bash function to go 'up' a bunch of folders

up.sh

# usage example (after 'source'ing this file):
#  up 4
# to go up 4 folders
#
# or:
#  up
# then it goes up by 1, and you can press ENTER to go up further
# press any other key to stay where your are
#
# Bonus: Sets OLDPWD, so you can use "cd -" to go back to the origin path
#
# (Tested with bash 5, TODO: "up foobar" to go to the next folder that matches the pattern "foobar")
function up {
    local OLD=`pwd`
    if [ "$#" == "1" ]; then
        local cnt=$1
        while [ $cnt != 0 ]; do
            cd ..
            cnt=`expr $cnt - 1`
        done
        pwd
        export OLDPWD=$OLD
        return
    fi
    local char=''
    local cnt=0
    while [ "$char" == "" ]; do
        cd ..
        pwd
        cnt=`expr $cnt + 1`
        read -n1 -s -r char
    done
    export OLDPWD=$OLD
    echo "up by $cnt"
}