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65 lines
1.4 KiB
Bash
65 lines
1.4 KiB
Bash
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# WARNING -- first line intentionally left blank for sh/csh/ksh
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# compatibility. Do not remove it! FNF, UniSoft Systems.
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#
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# Usage is:
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# install <from> <to>
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#
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# The file <to> is replaced with the file <from>, after first
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# moving <to> to a backup file. The backup file name is created
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# by prepending the filename (after removing any leading pathname
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# components) with "OLD".
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#
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# This script is currently not real robust in the face of signals
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# or permission problems. It also does not do (by intention) all
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# the things that the System V or BSD install scripts try to do
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#
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if [ $# -ne 2 ]
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then
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echo "usage: $0 <from> <to>"
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exit 1
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fi
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# Now extract the dirname and basename components. Unfortunately, BSD does
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# not have dirname, so we do it the hard way.
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fd=`expr $1'/' : '\(/\)[^/]*/$' \| $1'/' : '\(.*[^/]\)//*[^/][^/]*//*$' \| .`
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ff=`basename $1`
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td=`expr $2'/' : '\(/\)[^/]*/$' \| $2'/' : '\(.*[^/]\)//*[^/][^/]*//*$' \| .`
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tf=`basename $2`
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# Now test to make sure that they are not the same files.
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if [ $fd/$ff = $td/$tf ]
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then
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echo "install: input and output are same files"
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exit 2
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fi
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# Save a copy of the "to" file as a backup.
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if test -f $td/$tf
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then
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if test -f $td/OLD$tf
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then
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rm -f $td/OLD$tf
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fi
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mv $td/$tf $td/OLD$tf
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if [ $? != 0 ]
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then
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exit 3
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fi
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fi
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# Now do the copy and return appropriate status
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cp $fd/$ff $td/$tf
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if [ $? != 0 ]
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then
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exit 4
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else
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exit 0
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fi
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