ch08_177.htm

by Randal L. Schwartz and Tom Phoenix ISBN 0-596-00132-0 Third Edition, published July 2001. (See

<tr>
<td>
<p><tt class="literal">opendir</tt></p>
</td>
<td>
<p>Opens directory for reading; returns <tt class="literal">undef</tt> on
failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">pathconf</tt></p>
</td>
<td>
<p>Retrieves value of a configurable limit on a file or directory;
returns <tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">pause</tt></p>
</td>
<td>
<p>Similar to C function <tt class="literal">pause(3)</tt>; returns
<tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">perror</tt></p>
</td>
<td>
<p>Identical to C function <tt class="literal">perror(3)</tt></p>
</td>
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<td>
<p><tt class="literal">pipe</tt></p>
</td>
<td>
<p>Creates an interprocess channel</p>
</td>
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<td>
<p><tt class="literal">pow</tt></p>
</td>
<td>
<p>Computes <tt class="literal">$x</tt> raised to the power
<tt class="literal">$exponent</tt>
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">printf</tt></p>
</td>
<td>
<p>Prints specified arguments to STDOUT</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">putc</tt></p>
</td>
<td>
<p>C-specific; use Perl's <tt class="literal">print</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">putchar</tt></p>
</td>
<td>
<p>C-specific; use Perl's <tt class="literal">print</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">puts</tt></p>
</td>
<td>
<p>C-specific; use Perl's <tt class="literal">print</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">qsort</tt></p>
</td>
<td>
<p>C-specific; use Perl's <tt class="literal">sort</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">raise</tt></p>
</td>
<td>
<p>Sends specified signal to current process</p>
</td>
</tr>
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<td>
<p><tt class="literal">rand</tt></p>
</td>
<td>
<p>Nonportable; use Perl's <tt class="literal">rand</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">read</tt></p>
</td>
<td>
<p>Reads from a file; returns <tt class="literal">undef</tt> on failure</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">readdir</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">readdir</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">realloc</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">remove</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">unlink</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">rename</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">rename</tt>
function
</p>
</td>
</tr>
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<td>
<p><tt class="literal">rewind</tt></p>
</td>
<td>
<p>Seeks to beginning of file</p>
</td>
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<td>
<p><tt class="literal">rewinddir</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">rewinddir</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">rmdir</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">rmdir</tt> function</p>
</td>
</tr>
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<td>
<p><tt class="literal">scanf</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">&lt;&gt;</tt> and regular expressions</p>
</td>
</tr>
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<td>
<p><tt class="literal">setgid</tt></p>
</td>
<td>
<p>Sets real group ID for this process</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">setjmp</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">eval {}</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">setlocale</tt></p>
</td>
<td>
<p>Modifies and queries program's locale</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">setpgid</tt></p>
</td>
<td>
<p>Similar to C function <tt class="literal">setpgid(2)</tt>; returns
<tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">setsid</tt></p>
</td>
<td>
<p>Identical to C function <tt class="literal">setsid(8)</tt></p>
</td>
</tr>
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<td>
<p><tt class="literal">setuid</tt></p>
</td>
<td>
<p>Sets real user ID for this process</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sigaction</tt></p>
</td>
<td>
<p>Detailed signal management; returns <tt class="literal">undef</tt> on
failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">siglongjmp</tt></p>
</td>
<td>
<p>C-specific; use Perl's <tt class="literal">die</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sigpending</tt></p>
</td>
<td>
<p>Examines blocked, pending signals; returns <tt class="literal">undef</tt>
on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sigprocmask</tt></p>
</td>
<td>
<p>Changes and/or examines this process's signal mask;
returns <tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sigsetjmp</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">eval {}</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sigsuspend</tt></p>
</td>
<td>
<p>Installs signal mask and suspends process until signal arrives;
returns <tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sin</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">sin</tt> function</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sinh</tt></p>
</td>
<td>
<p>Identical to C function <tt class="literal">sinh(3)</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sleep</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">sleep</tt> function</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sprintf</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">sprintf</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sqrt</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">sqrt</tt> function</p>
</td>
</tr>
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<td>
<p><tt class="literal">srand</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">srand</tt> function</p>
</td>
</tr>
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<td>
<p><tt class="literal">sscanf</tt></p>
</td>
<td>
<p>C-specific; use regular expressions</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">stat</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">stat</tt> function</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strcat</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">.=</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strchr</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">index</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strcmp</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">eq</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strcoll</tt></p>
</td>
<td>
<p>Identical to C function <tt class="literal">strcoll(3)</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strcpy</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">=</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strcspn</tt></p>
</td>
<td>
<p>C-specific; use regular expressions</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strerror</tt></p>
</td>
<td>
<p>Returns error string for the specified <tt class="literal">errno</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strftime</tt></p>
</td>
<td>
<p>Converts date and time to string and returns the string</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strlen</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">length</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strncat</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">.=</tt> and/or <tt class="literal">substr</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strncmp</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">eq</tt> and/or <tt class="literal">substr</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strncpy</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">=</tt> and/or <tt class="literal">substr</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">stroul</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strpbrk</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strrchr</tt></p>
</td>
<td>
<p>C-specific; use <tt class="literal">rindex</tt> and/or
<tt class="literal">substr</tt>
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strspn</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strstr</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">index</tt> function</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strtod</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strtok</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strtol</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strtoul</tt></p>
</td>
<td>
<p>C-specific</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">strxfrm</tt></p>
</td>
<td>
<p>String transformation; returns the transformed string</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">sysconf</tt></p>
</td>
<td>
<p>Retrieves values of system configurable variables; returns
<tt class="literal">undef</tt> on failure
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">system</tt></p>
</td>
<td>
<p>Identical to Perl's <tt class="literal">system</tt>
function
</p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">tan</tt></p>
</td>
<td>
<p>Identical to C function <tt class="literal">tan(3)</tt></p>
</td>
</tr>
<tr>
<td>
<p><tt class="literal">tanh</tt></p>