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This entirely depends on the perspective the program is looking from. Not only free top, people found discrepancies among the outputs of sar -r, vmstat, ps aux.

But, as far as my knowledge goes,...

if [ `sed "s/.*\(ernie-1328697839.1233158\).*/\1/" mysql.log | wc -l` -ge 5 ]; then echo yes; fi

Suppose you have the log ina file called "file", here's the code you want to execute:
awk -F "'" '{ print $2 }' file | awk -F "-%" '{ print $1 }'

^ and * have special meanings in perl regular expressions, too.

Escape them!

^ and * still have special meanings to grep. Escape them.

A single double-quote would suffice in tr.
|tr -d '"'

^M should be put like: Press Ctrl and V, still holding Ctrl, press M

did you do this way?

Guru.

looks like there are some control characters. Redirect the output after the awk command to a file, and show us the output using cat -ve option.

I mean:

find /test/ -name "x*.cfg"|while read i;...

sed 's/"//g' file

Guru.

Yup, that too is good. You may shorten it as egrep -Hr If you remove $ at the end, it would also match 10.1.1.300, as the first pattern in round parenthesis [1-9] would match 3 and so would show that...

use
nohup scriptname &

Remove the quotes:

ERROR*memory

The output that passes through the pipe is buffered, I suppose you just need to wait until the buffer gets flushed ...
(just add some more lines and you should see the script working).

The supplied command sar it probably what you are after. If you are after the value since last boot, just fire it off without parameters. Depending on your installation, you may get hourly or 5...

Did this deliver what you need, or can I help some more?

"-h" is "human readable" on Linux systems (which nowadays usually means "display in Gigabytes").

On AIX systems you could use "-k" instead to get the values displayed in units of kilobytes or...