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| <h3 class="section">1.2 Controlling <samp><span class="command">ar</span></samp> with a Script</h3> |
| |
| <pre class="smallexample"> ar -M [ <<var>script</var> ] |
| </pre> |
| <p><a name="index-MRI-compatibility_002c-_0040command_007bar_007d-30"></a><a name="index-scripts_002c-_0040command_007bar_007d-31"></a>If you use the single command-line option ‘<samp><span class="samp">-M</span></samp>’ with <samp><span class="command">ar</span></samp>, you |
| can control its operation with a rudimentary command language. This |
| form of <samp><span class="command">ar</span></samp> operates interactively if standard input is coming |
| directly from a terminal. During interactive use, <samp><span class="command">ar</span></samp> prompts for |
| input (the prompt is ‘<samp><span class="samp">AR ></span></samp>’), and continues executing even after |
| errors. If you redirect standard input to a script file, no prompts are |
| issued, and <samp><span class="command">ar</span></samp> abandons execution (with a nonzero exit code) |
| on any error. |
| |
| <p>The <samp><span class="command">ar</span></samp> command language is <em>not</em> designed to be equivalent |
| to the command-line options; in fact, it provides somewhat less control |
| over archives. The only purpose of the command language is to ease the |
| transition to <span class="sc">gnu</span> <samp><span class="command">ar</span></samp> for developers who already have scripts |
| written for the MRI “librarian” program. |
| |
| <p>The syntax for the <samp><span class="command">ar</span></samp> command language is straightforward: |
| <ul> |
| <li>commands are recognized in upper or lower case; for example, <code>LIST</code> |
| is the same as <code>list</code>. In the following descriptions, commands are |
| shown in upper case for clarity. |
| |
| <li>a single command may appear on each line; it is the first word on the |
| line. |
| |
| <li>empty lines are allowed, and have no effect. |
| |
| <li>comments are allowed; text after either of the characters ‘<samp><span class="samp">*</span></samp>’ |
| or ‘<samp><span class="samp">;</span></samp>’ is ignored. |
| |
| <li>Whenever you use a list of names as part of the argument to an <samp><span class="command">ar</span></samp> |
| command, you can separate the individual names with either commas or |
| blanks. Commas are shown in the explanations below, for clarity. |
| |
| <li>‘<samp><span class="samp">+</span></samp>’ is used as a line continuation character; if ‘<samp><span class="samp">+</span></samp>’ appears |
| at the end of a line, the text on the following line is considered part |
| of the current command. |
| </ul> |
| |
| <p>Here are the commands you can use in <samp><span class="command">ar</span></samp> scripts, or when using |
| <samp><span class="command">ar</span></samp> interactively. Three of them have special significance: |
| |
| <p><code>OPEN</code> or <code>CREATE</code> specify a <dfn>current archive</dfn>, which is |
| a temporary file required for most of the other commands. |
| |
| <p><code>SAVE</code> commits the changes so far specified by the script. Prior |
| to <code>SAVE</code>, commands affect only the temporary copy of the current |
| archive. |
| |
| <dl> |
| <dt><code>ADDLIB </code><var>archive</var><dt><code>ADDLIB </code><var>archive</var><code> (</code><var>module</var><code>, </code><var>module</var><code>, ... </code><var>module</var><code>)</code><dd>Add all the contents of <var>archive</var> (or, if specified, each named |
| <var>module</var> from <var>archive</var>) to the current archive. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>ADDMOD </code><var>member</var><code>, </code><var>member</var><code>, ... </code><var>member</var><dd><!-- FIXME! w/Replacement?? If so, like "ar r @var{archive} @var{names}" --> |
| <!-- else like "ar q..." --> |
| Add each named <var>member</var> as a module in the current archive. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>CLEAR</code><dd>Discard the contents of the current archive, canceling the effect of |
| any operations since the last <code>SAVE</code>. May be executed (with no |
| effect) even if no current archive is specified. |
| |
| <br><dt><code>CREATE </code><var>archive</var><dd>Creates an archive, and makes it the current archive (required for many |
| other commands). The new archive is created with a temporary name; it |
| is not actually saved as <var>archive</var> until you use <code>SAVE</code>. |
| You can overwrite existing archives; similarly, the contents of any |
| existing file named <var>archive</var> will not be destroyed until <code>SAVE</code>. |
| |
| <br><dt><code>DELETE </code><var>module</var><code>, </code><var>module</var><code>, ... </code><var>module</var><dd>Delete each listed <var>module</var> from the current archive; equivalent to |
| ‘<samp><span class="samp">ar -d </span><var>archive</var> <var>module</var><span class="samp"> ... </span><var>module</var></samp>’. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>DIRECTORY </code><var>archive</var><code> (</code><var>module</var><code>, ... </code><var>module</var><code>)</code><dt><code>DIRECTORY </code><var>archive</var><code> (</code><var>module</var><code>, ... </code><var>module</var><code>) </code><var>outputfile</var><dd>List each named <var>module</var> present in <var>archive</var>. The separate |
| command <code>VERBOSE</code> specifies the form of the output: when verbose |
| output is off, output is like that of ‘<samp><span class="samp">ar -t </span><var>archive</var> |
| <var>module</var><span class="samp">...</span></samp>’. When verbose output is on, the listing is like |
| ‘<samp><span class="samp">ar -tv </span><var>archive</var> <var>module</var><span class="samp">...</span></samp>’. |
| |
| <p>Output normally goes to the standard output stream; however, if you |
| specify <var>outputfile</var> as a final argument, <samp><span class="command">ar</span></samp> directs the |
| output to that file. |
| |
| <br><dt><code>END</code><dd>Exit from <samp><span class="command">ar</span></samp>, with a <code>0</code> exit code to indicate successful |
| completion. This command does not save the output file; if you have |
| changed the current archive since the last <code>SAVE</code> command, those |
| changes are lost. |
| |
| <br><dt><code>EXTRACT </code><var>module</var><code>, </code><var>module</var><code>, ... </code><var>module</var><dd>Extract each named <var>module</var> from the current archive, writing them |
| into the current directory as separate files. Equivalent to ‘<samp><span class="samp">ar -x |
| </span><var>archive</var> <var>module</var><span class="samp">...</span></samp>’. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>LIST</code><dd>Display full contents of the current archive, in “verbose” style |
| regardless of the state of <code>VERBOSE</code>. The effect is like ‘<samp><span class="samp">ar |
| tv </span><var>archive</var></samp>’. (This single command is a <span class="sc">gnu</span> <samp><span class="command">ar</span></samp> |
| enhancement, rather than present for MRI compatibility.) |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>OPEN </code><var>archive</var><dd>Opens an existing archive for use as the current archive (required for |
| many other commands). Any changes as the result of subsequent commands |
| will not actually affect <var>archive</var> until you next use <code>SAVE</code>. |
| |
| <br><dt><code>REPLACE </code><var>module</var><code>, </code><var>module</var><code>, ... </code><var>module</var><dd>In the current archive, replace each existing <var>module</var> (named in |
| the <code>REPLACE</code> arguments) from files in the current working directory. |
| To execute this command without errors, both the file, and the module in |
| the current archive, must exist. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| <br><dt><code>VERBOSE</code><dd>Toggle an internal flag governing the output from <code>DIRECTORY</code>. |
| When the flag is on, <code>DIRECTORY</code> output matches output from |
| ‘<samp><span class="samp">ar -tv </span></samp>’<small class="dots">...</small>. |
| |
| <br><dt><code>SAVE</code><dd>Commit your changes to the current archive, and actually save it as a |
| file with the name specified in the last <code>CREATE</code> or <code>OPEN</code> |
| command. |
| |
| <p>Requires prior use of <code>OPEN</code> or <code>CREATE</code>. |
| |
| </dl> |
| |
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| |
