Record Case Detail - VE482 FA2020 (Manuel) - JOJ

This function is in beta test. Please help improve it in the issues here.

 pwd: /out/package
ppid: 83252
   1: WRITELN echo 123 > 1.txt
   2: WRITELN echo 321 > 2.txt
   3: WRITELN echo abc < 1.txt < 2.txt
   4: WRITELN echo abc | grep abc < 1.txt
   5: WRITELN exit

Your answer may be identical to the JOJ answer in the first several lines.

However, you will still get Wrong Answer because the complete output may be longer and there might be errors in the future lines.

Please double check your code to solve this problem and try again.

mumsh $ mumsh $ mumsh $ abc
mumsh $ abc
mumsh $ exit

mumsh $ mumsh $ mumsh $ error: duplicated input redirection
mumsh $ error: duplicated input redirection
mumsh $ exit