Record Case Detail

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 pwd: /out/package
ppid: 21873
   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

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.

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mumsh $ mumsh $ mumsh $ 
=================================================================
==21877==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 3072 byte(s) in 3 object(s) allocated from:
    #0 0x4dcf90  (/out/package/mumsh_memory_check+0x4dcf90)
    #1 0x517f6b  (/out/package/mumsh_memory_check+0x517f6b)
    #2 0x515941  (/out/package/mumsh_memory_check+0x515941)
    #3 0x7fcd763ccb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 3072 byte(s) in 3 object(s) allocated from:
    #0 0x4dcf90  (/out/package/mumsh_memory_check+0x4dcf90)
    #1 0x517ff3  (/out/package/mumsh_memory_check+0x517ff3)
    #2 0x515941  (/out/package/mumsh_memory_check+0x515941)
    #3 0x7fcd763ccb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 32 byte(s) in 2 object(s) allocated from:
    #0 0x4dcf90  (/out/package/mumsh_memory_check+0x4dcf90)
    #1 0x5157a7  (/out/package/mumsh_memory_check+0x5157a7)
    #2 0x7fcd763ccb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 2048 byte

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

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JOJ Answer