edit bash scripts to receive env vars

cube_checking/solve_cube.sh

@@ -1,10 +1,9 @@
-#!/usr/bin/env sh
+#!/bin/sh
 # Receives the desired cube number as $1
-
 gcc 6hole-cube.c -o cube_gen
 ./cube_gen $1 vars.out > .tmp_cube_$1
 python3 cube_join.py -f 6-30.cnf -c .tmp_cube_$1 -o with_cube_$1.cnf
-cadical with_cube_$1.cnf proof_cube_$1.lrat --lrat
-cake_lpr with_cube_$1.cnf proof_cube_$1.lrat
+${CADICAL:-cadical} with_cube_$1.cnf proof_cube_$1.lrat --lrat
+${CAKELPR:-cake_lpr} with_cube_$1.cnf proof_cube_$1.lrat
 
 rm with_cube_$1.cnf proof_cube_$1.lrat .tmp_cube_$1

cube_checking/verify_tautology.sh

@@ -1,5 +1,7 @@
+#!/bin/sh 
+
 gcc 6hole-cube.c -o cube_gen
 ./cube_gen 0 vars.out > cubes.icnf
 python3 cube_join.py -f 6-30.cnf -c cubes.icnf --tautcheck -o taut_if_unsat.cnf
-cadical taut_if_unsat.cnf tautology_proof.lrat --lrat
-cake_lpr taut_if_unsat.cnf tautology_proof.lrat
+${CADICAL:-cadical} taut_if_unsat.cnf tautology_proof.lrat --lrat
+${CAKELPR:-cake_lpr} taut_if_unsat.cnf tautology_proof.lrat