Record Case Detail

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 pwd: /out/package
ppid: 90941
   1: WRITELN echo 123 > 1.txt
   2: WRITELN "echo" "<1.'txt'" < 1.txt > "2.""txt"
   3: WRITELN cat 1.txt
   4: WRITELN cat 2.txt
   5: WRITELN ls
   6: 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 $ main.c:258:16: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:137:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior main.c:258:16 in 
AddressSanitizer:DEADLYSIGNAL
=================================================================
==90944==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000004b226b bp 0x7ffd7a4d9410 sp 0x7ffd7a4d8b80 T0)
==90944==The signal is caused by a READ memory access.
==90944==Hint: address points to the zero page.
    #0 0x4b226a  (/out/package/mumsh_memory_check+0x4b226a)
    #1 0x517a83  (/out/package/mumsh_memory_check+0x517a83)
    #2 0x51601b  (/out/package/mumsh_memory_check+0x51601b)
    #3 0x7f103e80ab96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x41cd99  (/out/package/mumsh_memory_check+0x41cd99)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/out/package/mumsh_memory_check+0x4b226a) 
==

mumsh $ mumsh $ mumsh $ 123
mumsh $ <1.'txt'
mumsh $ 1.txt
2.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

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JOJ Answer