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try


awk -F: 'FNR==NR{a[$1]=$2;next}$2 in a{print $0 FS a[$2]}'

He used the files in reverse order. You mean, match case insensitive, but print case from file2...?


gawk -F":" "NR==FNR{a[tolower($1)]++;next}tolower($1) in a" 11.txt 22.txt


edit: i believe...