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Generate unique user id with each addition of data

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# 1  
Old 11-29-2011
Generate unique user id with each addition of data
As I add new data to database.txt I want to generate a unqiue User Id. This is my current solution.

Code:
echo $RANDOM:$lname:$fname >> database.txt

But I seem to have problems when I try and use $RANDOM for formatting like so:

Code:
grep "^4539" database.txt | awk -F":" '{print "User ID:\t"$RANDOM"\nLast Name:\t" $lname"\nFirst Name:\t"$fname}'

How can I generate a unique user id another way. Where the variable can be used for piping and formatting?
# 2  
Old 11-29-2011
* How long can this unique user id be?
* In one of my scripts, I had used the following to generate a unique string. See if this helps:
Code:
USER_ID="user`date +%Y%m%d%H%M%S`"

Of course, if you were to use the variable USER_ID more than once within a second, then this would fail.
# 3  
Old 11-29-2011
Sounds good. Calling that variable would simply require a $USER_ID correct?
# 4  
Old 11-29-2011
Try
Code:
grep "^4539" database.txt | awk -F":" -vRAND=$RANDOM '{print "User ID:\t"RAND"\nLast Name:\t" $lname"\nFirst Name:\t"$fname}'

# 5  
Old 11-29-2011
If you want to use any variables inside awk, you will need to pass them...
Try this to get the usage...
Code:
awk -v arg=$RANDOM 'BEGIN{print arg}'

Also, use of grep is not required when you can achieve the same with awk!
Code:
awk '/^4539/{...}' input_file

HTH
--ahamed
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