docker/config.sh|13 col 11| Use grep -q instead of comparing output with [ -n .. ].
start_gdb.sh|18 col 6| Check exit code directly with e.g. 'if mycmd;', not indirectly with $?.
recompile.sh|65 col 30| To redirect stdout+stderr, 2>&1 must be last (or use '{ cmd > file; } 2>&1' to clarify).