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I've never heard of a gwak command??? If you mean awk or gawk (or on Solaris/SunOS systems nawk or /usr/xpg4/bin/awk), try:
echo 123456_BLA_BLA | awk '{print substr($0, 1, 6)}'
but, this could be...

You want to find lines with -nnn at the end of the line?


grep '-[0-9]+$' somefile


Or do you want only those exact patterns?

grep -e '-55$' -e '-44$' -e '-6$' somefile

awk -F"-" '{print $NF}' file

grep matches lines.

how about awk?

awk -F- '{ print $NF }' filename