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

Stop manually cleaning up your shell history

🧩 The Challenge

Dealing with a massive bash history file that keeps logging duplicates or commands I’ve already cleaned up is a nightmare. I’ve wasted way too much time scrolling through fifty entries of the same ls -la just to find that one specific curl command from last week.

💡 The Fix

Set a few specific shell variables in your rc file to force bash to ignore duplicates and save your session history in real-time. It cleans up the mess automatically without you ever having to think about it.

HISTCONTROL=ignoreboth:erasedups
HISTSIZE=10000
HISTFILESIZE=20000
shopt -s histappend
PROMPT_COMMAND="history -a; $PROMPT_COMMAND"

⚙️ Why It Works

Adding that PROMPT_COMMAND ensures every command is flushed to the file immediately after you run it, so you don’t lose history if your terminal crashes. Setting the control variables tells the shell to wipe out consecutive repeats and leading-space commands before they even get written to disk.

🚀 Pro-Tip: Stick a space before your sensitive commands and they won’t even hit the history file.

Linux Tips & Tricks | © ngelinux.com | 10/20/2026