pwd: /out/package
ppid: 3949
   1: WRITELN mkdir test
   2: WRITELN cd test
   3: WRITELN echo 123 > 1.txt
   4: WRITELN cat 1.txt
   5: WRITELN ls -a
   6: WRITELN cd ..
   7: WRITELN ls -R
   8: WRITELN cat test/1.txt
   9: WRITELN exit
exit: 0

mumsh $ mumsh $ mumsh $ mumsh $ 123
mumsh $ .
..
1.txt
mumsh $ mumsh $ .:
driver
mumsh
mumsh_memory_check
test

./test:
1.txt
mumsh $ 123
mumsh $ exit

mumsh $ mumsh $ mumsh $ mumsh $ 123
mumsh $ .
..
1.txt
mumsh $ mumsh $ .:
driver
mumsh
mumsh_memory_check
test

./test:
1.txt
mumsh $ 123
mumsh $ exit