newshell

#!/bin/bash

# Check whether there are child zsh processes to pull cwd from
# Sets $BEST_PID to the PID of the deepest zsh process
# 
# Usage: checkchildren <PID>
function checkchildren() {
    if [[ $# -eq 1 ]]; then
        psdata=(`ps ho pid,comm --ppid=$1`)
        if [[ ${#psdata[@]} -ge 2 ]]; then
            if [[ "${psdata[1]}" == "zsh" ]]; then
                BEST_PID=${psdata[0]}
            fi
            checkchildren ${psdata[0]}
        fi
    fi
}

if [[ $# -ne 1 ]]; then
    echo "Usage: $0 <PID>"
    exit
fi

ps $1 > /dev/null
if [[ $? -ne 0 ]]; then
    echo "Process not found"
    exit
fi

BEST_PID=$1
checkchildren $1

dir=`pwdx $BEST_PID | sed 's/.*: //'`
cd "$dir"
urxvt &