passing the output of cmd from "eval" to a variable

Shell Programming and Scripting
1

Hello,

I need help with the eval command.

I have been building a lengthy cmd using eval, and I need to create $var from the output of the cmd. Here is what I have.

 
Out=/dfezz1/output.txt
Node="'LPAR Info:'"
Gr3p0=" |grep"
Printc=" prtconf"
Output1=" 1>>$Out 0>&1"
Cat1="cat /dfezz1/tmp.txt"
 
eval "$Cat1 $Gr3p0 $Node $Output1"
cmd = cat /defezz1/tmp.txt |grep LPAR Info: 1>>$Out 0>&1

I have tried ...
With and without double quotes "" and __

 
eval "VAR=$Cat1 $Gr3p0 $Node $Output1"

I am running several eval grep-ing for various info and what I want to do is format the outputs and comma separate or use pipes and import it into excel.

so sometime like this after I get the eval --> $VAR

cat $VAR1 || $VAR2 || $VAR3 || >> results.txt .... then pull it into a .xls

Thanks
-Dfezz1

2

If I understand correctly you don't need eval/variable and you don't need cat at all. Search your shell man pages for command substitution. You just need to format and spool the output (using printf, for example).

3

Thanks, but these commands I am buiding seem to require eval, due to whittespace and | symbols ect. the cat was only an example to show what I wanted to do with the formating, what I really need to know is how do take the output from my eval(command) and make it a variable like ---

 
eval(VAR1="$Cat1 $Gr3p0 $Serial $Output1")

but I can't get the syntex correct and I can't find a good example, I know it can be done and once I have that, the rest is cake!

once I get this, i will create a readable , maintainable spreadsheet, with all of my server info

example: hostname || IP || firmware || OS ver. || Memory || etc.

Then this can be ran and update

4

Try:

cmd="$Cat1 $Gr3p0 $Node $Output1"
eval VAR=\$\($cmd\)
5

Thanks that worked KINDA...
I am getting the value written to the output file, not assigned to the variable ???

So

 
cmd="$Cat1 $Gr3p0 $Node $Output1"
eval VAR=\$\($cmd\)

works, but when I echo or print $VAR it's empty. ????

But one step closer thanks:b:

6

Oh, right. But that's the result of redirecting the output. If you want the result of the command to be both written to a file and printed to the standard output, use 'tee' command.

7

I want the ouput written to a file and assigned to a variable so I can format it

8 
Out=/dfezz1/output.txt
Node="'LPAR Info:'"
Gr3p0=" |grep"
Printc=" prtconf"
Output1=" | tee -a $Out"
Cat1="cat /dfezz1/tmp.txt"

cmd="$Cat1 $Gr3p0 $Node $Output1"
eval VAR=\$\($cmd\)
9

I have re-written the script.

here is what I ended up going with and it works;

I ran a prtconf statement and wrote it out to /dfezz/tmp.txt then I cat and grep for what I need, the other way I was doing it was running that cmd several times.

   
NodeName=`eval "cat /dfezz/tmp.txt |grep 'LPAR Info:'"`
SerialNum=`eval "cat /dfezz/tmp.txt |grep 'Machine Serial Number:'"`
FWare=`eval "cat /dfezz/tmp.txt |grep 'Firmware Version:'"`
Model=`eval "cat /dfezz/tmp.txt |grep 'System Model:'"`
Proc=`eval "cat /dfezz/tmp.txt |grep 'Processor Type:'"`
ChipSpeed=`eval "cat /dfezz/tmp.txt |grep 'Processor Clock Speed:'"`
Memory=`eval "cat /dfezz/tmp.txt |grep 'Memory Size:'| grep -v 'Good Memory Size:'"`
OSver=`eval "cat /dfezz/tmp2.txt"`
echo $OSver
echo "$NodeName $Space $SerialNum $Space $FWare $Space $Model $Space $Proc $Space $ChipSpeed $Space $Memory $Space OS Level: $OSver" 1>>$Out 0>&1