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$ ./826946.pl
CMD        : >>echddo 'arghh'<<
RETURN_CODE: >>32512<<
CMD_RESULT : >>sh: echddo: not found
<<

$ ./826946.pl
sh: Syntax error: Unterminated quoted string
CMD        : >>echddo arghh'<<
RETURN_CODE: >>512<<
CMD_RESULT : >><<

( cmd:  echddo 'arghh' 2>&1 )
...
...
[pid 15945] write(2, "Syntax error: Unterminated quote"..., 40Syntax e
+rror: Unterminated quoted string) = 40
[pid 15945] write(2, "\n", 1
...