Environment & Shell Customization (Aliases/Functions/.Bashrc)

Stop your shell history from leaking secrets and getting overwritten

🧩 The Challenge

Dealing with a dozen open terminal tabs usually means your shell history ends up as a garbled mess of half-written commands from three different sessions. Plus, pasting a password into the CLI by mistake is a fast track to having it saved in plain text in your .bash_history for anyone with read access to find.

💡 The Fix

Tweak your shell options to force immediate writes and ignore lines that start with a space or look like duplicate junk. It cleans up your history and adds a layer of security by letting you exclude sensitive entries just by hitting space before the command.

export HISTCONTROL=ignorespace:erasedups
export HISTSIZE=10000
shopt -s histappend
PROMPT_COMMAND="history -a; history -n; $PROMPT_COMMAND"

⚙️ Why It Works

By appending to the file after every command instead of overwriting at logout, you stop the last tab to close from nuking your previous work. The ignorespace flag is a life-saver for one-off commands containing API keys or tokens.

🚀 Pro-Tip: Put a space before your command and it won’t show up in your history file—do this for every database login.

Linux Tips & Tricks | © ngelinux.com | 8/6/2026