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| <h4 class="subsection">31.2.5 Searching for Commands in the History</h4> |
| |
| <p>Readline provides commands for searching through the command history |
| for lines containing a specified string. |
| There are two search modes: <dfn>incremental</dfn> and <dfn>non-incremental</dfn>. |
| |
| <p>Incremental searches begin before the user has finished typing the |
| search string. |
| As each character of the search string is typed, Readline displays |
| the next entry from the history matching the string typed so far. |
| An incremental search requires only as many characters as needed to |
| find the desired history entry. |
| To search backward in the history for a particular string, type |
| <kbd>C-r</kbd>. Typing <kbd>C-s</kbd> searches forward through the history. |
| The characters present in the value of the <code>isearch-terminators</code> variable |
| are used to terminate an incremental search. |
| If that variable has not been assigned a value, the <ESC> and |
| <kbd>C-J</kbd> characters will terminate an incremental search. |
| <kbd>C-g</kbd> will abort an incremental search and restore the original line. |
| When the search is terminated, the history entry containing the |
| search string becomes the current line. |
| |
| <p>To find other matching entries in the history list, type <kbd>C-r</kbd> or |
| <kbd>C-s</kbd> as appropriate. |
| This will search backward or forward in the history for the next |
| entry matching the search string typed so far. |
| Any other key sequence bound to a Readline command will terminate |
| the search and execute that command. |
| For instance, a <RET> will terminate the search and accept |
| the line, thereby executing the command from the history list. |
| A movement command will terminate the search, make the last line found |
| the current line, and begin editing. |
| |
| <p>Readline remembers the last incremental search string. If two |
| <kbd>C-r</kbd>s are typed without any intervening characters defining a new |
| search string, any remembered search string is used. |
| |
| <p>Non-incremental searches read the entire search string before starting |
| to search for matching history lines. The search string may be |
| typed by the user or be part of the contents of the current line. |
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