A shell function for Bash that goes up a specified number of directory levels. Easier than typing `cd ../../../` etc.

up.sh

#! /bin/bash

function up () {
    levels=$1

    if [ -z "$levels" ]; then
        levels=1
    fi

    # Test if $levels is a number; the -eq operator expects a number, and will
    # output an error if one is not found. Any output the STDERR is redirected
    # to the bit bucket (/dev/null)
    if [ "$levels" -eq "$levels" ] 2> /dev/null; then
        if [ "$levels" -eq "0" ]; then
            levels=1
        fi

        for (( c=1; c<=levels; c++ ))
        do
            cd ../
        done
    else
        echo up: expected a number, not $levels
    fi
}