How to detect the current directory in which I run my shell script?

Question

How may I detect the name of the directory (or better yet the entire path) in which my shell script is run?

Answer 1

alternative method

pid=$$
path=$(ps -eo pid,args| awk -vp=$pid '$1~p{print $3}')
case "$path" in
    ./* ) pwd;;
    * ) echo $path;;
esac