login_tweaks.md

.zhsrc or .bashrc Additions

---

==All of the additions in this file can be added by running== add_all_login_tweaks.sh.

---

Shortcut Reminders

I have added a lot of shortcuts to my .bashrc and .zshrc over the years. And then promptly forgot about most of them. To try and fix that, I add some reminder text for when I open a shell or connect via SSH. An example of the reminder is below. It adds a brief reminder of the shortcuts I have added so I see them each time I log in.

To add the reminder, add the following to your .bashrc or .zshrc. Add others to the list as you create more shortcuts.

cat << EOF
Shortcuts:
🐍 pyvenv

EOF

---

Quickly make python3 virtual environments

Add the following to your .bashrc or .zshrc.

mkvenv() {
    if [[ ! -n "$1" ]]; then
        dir=$(mktemp -d /tmp/python3-XXXX)
    else
        dir="$1"
    fi

    if [[ ! -d "$dir" ]]; then
        cd $HOME
        mkdir -p "$dir"
    fi

    cd "$dir" || return
    python3 -m venv venv
    if [ $? -ne 0 ]; then
        echo "Failed to create virtual environment."
        return
    fi
}

runvenv() {
    mkvenv "$@"
    source venv/bin/activate
}

alias pyvenv="mkvenv "$1"; runvenv"

Usage

pyenv
# or
pyenv <foldername>

Command	What it does
pyvenv	Creates a temporary folder, switches to it and activates a python3 virtual environemt. Does not launch python3; stays at a prompt so you can pip install.
pyvenv <somedir>	Creates a folder named <somedir> in $HOME activate a python3 virtul environment. Does not launch python3; stays at a prompt so you can pip install.

---