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How do I compare the last two lines of a file?

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Top Forums Shell Programming and Scripting How do I compare the last two lines of a file?
# 1  
Old 08-25-2008
Error How do I compare the last two lines of a file?
Hi, I want to compare the last two lines of a files, specifically characters 32 - 50 in both lines and generate an exit code if the range of characters do not match. Please advise. Thanks in advance!
# 2  
Old 08-25-2008
Tools a start to this
tail -2 inputfile | head -1
generates the 2nd to last line
tail -1 inputfile
generates the last line

so, in scripting
Code:
line2=$(tail -2 inputfile | head -1)
line1=$(tail -1 inputfile)

you can use cut to pull out sections of either/both, and then an if statement to compare and do your next steps.
# 3  
Old 08-25-2008
Computer
hi joey,
thanks! i ended up using sed which accomplishes the same thing. For some reason, i was thinking it had to be a one liner
Code:
 # print the last 2 lines of a file (emulates "tail -2")
 sed '$!N;$!D' $myfile > twolines.txt
 
 # Cut credit amount
 credit=`sed q twolines.txt| cut -c32-49`
 debit=`sed '$!d' twolines.txt | cut -c32-49`

then i compared with an if on the credit/debit.
go boston
Last edited by limshady411; 08-25-2008 at 02:43 PM.. Reason: complete sentence
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