File: pty2.awk

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gawk 1%3A5.1.0-1
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file content (9 lines) | stat: -rw-r--r-- 167 bytes parent folder | download | duplicates (4) 
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BEGIN {
   cmd = "tr '[A-Z]' '[a-z]' 2> /dev/null"
   PROCINFO[cmd, "pty"] = 1
   input = "ABCD"
   print input |& cmd
   cmd |& getline x
   print x
#   close(cmd)
}