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Find text that is different in two files

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Top Forums Shell Programming and Scripting Find text that is different in two files
# 8  
Old 05-27-2015
Actually you don't need to store the long $0 in memory,
map[$1]=1 is enough.
Most awk can store even nothing, and can lookup elements without defining them if not found
Code:
awk 'FNR==NR{map[$1];next} ($18 in map)' import.txt all.txt

This User Gave Thanks to MadeInGermany For This Post:
mjf
# 9  
Old 05-27-2015
MadeInGermany,
Thanks for the tip, however, based on the requirement, the check to see if the variable exists in the array needs to be negated:
Code:
 
nawk 'FNR==NR{map[$1];next} !($18 in map)' import.txt all.txt

This User Gave Thanks to mjf For This Post:
MadeInGermany
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