Given a file like the following:-
01/09/2005
02/09/2005
03/09/2006
03/09/2006
I wish to compare if the last two lines are the same, and return a 1 if so or a 0 if they are not.
I can get the last two using a cat tail -2
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4 Answers
6
tail -n 2 filename.txt | uniq | wc -l
This will yield 1 for identical lines, 2 for different.
phs
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1My solution is the same! Except that I added a check for files with < 2 lines. – jman Nov 05 '11 at 00:12
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My solution is the same! Except that I added a `exit` statement to return the codes as requested in the "question". – Daniel Böhmer Nov 05 '11 at 11:01
2
How about this:
lc=`wc -l filename.txt | cut -d " " -f1`
if [ $lc -ge 2 ]
then
ulc=`tail -n 2 filename.txt | uniq | wc -l`
if [ $ulc -eq 1 ]
then
echo "Last two lines are identical"
fi
fi
jman
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2
Try this
[ `cat | tail -n 2 | uniq | wc -l` -eq "1" ] && echo 1 || echo 0
Replace echo by exit to make it the exit value. Used echo just for quicker testing.
#!/bin/bash
[ `cat | tail -n 2 | uniq | wc -l` -eq "1" ] && exit 1
exit 0
Daniel Böhmer
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1
This might work for you:
sed -n '$!h;${G;/\(.*\)\n\1$/{s/.*/1/p;q};s/.*/0/p}' filename.txt
potong
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