Record Case Detail

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 pwd: /out/package
ppid: 4556
   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 $ =================================================================
==4557==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x619000000980 at pc 0x0000004aa6fa bp 0x7ffe9f4bbcb0 sp 0x7ffe9f4bb460
READ of size 1002 at 0x619000000980 thread T0
    #0 0x4aa6f9  (/out/package/mumsh_memory_check+0x4aa6f9)
    #1 0x5165e9  (/out/package/mumsh_memory_check+0x5165e9)
    #2 0x5153f2  (/out/package/mumsh_memory_check+0x5153f2)
    #3 0x7f995e258b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x41cce9  (/out/package/mumsh_memory_check+0x41cce9)

0x619000000980 is located 0 bytes to the right of 1024-byte region [0x619000000580,0x619000000980)
allocated by thread T0 here:
    #0 0x4dcba0  (/out/package/mumsh_memory_check+0x4dcba0)
    #1 0x518e48  (/out/package/mumsh_memory_check+0x518e48)
    #2 0x51538a  (/out/package/mumsh_memory_check+0x51538a)
    #3 0x7f995e258b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

SUMMARY: AddressSanitizer: heap-buffer-overflow (/out/package/mumsh_memory_check+0x4aa6

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

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JOJ Answer