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checking valid values in variable

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# 1  
Old 10-23-2006
checking valid values in variable
I'm using the following in my script.

if echo $cpuidle |/usr/bin/egrep [0-9][0-9]; then

when I issue this statement it issues the value of the variable back to stdout which ends up in my output file.
Is there a better way to write this?

I'm using ksh on solaris 9.
# 2  
Old 10-23-2006
I don't know if I understand what you want, but couldn't you use the -q (quiet) option to suppress writing to stdout?
# 3  
Old 10-23-2006
Code:
if echo $cpuidle | grep -q  [0-9][0-9]; then

If you don't have -q option then use this

Code:
echo $cpuidle | grep [0-9][0-9] > /dev/null
if [ $? = 0 ]; then

# 4  
Old 10-23-2006
I had to use /usr/xpg4/bin/grep to get the -q option.
thanks, that works!
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