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How to compare the columns in two .csv files?

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Top Forums Shell Programming and Scripting How to compare the columns in two .csv files?
# 8  
Old 06-08-2011
Example :

Code:
$ cat f1
hostname MAC SWITCH_IP SWITCH_PORT
01HW1234 000 172.20.1.0 Fastethernet0
01HW4567 111 172.20.1.1 Fastethernet1
01HW1234 000 172.20.1.0 Fastethernet2

Code:
$ cat f2
hostname MAC SWITCH_IP SWITCH_PORT
01HW1234 000 172.20.1.1 Fastethernet1
01HW8901 111 172.20.1.1 Fastethernet1
01HW1234 000 172.20.1.0 Fastethernet2

Code:
$ nawk 'NR==FNR{a[$1]=$0;next}($1 in a) {print}' f1 f2
hostname MAC SWITCH_IP SWITCH_PORT
01HW1234 000 172.20.1.1 Fastethernet1
01HW1234 000 172.20.1.0 Fastethernet2

---> also display unchanged lines
Code:
$ nawk 'NR==1{print}NR==FNR{a[$1]=$0;next}($1 in a)&&$0!=a[$1]' f1 f2
hostname MAC SWITCH_IP SWITCH_PORT
01HW1234 000 172.20.1.1 Fastethernet1

--->does not display unchanged lines (except the header line of course)

---------- Post updated at 03:53 PM ---------- Previous update was at 03:37 PM ----------

Quote:
Originally Posted by vgersh99
Code:
nawk 'FNR==NR {f1_3[$1]=$3;f1_4[$1]=$4;next} FNR==1{print;next}$1 in f1_3 && ($3!=f1_[$3] || $4!=f1_4[$1])' file1 file2

or more simply
Code:
nawk 'NR==FNR{a[$1]=$3$4;next}($1 in a)&&($3$4!=a[$1])||FNR==1' file1 file2

Last edited by ctsgnb; 06-08-2011 at 10:43 AM..
These 2 Users Gave Thanks to ctsgnb For This Post:
Kanchana vgersh99
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