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executing variables in ksh scripts?

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Top Forums Shell Programming and Scripting executing variables in ksh scripts?
# 1  
Old 08-06-2003
executing variables in ksh scripts?

In a ksh script on an AIX box running a jillion oracle database processes, I'm setting a variable to one of two possible arguments, depending on cmd line arguments.

FINDIT="ps -ef | grep oracle | grep DBexport | grep rshrc"
FINDIT="ps -ef | grep oracle | grep prod | grep runback"

I want to have a way to execute the command list defined by the variable $FINDIT later in the script, putting the result in another variable. Any ideas how?

Things I have tried:
1. The straightforward RESULT=`$FINDIT`
(I get a usage on ps)

2. Putting the list in braces gives me bad substitution

3. exec is not on the system.

With either of the possible values of $FINDIT, if I execute them on the command line, there is no problem. What am I doing wrong?

# 2  
Old 08-06-2003
Try something like this:

Remember to check for proper number of arguments and such. Probably also want to send stderr to /dev/null to avoid errors (if any)

find_them () {


ps -ef | grep oracle | grep $1 | grep $2 > /tmp/found_them.txt


Now execute this function when ever you need it, passing in your two search strings and use the resulting /tmp file as needed.

Last edited by google; 08-06-2003 at 06:25 AM..
# 3  
Old 08-06-2003
# 4  
Old 08-06-2003


That was a great idea. And if I weren't so short-sighted, I'd have tried that. Of course, since I'm lazy, I would have shortened it even more:

find_them () {
RESULT=`ps -ef | grep oracle | grep $1 | grep $2`


Thanks! Since I'm lazy and 'eval' is shorter than creating a function, I tried that first, and it worked on the command line. I'm betting it'll work in the script as well. Of course, this is monitoring a process that runs 1/week, so I'll confirm next Tuesday...

Anyway, Thanks to both of you. It's greatly appreciated.


Last edited by Perderabo; 08-24-2012 at 03:17 PM..
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