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50 lines
1.2 KiB
Bash
50 lines
1.2 KiB
Bash
#!/bin/sh
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#---------------------------------------------------------------------------#
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# Copyright (C) 1995 University of Melbourne.
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# This file may only be copied under the terms of the GNU General
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# Public License - see the file COPYING in the Mercury distribution.
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#---------------------------------------------------------------------------#
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#
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# MERCURY_UPDATE_INTERFACE
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#
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# usage:
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# mercury_update_interface [-v] filename
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#
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# Moves `filename.tmp' to `filename', but only if necessary:
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# if they are identical, then `filename.tmp' is simply removed,
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# and the time-stamp is left unaltered.
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#
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# If the `-v' (verbose) option is specified, then appropriate progress messages
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# will be printed.
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#
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# Enviroment variables: none.
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PATH=/bin:/usr/bin
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verbose=true
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if [ $# -ge 1 ] && [ "$1" = "-v" ]; then
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verbose=true
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shift
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fi
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if [ $# -ne 1 ]; then
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echo "Usage: `basename $0` filename" 1>&2
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exit 1
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fi
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filename="$1"
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if [ ! -f "$filename" ]
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then
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$verbose && echo "creating \`$filename'." 1>&2
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mv -f "$filename.tmp" "$filename"
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elif cmp -s "$filename.tmp" "$filename"
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then
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$verbose && echo "\`$filename' has not changed." 1>&2
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rm -f "$filename.tmp"
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else
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$verbose && echo "\`$filename' has changed." 1>&2
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mv -f "$filename.tmp" "$filename"
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fi
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