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# If given two arguments to cd, replace the first with the second in $PWD,
# emulating a Zsh function that I often find useful; preserves options too
__cd() {
    local opts=
    while getopts elP opt; do
        opts="$opts -$opt"
    done
    shift "$(($OPTIND-1))"
    if [[ "$#" -eq 2 ]]; then
        if [[ "$PWD" == *"$1"* ]]; then
            builtin cd $opts "${PWD/$1/$2}"
        else
            printf 'bash: cd: could not replace substring\n'
            return 1
        fi
    else
        builtin cd $opts "$@"
    fi
}
alias cd='__cd'