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| <h4 class="subsection">10.4.3 Flags for Word Expansion</h4> |
| |
| <p>This section describes the flags that you can specify in the |
| <var>flags</var> argument to <code>wordexp</code>. Choose the flags you want, |
| and combine them with the C operator <code>|</code>. |
| |
| <dl> |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <dt><code>WRDE_APPEND</code><dd>Append the words from this expansion to the vector of words produced by |
| previous calls to <code>wordexp</code>. This way you can effectively expand |
| several words as if they were concatenated with spaces between them. |
| |
| <p>In order for appending to work, you must not modify the contents of the |
| word vector structure between calls to <code>wordexp</code>. And, if you set |
| <code>WRDE_DOOFFS</code> in the first call to <code>wordexp</code>, you must also |
| set it when you append to the results. |
| |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>WRDE_DOOFFS</code><dd>Leave blank slots at the beginning of the vector of words. |
| The <code>we_offs</code> field says how many slots to leave. |
| The blank slots contain null pointers. |
| |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>WRDE_NOCMD</code><dd>Don't do command substitution; if the input requests command substitution, |
| report an error. |
| |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>WRDE_REUSE</code><dd>Reuse a word vector made by a previous call to <code>wordexp</code>. |
| Instead of allocating a new vector of words, this call to <code>wordexp</code> |
| will use the vector that already exists (making it larger if necessary). |
| |
| <p>Note that the vector may move, so it is not safe to save an old pointer |
| and use it again after calling <code>wordexp</code>. You must fetch |
| <code>we_pathv</code> anew after each call. |
| |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>WRDE_SHOWERR</code><dd>Do show any error messages printed by commands run by command substitution. |
| More precisely, allow these commands to inherit the standard error output |
| stream of the current process. By default, <code>wordexp</code> gives these |
| commands a standard error stream that discards all output. |
| |
| <!-- wordexp.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>WRDE_UNDEF</code><dd>If the input refers to a shell variable that is not defined, report an |
| error. |
| </dl> |
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