Record Case Detail

This function is in beta test. Please help improve it in the issues here.

 pwd: /out/package
ppid: 5362
   1: WRITELN > abc | | grep 123
   2: 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 $ =================================================================
==5363==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7ffe8f25f8bf at pc 0x00000051df5a bp 0x7ffe8f25a660 sp 0x7ffe8f25a658
READ of size 1 at 0x7ffe8f25f8bf thread T0
    #0 0x51df59  (/out/package/mumsh_memory_check+0x51df59)
    #1 0x515a5f  (/out/package/mumsh_memory_check+0x515a5f)
    #2 0x51533c  (/out/package/mumsh_memory_check+0x51533c)
    #3 0x7fd0463afb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x41cc69  (/out/package/mumsh_memory_check+0x41cc69)

Address 0x7ffe8f25f8bf is located in stack of thread T0 at offset 31 in frame
    #0 0x51503f  (/out/package/mumsh_memory_check+0x51503f)

  This frame has 1 object(s):
    [32, 1056) 'cmd' <== Memory access at offset 31 underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-underflow (/out/pac

mumsh $ error: missing program
mumsh $ exit

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JOJ Answer