[mariolima]

Hi:

Imagine I need to issue, in a Bash Script, a command like "uptime". The result of this command is a line with many words and numbers, like:

10:40:18 up 48 days, 11:54, 1 user, load average: 0.12, 0.15, 0.16

I am particularly interested in getting those 3 different Load Average Times.

Question: how to code it in the script so that I can issue the uptime command, pass it on via pipe to another command putting each of these times in a different variable?

Thanks a lot.

Mario./

[Squashman]

Originally Posted by mariolima

Hi:

Imagine I need to issue, in a Bash Script, a command like "uptime". The result of this command is a line with many words and numbers, like:

10:40:18 up 48 days, 11:54, 1 user, load average: 0.12, 0.15, 0.16

I am particularly interested in getting those 3 different Load Average Times.

Question: how to code it in the script so that I can issue the uptime command, pass it on via pipe to another command putting each of these times in a different variable?

Thanks a lot.

Mario./

Hmm, this could be difficult. I was thinking of using the cut command but that would not work because the output lenght is probably going to change. I will look a little more into this. CodeJockey will probably have an answer for this.

[Squashman]

Oh, I forgot you can use a delimeter in the cut command. But you are still going to have to tweak that output as well.

uptime | cut -f4 -d ","

[Squashman]

uptime | cut -f4 -d "," | tr -d " load average: "
uptime | cut -f5 -d "," | tr -d " "
uptime | cut -f6 -d "," | tr -d " "

[liviu]

Try to read Advanced Bash-Scripting Guide
http://www.tldp.org/LDP/abs/html/

[codejockey]

CodeJockey will probably have an answer for this.

Well, I might if I'd ever get off my digital derriere ... ( ) ...

Actually, LwdSquashman has got things pretty well covered -- but of course, there are other variations. As earlier posts mentioned the punctuation in the output from uptime is a problem (also true of the w and top commands, which also report this information). You might use something like this:

OUTPUT="`uptime | tr -d ','`"
set $OUTPUT
ARGCOUNT=`expr $# - 3`
shift $ARGCOUNT

echo one minute loadavg is $1
echo five minute loadavg is $2
echo fifteen minute loadavg is $3

which assumes that the data of interest will always be the last 3 fields in the output from the uptime command.

Hope this helps.

[xico]

What should I be reading to understand the code you're talking in?

[Whiteskin]

http://pegasus.rutgers.edu/~elflord/unix/bash-tute.html then http://www.tldp.org/LDP/abs/html/