github.com/benhoyt/goawk@v1.8.1/testdata/gawk/rstest4.awk (about)

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    22  # Date: Mon, 5 May 2003 02:20:08 -0700
    23  # From: "John H. DuBois III" <spcecdt@armory.com>
    24  # To: Aharon Robbins <arnold@skeeve.com>
    25  # Subject: Re: gawk 3.1.2b now available
    26  # Message-ID: <20030505092008.GA15970@armory.com>
    27  # References: <200305041149.h44BnLcm005484@localhost.localdomain>
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    38  # 
    39  # This is a curious one:
    40  # 
    41  # gawk-3.1.2b 'BEGIN {
    42  #     while (("echo" | getline) == 1)
    43  # 	;
    44  #     RS = ""
    45  #     "echo \"a\n\nb\"" | getline y
    46  #     print x
    47  # }' | hd
    48  # 
    49  # The output is:
    50  # 
    51  # 0000    00 13 0a                                           ...
    52  # 0003
    53  # 
    54  # (the uninitialized variable 'x' is somehow getting the value <null><control-S>)
    55  # 
    56  # 	John
    57  # -- 
    58  # John DuBois  spcecdt@armory.com  KC6QKZ/AE  http://www.armory.com/~spcecdt/
    59  # 
    60  BEGIN {
    61      while (("echo" | getline) == 1)
    62  	;
    63      RS = ""
    64      "echo \"a\n\nb\"" | getline y
    65      printf "y = <%s>\n", y	# ADR
    66      printf "x = <%s>\n", x	# ADR
    67  }