string test?

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# 1  
Old 03-28-2002
string test?

hey guys- what is the syntax for a string test to verify that a user has entered a 6 digit numeric?

Thanks for your help in advance!

# 2  
Old 03-28-2002
Please provide more details. What language? C, perl, awk, shell (which shell?), other?. Thanks
# 3  
Old 03-28-2002
I'm sorry...I would like to do this in K shell. I need to check to make sure that a user is entering a 6 digit number. I'm new to scripting and can't find what I'm looking for in my books...

# 4  
Old 03-28-2002
Ok, this is probably an inefficient way to do it, but it should work. Other suggestions welcome.

# force variable to be integer
typeset -i myvar

echo "Enter value: \c"
read myvar

if [[ $myvar -lt 100000 || $myvar -gt 999999 ]]
       echo "value invalid"

# 5  
Old 03-28-2002
Is there a simpler or better way to do this with awk?
# 6  
Old 03-29-2002

you can use the substr function of awk. For more details do a man awk and you will find it.

Hope this helps
# 7  
Old 03-29-2002
awk uses only the same pattern matching that can be used by other unix commands. You can use expr:

if expr "$myvar" : "[0-9]\{6,6\}$" ; then
   echo 'exactly six digits'
   echo 'not six digits'

and if you want 6 digits starting with non-zero, you could use:
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