\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8fd0\u7b97<\/strong><\/div>\n
$\"\"$ <\/p>\n
\u6574\u6570\u8fd0\u7b97<\/strong><\/div>\n
\u5728shell\u4e2d\uff0c\u6709\u4e24\u79cd\u65b9\u5f0f\u80fd\u5b9e\u73b0\u6574\u6570\u8fd0\u7b97\uff0c\u4e00\u79cd\u662f\u4f7f\u7528expr\u547d\u4ee4\uff0c \u53e6\u5916\u4e00\u79cd\u662f\u901a\u8fc7\u65b9\u62ec\u53f7\uff08$[]\uff09\u6765\u5b9e\u73b0\u3002<\/p>\n
expr<\/strong><\/span><\/div>\n
\r\n#!\/bin\/bash\r\n#\u8f93\u51fa13\r\nexpr 10 + 3\r\n\r\n#\u8f93\u51fa10+3\r\nexpr 10+3\r\n\r\n#\u8f93\u51fa7\r\nexpr 10 - 3\r\n\r\n#\u8f93\u51fa30\r\nexpr 10 \\* 3\r\n\r\n#\u8f93\u51fa3\r\nexpr 10 \/ 3\r\n\r\n#\u8f93\u51fa1\r\nexpr 10 % 3\r\n\r\n#\u5c06\u8ba1\u7b97\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf\r\nnum1=$(expr 10 % 3)\r\n\r\n#\u5c06\u8ba1\u7b97\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf\r\nnum2=`expr 10 % 3`\r\n<\/pre>\n
\u5728\u4ee5\u4e0a\u7684\u4e58\u6cd5(*)\u4e2d\uff0c\u6211\u4eec\u7528\u4e86\u53cd\u659c\u7ebf\uff08\\\uff09\u6765\u8f6c\u4e49<\/div>\n
\u8fd0\u7b97\u7b26\u524d\u540e\u5fc5\u987b\u8fd8\u6709\u7a7a\u683c\uff0c\u5426\u5219\u4f1a\u88ab\u76f4\u63a5\u5f53\u4f5c\u5b57\u7b26\u4e32\u8fd4\u56de<\/div>\n
\u5982\u679c\u8981\u5c06\u8ba1\u7b97\u7ed3\u679c\u4fdd\u5b58\u5230\u53d8\u91cf\uff0c\u5c31\u9700\u8981\u7528\u5230\u6211\u4eec\u4e0a\u7bc7\u6587\u7ae0\u8bb2\u5230\u7684\u90a3\u4e24\u79cd\u65b9\u5f0f\uff08$() \u6216\u8005 ``\uff09\u6765\u66ff\u6362\u547d\u4ee4<\/div>\n
\u65b9\u62ec\u53f7($[])<\/strong><\/span><\/div>\n
\r\n#!\/bin\/bash\r\nnum1=10\r\nnum2=3\r\n#\u8f93\u51fanum1 + num2=13\r\necho \"num1 + num2=$[$num1 + $num2]\"\r\n\r\n#\u8f93\u51fanum1+num2=13\r\necho \"num1+num2=$[$num1+$num2]\"\r\n\r\n#\u8f93\u51fanum1 - num2=7\r\necho \"num1 - num2=$[$num1 - $num2]\"\r\n\r\n#\u8f93\u51fanum1 * num2=30\r\necho \"num1 * num2=$[$num1 * $num2]\"\r\n\r\n#\u8f93\u51fanum1 > num2=1\r\necho \"num1 > num2=$[$num1 > $num2]\"\r\n\r\n#\u8f93\u51fanum1 < num2=0\r\necho \"num1 < num2=$[$num1 < $num2]\"\r\n\r\n#\u5c06\u8fd0\u7b97\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf\uff0c\u8f93\u51fanum3=3\r\nnum3=$[$num1 \/ $num2]\r\necho \"num3=$num3\"\r\n<\/pre>\n
\u6d6e\u70b9\u8fd0\u7b97<\/strong><\/div>\n
\u5728shell\u4e2d\uff0c\u505a\u6d6e\u70b9\u8fd0\u7b97\u4e00\u822c\u662f\u7528bash\u7684\u8ba1\u7b97\u5668(bc)\u3002\u5728shell\u811a\u672c\u4e2d\uff0c\u4e00\u822c\u6211\u4eec\u7684\u4f7f\u7528\u65b9\u6cd5\u662f\uff1a
\nvariable=$(echo \"options; expression\" | bc)<\/span>
\noptions\u662fbc\u7684\u4e00\u4e9b\u9009\u9879\uff0c\u4f8b\u5982\uff1a \u53ef\u4ee5\u901a\u8fc7scale\u53bb\u8bbe\u7f6e\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u5177\u4f53\u6709\u54ea\u4e9b\u53c2\u6570\uff0c\u53ef\u4ee5man bc\u8fdb\u884c\u67e5\u770b
\nexpression\u5c31\u662f\u6211\u4eec\u5177\u4f53\u7684\u8868\u8fbe\u5f0f\uff0c\u4f8b\u5982 10 * 3
\n\" | \" \u8fd9\u4e2a\u7b26\u53f7\uff0c\u5bf9\u4e8e\u719f\u6089linux\u7cfb\u7edf\u7684\u4eba\u6765\u8bf4\uff0c\u8fd9\u4e2a\u518d\u719f\u6089\u4e0d\u8fc7\u4e86\u3002\u5b83\u53eb\u505a\u7ba1\u9053\uff0c \u4e4b\u6240\u4ee5\u4f1a\u53eb\u505a\u7ba1\u9053\uff0c\u5176\u5b9e\u5f88\u5f62\u8c61\uff0c\u4f60\u53ef\u4ee5\u628a\u5b83\u770b\u4f5c\u4e00\u6839\u6c34\u7ba1\uff0c\u6c34\u7ba1\u4e00\u5934\u63a5\u5165\u524d\u4e00\u4e2a\u547d\u4ee4\u7684\u8fd4\u56de\u7ed3\u679c, \u4e00\u5934\u63a5\u5165\u4e0b\u4e00\u4e2a\u547d\u4ee4\u3002\u8868\u793a\u5c06\u524d\u4e00\u4e2a\u547d\u4ee4\u7684\u6267\u884c\u7ed3\u679c\u4f5c\u4e3a\u540e\u4e00\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u8f93\u5165\u3002\u4ee5\u4e0a\uff0c\u8868\u793a\u5c06\u6211\u4eec\u7684\u8868\u8fbe\u5f0f\u4f5c\u4e3abc\u7684\u53c2\u6570\u8f93\u5165\u3002<\/p>\n
\r\n#!\/bin\/bash\r\n#\u8868\u793a 10\/3\uff0c \u4fdd\u75592\u4f4d\u5c0f\u6570\uff0c\u5c06\u7ed3\u679c\u8d4b\u503c\u7ed9\u4e86num, \u8f93\u51fa3.33\r\nnum=$(echo \"scale=2; 10 \/ 3\" | bc)\r\necho $num\r\n<\/pre>\n
\n
\u539f\u6587\u6765\u81ea\uff1ahttp:\/\/www.cnblogs.com\/dongying\/p\/6270972.html<\/a><\/p>\n
\u672c\u6587\u5730\u5740\uff1a http:\/\/lrxjmw.cn\/shell_so_easy2.html<\/a>\u7f16\u8f91\uff1a\u53f6\u5fb7\u5bbd\uff0c\u5ba1\u6838\u5458\uff1a\u9004\u589e\u5b9d<\/span><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u5bfc\u8bfb \u5982\u4eca\uff0c\u4e0d\u4f1aLinux\u7684\u7a0b\u5e8f\u5458\u90fd\u4e0d\u597d\u610f\u601d\u8bf4\u81ea\u5df1\u662f\u7a0b\u5e8f\u5458\uff0c\u4e0d\u4f1ashell\u7f16\u7a0b\u7684\u5c31\u4e0d\u80fd\u8bf4\u81ea\u5df1\u4f1alinux\u3002sh […]<\/p>\n","protected":false},"author":644,"featured_media":51317,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-54291","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/54291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/644"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=54291"}],"version-history":[{"count":9,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/54291\/revisions"}],"predecessor-version":[{"id":274867,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/54291\/revisions\/274867"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/51317"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=54291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=54291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=54291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}