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Search a file for patterns from another file to another with awk

 
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# 8  
Old 12-11-2012
Quote:
Originally Posted by Fundix
I was wondering about
Code:
NR==FNR

and have found that it's a trick to be sure we are reading file1.
To be sure you are reading file2 don't you need to use
Code:
NR!=FNR

?

How can we manage it in case of we need to read more than 2 files ?

Thank You
Good Doubt.. Smilie

See

NR - Number of line read. It is total number of lines read.

FNR - Number of line for current file. Total number of lines read for a current file.

So after finishing first file we don't really need to have condition as NR!=FNR

check..

Code:
$ cat file1
1|AAA|123456
2|BBB|098765432

$ cat file2
-|klk|AAA|$123.00|Qty.2|US
-|opi|EEE|$23.00|Qty.4|US

$ awk 'NR==FNR{print "NR",NR,"FNR",FNR;next}{print "NR",NR,"FNR",FNR}' file1 file2
NR 1 FNR 1
NR 2 FNR 2
NR 3 FNR 1
NR 4 FNR 2

# check this also..

$ awk 'NR==FNR{print "NR",NR,"FNR",FNR,FILENAME;next}{print "NR",NR,"FNR",FNR,FILENAME}' file1 file2
NR 1 FNR 1 file1
NR 2 FNR 2 file1
NR 3 FNR 1 file2
NR 4 FNR 2 file2

Quote:
Originally Posted by Fundix
How can we manage it in case of we need to read more than 2 files ?
To perform awk operation for more than two files please check this..Smilie

https://www.unix.com/shell-programmin...#post302716845
Last edited by pamu; 12-11-2012 at 05:58 AM.. Reason: added info...
This User Gave Thanks to pamu For This Post:
Fundix
# 9  
Old 12-11-2012
Things are clearer now Smilie

For more than 2 files, your thread remind me that i've read something about it.

A great THANK YOU Smilie
# 10  
Old 12-12-2012
This is rather simple

Code:
awk 'BEGIN{FS=OFS="|"} NR==FNR {a[$3]=$0; next} ($2 in a) {print $1, $2, a[$2]}' file2 file1

# 11  
Old 12-12-2012
Quote:
Originally Posted by royalibrahim
This is rather simple
I don't think there is any other difference than just reading file2 first and then file1..Smilie

so what makes its simple..?Smilie
 
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