make random-fractal

% cat Makefile

BASH=/bin/bash
ECHO=/bin/echo
SLEEP=/bin/sleep
BC=/usr/bin/bc
PRINTF=/usr/bin/printf

random-fractal: shell
        while ${SLEEP} 0.1 ; \
        do \
          if [ `${ECHO} $$RANDOM % 2 | ${BC}` -eq 0 ] ; \
          then \
            ${PRINTF} " " ; \
          else \
            ${PRINTF} "█" ; \
          fi ; \
        done ;
shell:
        $(eval SHELL := ${BASH})

% make

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