Record Case Detail

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 pwd: /out/package
ppid: 4524
   1: WRITELN echo 123 > 1.txt
   2: WRITELN echo abc > > > >
   3: WRITELN echo abc > < 1.txt
   4: WRITELN echo abc > | grep abc
   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 $ [Parse Error] File Redirect FILENAME NOT GIVEN!

=================================================================
==4527==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 1024 byte(s) in 1 object(s) allocated from:
    #0 0x4dd350  (/out/package/mumsh_memory_check+0x4dd350)
    #1 0x515d16  (/out/package/mumsh_memory_check+0x515d16)
    #2 0x7fc4242d3b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 80 byte(s) in 1 object(s) allocated from:
    #0 0x4dd350  (/out/package/mumsh_memory_check+0x4dd350)
    #1 0x518d79  (/out/package/mumsh_memory_check+0x518d79)
    #2 0x519ec8  (/out/package/mumsh_memory_check+0x519ec8)
    #3 0x51635e  (/out/package/mumsh_memory_check+0x51635e)
    #4 0x7fc4242d3b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 80 byte(s) in 1 object(s) allocated from:
    #0 0x4dd350  (/out/package/mumsh_memory_check+0x4dd350)
    #1 0x517141  (/out/package/mumsh_memory_check+0x517141)
    #2 0x515e17  (/out/package/mumsh_memory_check+0x515e17)

mumsh $ mumsh $ syntax error near unexpected token `>'
mumsh $ syntax error near unexpected token `<'
mumsh $ syntax error near unexpected token `|'
mumsh $ exit

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JOJ Answer