Terminal Efficiency: Ubuntu Command Line History Management

Managing Ubuntu command line history effectively can significantly improve operational efficiency. The core methods are as follows: **Viewing and Searching**: Use the basic `history` command to display numbered historical commands. For quick searching, use `Ctrl+R` for reverse search (keyword matching, press Enter to execute, Ctrl+G to exit), or `history | grep "keyword"` for filtering. **Modifying and Deleting**: Use `fc` to modify commands, e.g., `fc -e number` to open an editor for correction, or `fc -s number parameter` to modify parameters and execute. To delete, use `history -c` to clear the session, `history -d number` to delete a specific command, or directly `rm ~/.bash_history` to permanently clear. **Customization and Optimization**: Edit `~/.bashrc` to set `HISTSIZE`/`HISTFILESIZE` to control the number of commands, `HISTCONTROL=ignoredups` to ignore duplicates, `HISTTIMEFORMAT` to add timestamps, and `HISTIGNORE` to shield sensitive commands. **Practical Tips**: Use `Ctrl+P/N` to navigate through history, and `!number` to execute historical commands. Proper management of history can greatly enhance command reuse efficiency.