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expr
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<p>expr is a <a href="/facts/Command-line_interface/R9JpGmXQ">command line</a> utility on <a href="/facts/Unix/0pNL2seI">Unix</a> and <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> <a href="/facts/Operating_system/8XTuvMh2">operating systems</a> which evaluates an <a href="/facts/Expression_(mathematics)/MPrMlYbE">expression</a> and outputs the corresponding value. It first appeared in <a href="/facts/Version_7_Unix/ju5nRs7k">Unix v7</a>. The command is available for <a href="/facts/Microsoft_Windows/bwhAhuSL">Microsoft Windows</a> as part of the <a href="/facts/UnxUtils/CsUBGmUM">UnxUtils</a> collection of <a href="/facts/Native_(computing)/yNez4jAK">native</a> <a href="/facts/Windows_API/RRw4RtTu">Win32</a> <a href="/facts/Porting/7s6tFs8B">ports</a> of common <a href="/facts/GNU/HlAKKBdt">GNU</a> Unix-like utilities. The expr command has also been ported to the <a href="/facts/IBM_i/lsIRAUvn">IBM i</a> operating system. </p>