Record Case Detail

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 pwd: /out/package
ppid: 3328
   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 $ error: duplicated output redirection
mumsh $ error: duplicated output redirection
mumsh $ 
=================================================================
==3329==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 640 byte(s) in 20 object(s) allocated from:
    #0 0x4dcbb0  (/out/package/mumsh_memory_check+0x4dcbb0)
    #1 0x5191a9  (/out/package/mumsh_memory_check+0x5191a9)
    #2 0x7fac2a872b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 56 byte(s) in 1 object(s) allocated from:
    #0 0x4dcbb0  (/out/package/mumsh_memory_check+0x4dcbb0)
    #1 0x519142  (/out/package/mumsh_memory_check+0x519142)
    #2 0x7fac2a872b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

SUMMARY: AddressSanitizer: 696 byte(s) leaked in 21 allocation(s).

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

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JOJ Answer