Record Case Detail

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 pwd: /out/package
ppid: 3721
   1: WRITELN echo 123 > 1.txt
   2: WRITELN echo 321 > 2.txt
   3: WRITELN echo abc < 1.txt < 2.txt
   4: WRITELN echo abc | grep abc < 1.txt
   5: 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 $ mumsh $ mumsh $ error: duplicated input redirection
mumsh $ error: duplicated input redirection
mumsh $ exit

=================================================================
==3722==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 1600 byte(s) in 2 object(s) allocated from:
    #0 0x4dce00  (/out/package/mumsh_memory_check+0x4dce00)
    #1 0x515ab5  (/out/package/mumsh_memory_check+0x515ab5)
    #2 0x7f4ac0e0eb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 80 byte(s) in 1 object(s) allocated from:
    #0 0x4dce00  (/out/package/mumsh_memory_check+0x4dce00)
    #1 0x515a5a  (/out/package/mumsh_memory_check+0x515a5a)
    #2 0x7f4ac0e0eb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 80 byte(s) in 1 object(s) allocated from:
    #0 0x4dce00  (/out/package/mumsh_memory_check+0x4dce00)
    #1 0x51f195  (/out/package/mumsh_memory_check+0x51f195)
    #2 0x515ae6  (/out/package/mumsh_memory_check+0x515ae6)
    #3 0x7f4ac0e0eb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21

mumsh $ mumsh $ mumsh $ error: duplicated input redirection
mumsh $ error: duplicated input redirection
mumsh $ exit

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JOJ Answer