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Shell Programming and Scripting

comparing lines from 2 files

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# 1  
Old 05-21-2007
Question comparing lines from 2 files
Hi Friends,
I have 2 files A and B . I want to compare the 3rd line of file A and B .
(I dont want to compare the 2 files, using diff or cmp). I just want to know whether 3rd line of A matches the 3 rd line of B. Can anybody share their knowledge on the same?

Thanks ,
Vijaya
# 2  
Old 05-21-2007
Code:
third_lne_A=`sed -n '3{p;q;}' fileA'
third_lne_B=`sed -n '3{p;q;}' fileB'
if [ "$third_lne_A" = "third_lne_B" ]; then
      echo "Same..."
fi

# 3  
Old 05-21-2007
Bug comparing lines from 2 files
Dear anbu23,
can you please mention that in this line
third_lne_A=`sed -n '3{p;q;}' $FILENAME1`

what does {p;q;} mean?
the code is working properly.but please let me know {p;q;}

Thankx
Regards,
Pankaj
# 4  
Old 05-21-2007
Quote:
Originally Posted by panknil
Dear anbu23,
can you please mention that in this line
third_lne_A=`sed -n '3{p;q;}' $FILENAME1`

what does {p;q;} mean?
the code is working properly.but please let me know {p;q;}

Thankx
Regards,
Pankaj
3 - line number
p - print command
q - quit command

3{p;q;} If the current line is third line in the file, then print that line and quit sed command. For example if your file has 50,000 lines and if you dont provide quit command, sed will process all the lines in the file. If you use quit command, it will save time.
# 5  
Old 05-21-2007
Power comparing lines from 2 files
Thanx anbu for your quick reply and a nice explanation.

i also want to know that how can i compare field by fileld of two files, like File A and File B?
as you have compared the lines i want to compare the each and every fields of each line of both the file...

Thanks
Regards,
Pankaj
# 6  
Old 05-21-2007
Quote:
Originally Posted by panknil
Thanx anbu for your quick reply and a nice explanation.

i also want to know that how can i compare field by fileld of two files, like File A and File B?
as you have compared the lines i want to compare the each and every fields of each line of both the file...

Thanks
Regards,
Pankaj
If you want to compare all the fields which means comparing whole line with other. If not can you give sample input and output required?
# 7  
Old 05-21-2007
Quote:
Originally Posted by vijaya2006
Hi Friends,
I have 2 files A and B . I want to compare the 3rd line of file A and B .
(I dont want to compare the 2 files, using diff or cmp). I just want to know whether 3rd line of A matches the 3 rd line of B. Can anybody share their knowledge on the same?

Thanks ,
Vijaya
Code:
awk 'FNR == 3 && NR == FNR { line = $0; nextfile } 
     FNR == 3 { 
                 if (line==$0){
		     print "Line equal"
		 }
		 else {
		     print "Line not equal"
		 }                 
		}' file1 file2
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