extracting a line based on line number

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# 1  
extracting a line based on line number

i want to cut all the entries from the /etc/passwd file in which the uid is> 500

for this i was writing this ,m quiet new to all this.. scripting

but on the 6th n 8th line ,, i hav to specify a line number .. to get the commnd working .. but i want to use variable i instead of that ,, which is not allowed ..

my problem is that ,, i have a variable i , which is being incremented n it is containing an integer value as u can c , now i want to print that line which is satisfying the if condition .

because i was not working so i wrote 56 instead of that , as in my passwd file it was havin pid >500 just to test ..

nol=`wc -l /etc/passwd | cut -d " " -f 1`
if [ $nol -ge $i ]
if [ `sed -n '56p' /etc/passwd | cut -d \: -f 3` -ge 500 ]
sed -n '56p' /etc/passwd >hii
i=`expr $i + 1`
# 2  
awk -F: '$3>500{print NR" " $0}' /etc/passwd

# 3  

thanks ,, yeah its workin ,, ,, i m gng to read bout awk now
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