pwd: /out/package
ppid: 14416
   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

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

=================================================================
==14417==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 16384 byte(s) in 1 object(s) allocated from:
    #0 0x4dce50  (/out/package/mumsh_memory_check+0x4dce50)
    #1 0x516050  (/out/package/mumsh_memory_check+0x516050)
    #2 0x51bb4d  (/out/package/mumsh_memory_check+0x51bb4d)
    #3 0x522b26  (/out/package/mumsh_memory_check+0x522b26)
    #4 0x7f0474871b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 16384 byte(s) in 1 object(s) allocated from:
    #0 0x4dce50  (/out/package/mumsh_memory_check+0x4dce50)
    #1 0x516050  (/out/package/mumsh_memory_check+0x516050)
    #2 0x51a2d3  (/out/package/mumsh_memory_check+0x51a2d3)
    #3 0x522b26  (/out/package/mumsh_memory_check+0x522b26)
    #4 0x7f0474871b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 8192 byte(s) in 1 object(s) allocated

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