pwd: /out/package
ppid: 17456
   1: WRITELN "echo" "123" "|" | cat > 1.txt
   2: WRITELN cat 1.txt
   3: WRITELN ls
   4: WRITELN exit

mumsh $ mumsh $ 123 |
mumsh $ 1.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

mumsh $ mumsh $ 123 |
mumsh $ 1.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit