LinuxQuestions.org - [SOLVED] How to programatically feed top with key strokes

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How to programatically feed top with key strokes

Hi fellow forumers,

I'm writing a simple bash script and I would like it to be able to to execute top (that's the easy part) and then to supply the parameters to top
programatically.

Here is the explanation:
Top is an interactive program that requires user input to do stuff, sort etc. I would like to programatically do so, for example:

top;
supply input;
get info;
quit;

Is it possible with simple bash?

Regards

Hi,

You are aware that top (tries to) read /etc/toprc and ~/.toprc?

If the parameters you want to give to top are always the same you could consider creating a ~/.toprc (start top, set all the options and press W).

I'm not 100% sure, but I don't think you can feed top any options once it is up and running.

Hope this helps.

Quote:

Originally Posted by druuna (Post 4082335)

Actually, if you can't, it will be a kinda useless utility. That's why I believe it can be feeded. As there is probably a misunderstanding about what I want, here is the code:

Code:

#!/bin/bash

NRCORES=`mpstat  | grep CPU | head -n1 | awk '{print $6}' | tr -d "(" | bc`

PIDOFJAVA=`pidof java`

echo $PIDOFJAVA

echo $NRCORES

echo "Now trying to do the shit..."

exec 6<&0

exec < input

`top -p $PIDOFJAVA`

read a1

echo $a1

exec 0<&6 6<&-

the input file is in the same directory and contains only
1[newline feed]

If you reproduce the thingy in normal terminal:

Code:

top -p $PIDOFJAVA

waits for user input, and if you press one (1), it shows the cpu/memory utilization on the java process on different cores.
I want to be able to do that programatically, so user input is not required

Will

Code:

top -b ...

help you ?

Quote:

Originally Posted by Valery Reznic (Post 4083192)

Will

Code:

top -b ...

help you ?

Will my reply:
O M G?!
answer your question.