The '-i' flag should work regardless of whether the standard input is
a terminal. The Open Group notes this historic behavior and correctly notes that it doesn't make much sense. Note also, that mv(1) has always respected its '-i' regardless of whether the standard input is a terminal. From Timo Buhrmester.
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@ -1,4 +1,4 @@
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/* $NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $ */
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/* $NetBSD: cp.c,v 1.59 2016/03/05 19:48:55 uwe Exp $ */
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/*
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* Copyright (c) 1988, 1993, 1994
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@ -43,7 +43,7 @@ __COPYRIGHT(
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#if 0
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static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95";
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#else
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__RCSID("$NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $");
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__RCSID("$NetBSD: cp.c,v 1.59 2016/03/05 19:48:55 uwe Exp $");
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#endif
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#endif /* not lint */
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@ -145,7 +145,7 @@ main(int argc, char *argv[])
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iflag = 0;
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break;
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case 'i':
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iflag = isatty(fileno(stdin));
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iflag = 1;
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fflag = 0;
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break;
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case 'l':
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