{"id":18675,"date":"2014-12-25T06:16:19","date_gmt":"2014-12-24T22:16:19","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2014\/12\/25\/%e8%a7%a3%e6%b1%ba-ubuntu-%e5%9c%a8-shell-script-%e4%b8%ad%e7%84%a1%e6%b3%95%e5%9f%b7%e8%a1%8c-let-%e7%9a%84%e5%95%8f%e9%a1%8c\/"},"modified":"2021-03-18T17:24:14","modified_gmt":"2021-03-18T09:24:14","slug":"%e8%a7%a3%e6%b1%ba-ubuntu-%e5%9c%a8-shell-script-%e4%b8%ad%e7%84%a1%e6%b3%95%e5%9f%b7%e8%a1%8c-let-%e7%9a%84%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2014\/12\/25\/%e8%a7%a3%e6%b1%ba-ubuntu-%e5%9c%a8-shell-script-%e4%b8%ad%e7%84%a1%e6%b3%95%e5%9f%b7%e8%a1%8c-let-%e7%9a%84%e5%95%8f%e9%a1%8c\/","title":{"rendered":"\u89e3\u6c7a Ubuntu \u5728 Shell Script \u4e2d\u7121\u6cd5\u57f7\u884c let \u7684\u554f\u984c"},"content":{"rendered":"<p>\u5728 Ubuntu Server \u57f7\u884c Shell Script \u6642\u51fa\u73fe\u4e0b\u9762\u7684\u8a0a\u606f<br \/># <span style=\"color: #ff0000\">sh firewall.t<\/span><br \/><span style=\"color: #0000ff\">Set external &#8230;&#8230;<\/span><\/p>\n<p><span style=\"color: #0000ff\">firewall.t: 43: firewall.t: let: not found<\/span><br \/><span style=\"color: #0000ff\">firewall.t: 44: firewall.t: let: not found<\/span><br \/><span style=\"color: #0000ff\">firewall.t: 45: firewall.t: let: not found<\/span><br \/><span style=\"color: #0000ff\">firewall.t: 46: firewall.t: let: not found<\/span><\/p>\n<p>\u770b\u8d77\u4f86\u4f3c\u4e4e\u662f\u627e\u4e0d\u5230 let \u9019\u4e00\u500b\u547d\u4ee4\uff0c\u4f46\u9019\u500b Shell Script \u5728 CentOS \u4e0a\u662f\u6c92\u6709\u554f\u984c\u7684[@more@]\u5728\u7db2\u8def\u4e0a\u641c\u5c0b\u4e86\u4e00\u4e0b\uff0c\u627e\u5230\u4e86\u9019\u4e00\u7bc7 <a href=\"http:\/\/stackoverflow.com\/questions\/6409778\/let-internal-shell-command-doesnt-work-in-a-shell-script\" target=\"_blank\" rel=\"noopener noreferrer\">unix &#8211; &#8220;let&#8221; internal shell command doesn&#8217;t work in a shell script? &#8211; Stack Overflow<\/a><br \/>\u672c\u4f86\u662f<br \/><span style=\"color: #0000ff\">a=0<\/span><br \/><span style=\"color: #0000ff\">let &#8220;a=a+1&#8221;<\/span><\/p>\n<p>\u6539\u7528<br \/><span style=\"color: #ff0000\">a=0<\/span><br \/><span style=\"color: #ff0000\">a=$(($a+1))<\/span><br \/>\u53ef\u4ee5\u7528\u9019\u7a2e\u65b9\u5f0f\u4f86\u505a\u8655\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Ubuntu Server \u57f7\u884c Shell Script \u6642\u51fa\u73fe\u4e0b\u9762\u7684\u8a0a\u606f# sh firewall.t &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/2blog.ilc.edu.tw\/25793\/2014\/12\/25\/%e8%a7%a3%e6%b1%ba-ubuntu-%e5%9c%a8-shell-script-%e4%b8%ad%e7%84%a1%e6%b3%95%e5%9f%b7%e8%a1%8c-let-%e7%9a%84%e5%95%8f%e9%a1%8c\/\" class=\"more-link\">\u95b1\u8b80\u5168\u6587<span class=\"screen-reader-text\">\u3008\u89e3\u6c7a Ubuntu \u5728 Shell Script \u4e2d\u7121\u6cd5\u57f7\u884c let \u7684\u554f\u984c\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[134,119],"tags":[],"class_list":["post-18675","post","type-post","status-publish","format-standard","hentry","category-c-78479","category-c-78464"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["546510"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/18675"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=18675"}],"version-history":[{"count":1,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/18675\/revisions"}],"predecessor-version":[{"id":20291,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/18675\/revisions\/20291"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=18675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=18675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=18675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}