This guide explains eight practical uses of the ‘!’ operator in Linux shells, covering how to rerun commands by number, reference previous arguments, handle multiple parameters, search by keyword, repeat the last command, and perform conditional deletions and directory checks.
This guide explains the PHP function readline_write_history, showing how it writes command-line history to a file, detailing the required filename parameter and the boolean return values indicating success or failure, enabling developers to persist interactive shell sessions programmatically.
The PHP function readline_read_history() reads command history from a specified file, returning TRUE on success and FALSE on failure, and is used to load previously entered commands into the readline interface.
The article explains the PHP function readline_list_history(), which returns the complete command‑line history as an indexed array, describes its return value, and provides a practical example showing how to print the history using print_r.
This article explains how to use the Linux history command to view past commands, search with Ctrl +r, repeat previous entries, adjust the number of stored records, and clear the history, providing practical examples and configuration tips for effective shell management.
