Record Case Detail

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 pwd: /out/package
ppid: 3765
   1: WRITELN echo abc > 1.txt > 2.txt
   2: WRITELN echo abc > 1.txt >> 2.txt
   3: WRITELN echo abc > 1.txt | grep abc
   4: WRITELN exit
exit: 1

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

However, the main problem you meet now is Runtime Error. And the exit code of your program is 1, which should be 0.

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

mumsh $ error: duplicated output redirection
mumsh $ =================================================================
==3766==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c000000178 at pc 0x000000499c0c bp 0x7fff77628c50 sp 0x7fff77628400
READ of size 94 at 0x60c000000178 thread T0
    #0 0x499c0b  (/out/package/mumsh_memory_check+0x499c0b)
    #1 0x528df5  (/out/package/mumsh_memory_check+0x528df5)
    #2 0x526274  (/out/package/mumsh_memory_check+0x526274)
    #3 0x525e5c  (/out/package/mumsh_memory_check+0x525e5c)
    #4 0x523966  (/out/package/mumsh_memory_check+0x523966)
    #5 0x51685c  (/out/package/mumsh_memory_check+0x51685c)
    #6 0x7f79615e7b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #7 0x41d169  (/out/package/mumsh_memory_check+0x41d169)

0x60c000000178 is located 0 bytes to the right of 120-byte region [0x60c000000100,0x60c000000178)
allocated by thread T0 here:
    #0 0x4dd020  (/out/package/mumsh_memory_check+0x4dd020)
    #1 0x7f7961645b8b  (/lib/x86_64-linux-gnu/libc.

mumsh $ error: duplicated output redirection
mumsh $ error: duplicated output redirection
mumsh $ error: duplicated output redirection
mumsh $ exit

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JOJ Answer