jo@bear$ PATH=/home/jo/bin:/usr/local/bin:/usr/bin:/bin
jo@bear$ cat <<EOF >tellme.sh
> #!/bin/bash
> echo this is tellme.sh from /usr/local/bin
> EOF
jo@bear$ chmod +x tellme.sh
jo@bear$ sudo cp tellme.sh /usr/local/bin
jo@bear$ which tellme.sh
/usr/local/bin/tellme.sh
jo@bear$ tellme.sh
this is tellme.sh from /usr/local/bin
jo@bear$ cat <<EOF >tellme.sh
> #!/bin/bash
> echo this is tellme.sh from ~/bin
EOF
jo@bear$ cp tellme.sh bin
jo@bear$ which tellme.sh
/home/jo/bin/tellme.sh
jo@bear$ tellme.sh
this is tellme.sh from /usr/local/bin
jo@bear$ hash -d tellme.sh
jo@bear$ tellme.sh
this is tellme.sh from /home/jo/bin