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Need to find the gap in the sequence of numbers

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# 1  
Old 03-07-2011
Need to find the gap in the sequence of numbers
Hi Guys,

I have a file with numbers in sequence.
The sequence have been broken somewhere.. I need to find out at which number the sequence has been broken...

For an example, consider this sequence, it needs to give me output as 4 (as 5 is missing) and 6(as 7 is missing)
Quote:
1
2
3
4
6
8
9
Thanks for your help in advance..

Cheers!!!!
# 2  
Old 03-07-2011
What should be the output if the gap is more then 1 number, like:

Code:
1
2
3
4
6
8
9
12
16

# 3  
Old 03-07-2011
One way through scripting..I wouldn't claim it to be faster unless the sequence of number is less.
Code:
#!/usr/bin/ksh
n=1
while [[ $n -le 30 ]] # Considering max of 30 sequence numbers present in file
do
        grep -wq $n sdf
        [[ $? -ne 0 ]] && echo "Missing: $i"
        ((n+=1))
done

---------- Post updated at 06:06 PM ---------- Previous update was at 05:46 PM ----------

Sorry.Misunderstood the requirement. Ignore the above script..
# 4  
Old 03-07-2011
Quote:
Originally Posted by mac4rfree
For an example, consider this sequence, it needs to give me output as 4 (as 5 is missing) and 6(as 7 is missing)
Base on your sample data
Code:
awk 'NR-1{if($1!=(_+1))print _}{_=$1}' file

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