Miscellaneous

• $#var gives (length of array-1) (equivalently: the last index of array since it starts at 0)
• for buffer flushing, set $|=1, rather than usual 0.
• Some inline syntax for running Perl directly from the UNIX prompt without a .pl script file:
  • >cat grbase | perl -lane 'next if( 1..1 ); print $F[21];' | sort | uniq -c
  • >cat grbase | perl -lane 'next if( 1..1 ); print $F[21] if( $F[20] ne "M" );' | sort | uniq -c