirements. Perhaps you could pass some option to top to order the output like you want it, so you can avoid the separate sort -- that's probably the main bottleneck here (albeit a very minor one, with so little input).
i have the vague idea that i could use awk to avoid head | tail | cut , but i dont know how

could you give me some directions ?
specially to a good example
 

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