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#
# ksh-like `cd': cd [-LP] [dir [change]]
#
cd()
{
OPTIND=1
while getopts "LP" opt
do
case $opt in
L|P) CDOPTS="$CDOPTS -$opt" ;;
*) echo "$FUNCNAME: usage: $FUNCNAME [-LP] [dir] [change]" >&2
return 2;;
esac
done
shift $(( $OPTIND - 1 ))
case $# in
0) builtin cd $CDOPTS "$HOME" ;;
1) builtin cd $CDOPTS "$@" ;;
2) old="$1" new="$2"
case "$PWD" in
*$old*) ;;
*) echo "${0##*/}: $FUNCNAME: bad substitution" >&2 ; return 1 ;;
esac
dir=${PWD//$old/$new}
builtin cd $CDOPTS "$dir" && echo "$PWD"
;;
*) echo "${0##*/}: $FUNCNAME: usage: $FUNCNAME [-LP] [dir] [change]" >&2
return 2 ;;
esac
}