Record Case Detail

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 pwd: /out/package
ppid: 4276
   1: WRITELN echo 321 > 1.txt
   2: WRITELN echo 123 > 2.txt
   3: WRITELN cat 2.txt
   4: WRITELN cat 1.txt
   5: WRITELN ls
   6: 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 $ 123
mumsh $ 321
mumsh $ 1.txt
2.txt
driver
mumsh
mumsh_memory_check
mumsh $ 
=================================================================
==4277==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 448 byte(s) in 14 object(s) allocated from:
    #0 0x4dcbb0  (/out/package/mumsh_memory_check+0x4dcbb0)
    #1 0x5191a9  (/out/package/mumsh_memory_check+0x5191a9)
    #2 0x7f565e4e2b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 80 byte(s) in 3 object(s) allocated from:
    #0 0x4dcbb0  (/out/package/mumsh_memory_check+0x4dcbb0)
    #1 0x519142  (/out/package/mumsh_memory_check+0x519142)
    #2 0x7f565e4e2b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

SUMMARY: AddressSanitizer: 528 byte(s) leaked in 17 allocation(s).

mumsh $ mumsh $ mumsh $ 123
mumsh $ 321
mumsh $ 1.txt
2.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

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