{"id":9451,"date":"2023-11-28T21:03:39","date_gmt":"2023-11-28T13:03:39","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=9451"},"modified":"2023-11-30T21:31:47","modified_gmt":"2023-11-30T13:31:47","slug":"linux-zhong-na-yi-gebash-nei-zhi-ming-ling-neng-go","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/linux-zhong-na-yi-gebash-nei-zhi-ming-ling-neng-go\/","title":{"rendered":"Linux \u4e2d\u54ea\u4e00\u4e2a bash \u5185\u7f6e\u547d\u4ee4\u80fd\u591f\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\uff1f"},"content":{"rendered":"<p>\u5728Linux\u7684Bash shell\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>expr<\/code> \u547d\u4ee4\u8fdb\u884c\u57fa\u672c\u7684\u6570\u5b66\u8fd0\u7b97\u3002<code>expr<\/code> \u662f\u7528\u4e8e\u8fdb\u884c\u6574\u6570\u8fd0\u7b97\u7684\u5185\u7f6e\u547d\u4ee4\u3002<\/p>\n<p><code>expr<\/code> \u547d\u4ee4\u7684\u57fa\u672c\u8bed\u6cd5\u662f\uff1a<\/p>\n<pre><code class=\"language-bash\">expr &lt;expression&gt;\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u8981\u8ba1\u7b97\u4e24\u4e2a\u6570\u7684\u548c\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code class=\"language-bash\">expr 5 + 3\n<\/code><\/pre>\n<p><code>expr<\/code> \u547d\u4ee4\u652f\u6301\u52a0\u6cd5\u3001\u51cf\u6cd5\u3001\u4e58\u6cd5\u548c\u9664\u6cd5\u7b49\u57fa\u672c\u7684\u6574\u6570\u8fd0\u7b97\u3002\u5b83\u8fd8\u53ef\u4ee5\u7528\u4e8e\u6bd4\u8f83\u548c\u5b57\u7b26\u4e32\u5904\u7406\u7b49\u64cd\u4f5c\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c<code>expr<\/code> \u5bf9\u4e8e\u4e58\u6cd5\u548c\u9664\u6cd5\u9700\u8981\u4f7f\u7528 <code>\\*<\/code> \u8868\u793a\u4e58\u53f7\uff0c\u4f7f\u7528 <code>\\\/<\/code> \u8868\u793a\u9664\u53f7\u3002<\/p>\n<p>\u867d\u7136<code>expr<\/code>\u662fBash shell\u7684\u5185\u7f6e\u547d\u4ee4\u4e4b\u4e00\uff0c\u4f46\u5b83\u76f8\u5bf9\u6bd4\u8f83\u53e4\u8001\u4e14\u529f\u80fd\u6709\u9650\u3002\u5728\u8fdb\u884c\u66f4\u590d\u6742\u7684\u6570\u5b66\u8fd0\u7b97\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u5176\u4ed6\u5de5\u5177\u6216\u7f16\u7a0b\u8bed\u8a00\uff0c\u6bd4\u5982<code>bc<\/code>\u547d\u4ee4\u3001<code>awk<\/code>\u3001<code>Python<\/code>\u7b49\uff0c\u5b83\u4eec\u63d0\u4f9b\u66f4\u591a\u7684\u6570\u5b66\u8fd0\u7b97\u529f\u80fd\u548c\u7075\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Linux\u7684Bash shell\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 expr \u547d\u4ee4\u8fdb\u884c\u57fa\u672c\u7684\u6570\u5b66\u8fd0\u7b97\u3002expr \u662f\u7528\u4e8e\u8fdb\u884c\u6574\u6570\u8fd0\u7b97 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[],"class_list":["post-9451","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=9451"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9451\/revisions"}],"predecessor-version":[{"id":13756,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9451\/revisions\/13756"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=9451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=9451"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=9451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}