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awk -F . '{printf"%s\n",$NF}' filename

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awk -F . '{printf"%s\n",$NF}' filename

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awk -F . '{printf"%s\n",$NF}' filename

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cat filename | sed "s/.*\.//"

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while read X;do echo ${X/*./};done < filename

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awk -F\. '{print $NF}' file

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Perl code:
awk '{ sub(/[0-9]+( |$)/,"") ; print } test.txt

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awk '{ sub(/[0-9]+( |$)/,"") ; print }' test.txt


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Perl codeawk'{ sub(/[0-9]+( |$)/,"") ; print } test.t