Hard wrap hard refill

Given this file: $ cat file alfa bravo charlie delta echo foxtrot golf hotel india juliet kilo lima mike november oscar papa quebec romeo sierra tango uniform_victor_whiskey_xray yankee zulu I would like to hard break at 70, but I would also like to hard refill. I tried "fold", but it did not refill: $ fold -w 70 file alfa bravo charlie delta echo foxtrot golf hotel india juliet kilo lim a mike november oscar papa quebec romeo sierra tango uniform_victor_whiskey_xray yankee zulu "fmt" will refill, but I could only get it to break on spaces so no guarantee to wrap on exactly 70: $ fmt file alfa bravo charlie delta echo foxtrot golf hotel india juliet kilo lima mike november oscar papa quebec romeo sierra tango uniform_victor_whiskey_xray yankee zulu I tried "pr" but it seems to just truncate the line without wrapping: $ pr -t -W 70 file alfa bravo charlie delta echo foxtrot golf hotel india juliet kilo lim november oscar papa quebec romeo sierra tango uniform_victor_whiskey_xray yankee zulu Maybe these commands have some option I am missing, or maybe Awk or Sed solution. I would prefer to avoid heavier solutions (Perl PHP Ruby).