pwd: /out/package
ppid: 4359
   1: WRITELN echo hello friends > a.txt
   2: WRITELN mv a.txt b.txt
   3: WRITELN cat b.txt
   4: WRITELN rm b.txt
   5: WRITELN exit

mumsh $ mumsh $ mumsh $ hello friends
mumsh $ mumsh $ exit

mumsh $ mumsh $ mumsh $ hello friends
mumsh $ mumsh $ exit