[SOLVED] script to read and compare two consecutive lines in a file

grail · 01-20-2011, 05:02 AM

Well in answer to your question why the awk script failed, this is because of a simple typo:

Code:

awk '{current = $NF;getline; if($NF == current)print "match";else print "mismatch"}' file

However, it would not have worked anyway as your input shown in the last post has no white space and is delimited by a dash (-)
So based on that, the following would be the small change required:

Code:

awk -F"-" '{current = $NF;getline; if($NF == current)print "match";else print "mismatch"}' file

I would mention, and of course it is your prerogative, but it is unusual to write a (ba)sh script that then calls a ksh script, especially when you try to include
it within a function:

Code:

DBcounttry_finalfunction()
{

#!/bin/ksh

I am not even aware that this would work as my understanding is the interpreter needs to be the first line (I could be wrong).

Is there a reason for the mash up? On a quick scan there does not appear to be anything particularly ksh specific that required this?

Anyhoo, let me know how you get on.

cristalp · 08-28-2012, 04:36 AM

Suppose you had a large file including thousands of lines and you may have a few lines that are different with consecutive lines, you may want to simply print its line number with the code:

Code:

awk '{current = $NF; getline; if($NF != current) print NR}'

If you want to check the number of fields rather than the content, you can try the similar code:

Code:

awk '{current = NF; getline; if(NF != current) print NR}'

Hope this additional solution can help those who has questions that are relevant but not exactly same.