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Nazwa</th>Opis</th></tr> uc</td>return upper-case version of a string</td></tr> ucfirst</td>return a string with just the next letter in upper case</td></tr> umask</td>set file creation mode mask</td></tr> undef</td>remove a variable or function definition</td></tr> unlink</td>remove one link to a file</td></tr> unpack</td>convert binary structure into normal perl variables</td></tr> unshift</td>prepend more elements to the beginning of a list</td></tr> untie</td>break a tie binding to a variable</td></tr> use</td>load in a module at compile time</td></tr> utime</td>set a file's last access and modify times</td></tr> </tbody> </table>

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