{"id":140157,"date":"2019-03-29T08:46:24","date_gmt":"2019-03-29T00:46:24","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=140157"},"modified":"2019-03-25T13:44:20","modified_gmt":"2019-03-25T05:44:20","slug":"watch-free-hand","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/watch-free-hand.html","title":{"rendered":"watch\u89e3\u653e\u4f60\u7684\u53cc\u624b"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u91cd\u590d\u6267\u884c\u67d0\u4e2a\u547d\u4ee4\uff0c\u89c2\u5bdf\u67d0\u4e2a\u6587\u4ef6\u548c\u67d0\u4e2a\u7ed3\u679c\u7684\u53d8\u5316\u60c5\u51b5\u3002\u53ef\u4ee5\u5199\u811a\u672c\u53bb\u5b9e\u73b0\u8fd9\u4e9b\u9700\u6c42\uff0c\u4f46\u662f\u6709\u66f4\u7b80\u5355\u7684\u65b9\u6cd5\uff0c\u672c\u6587\u6863\u8981\u4ecb\u7ecd\u7684\u5c31\u662fwatch\u547d\u4ee4\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>1. \u4ee5\u56fa\u5b9a\u65f6\u95f4\u53cd\u590d\u6267\u884c\u67d0\u4e2a\u547d\u4ee4<\/strong><\/div>\n<pre>\r\nroot@jaking-virtual-machine:~# watch -n 1 cat hello.txt \r\nEvery 1.0s: cat hello.txt                                                                    \r\njaking-virtual-machine: Tue Mar 19 19:13:33 2019\r\n\r\nHello World!\r\nHello Jaking!\r\n<\/pre>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>2. \u9ad8\u4eae\u53d8\u5316\u5185\u5bb9<\/strong><\/div>\n<pre>\r\nroot@jaking-virtual-machine:~# watch -d uptime   #\u4e3a\u4e86\u7a81\u51fa\u53d8\u5316\u90e8\u5206\uff0c\u53ef\u4ee5\u4f7f\u7528 -d\uff08difference\uff09\u53c2\u6570\u3002\r\nEvery 2.0s: uptime                                                                           \r\njaking-virtual-machine: Tue Mar 19 19:14:01 2019\r\n\r\n 19:14:01 up 3 days, 12:53,  2 users,  load average: 0.01, 0.01, 0.00\r\n\uff08\u8fd9\u91cc\u7701\u7565\uff0c\u53d8\u5316\u5185\u5bb9\u4f1a\u9ad8\u4eae\uff0c\u975e\u5e38\u4fbf\u4e8e\u89c2\u5bdf\uff09\r\n<\/pre>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>3. \u6267\u884c\u51fa\u9519\u65f6\u9000\u51fa<\/strong><\/div>\n<pre>\r\nroot@jaking-virtual-machine:~# watch -n 1 -e cat hello.txt    #\u8fd0\u884c\u67d0\u4e2a\u547d\u4ee4\uff0c\u5f53\u9000\u51fa\u7801\u4e0d\u662f0\u65f6\uff0c\u5373\u547d\u4ee4\u6267\u884c\u51fa\u9519\u65f6\u5c31\u7ed3\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528 -e\uff08errexit\uff09\u53c2\u6570\u3002\r\nEvery 1.0s: cat hello.txt                                                                  \r\njaking-virtual-machine: Tue Mar 19 19:16:49 2019\r\n<\/pre>\n<p><strong>\u6253\u5f00\u53e6\u4e00\u4e2a\u7ec8\u7aef\uff0c\u6267\u884cmv\u64cd\u4f5c\uff0c\u53ef\u4ee5\u770b\u5230\u6548\u679c\uff1a<\/strong><\/p>\n<pre>\r\nroot@jaking-virtual-machine:~# mv hello.txt \/tmp\r\n#\u65b0\u7ec8\u7aef\r\nroot@jaking-virtual-machine:~# watch -n 1 -e cat hello.txt \r\n#\u65e7\u7ec8\u7aef\r\nEvery 1.0s: cat hello.txt                                                                  \r\njaking-virtual-machine: Tue Mar 19 19:16:49 2019\r\n\r\ncat: hello.txt: No such file or directory\r\n<\/pre>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>4. \u6267\u884c\u7ed3\u679c\u53d8\u5316\u65f6\u9000\u51fa<\/strong><\/div>\n<pre>\r\nroot@jaking-virtual-machine:~# watch -n 1 -g 'du -b hello.txt'                                                                            \r\nEvery 1.0s: du -b hello.txt                                                                \r\njaking-virtual-machine: Tue Mar 19 19:23:41 2019\r\n\r\n27      hello.txt\r\n<\/pre>\n<p><strong>\u6253\u5f00\u53e6\u4e00\u4e2a\u7ec8\u7aef\u6267\u884cecho\u64cd\u4f5c\uff0c\u53ef\u4ee5\u770b\u5230\u6548\u679c\uff1a<\/strong><\/p>\n<pre>\r\nroot@jaking-virtual-machine:~# echo \"watch -n -l -g command\" >> hello.txt \r\n#\u65b0\u7ec8\u7aef\r\n\r\nroot@jaking-virtual-machine:~# watch -n 1 -g 'du -b hello.txt'  \r\n#\u65e7\u7ec8\u7aef                                                                          \r\nEvery 1.0s: du -b hello.txt                                                                \r\njaking-virtual-machine: Tue Mar 19 19:21:55 2019\r\n\r\n50      hello.txt\r\n#\u6b64\u65f6watch -n 1 -g 'du -b hello.txt'\u8fd0\u884c\u7ed3\u675f\r\n\r\nroot@jaking-virtual-machine:~#\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>root@jaking-virtual-machine:~# watch -n 1 cat hello.txt [&hellip;]<\/p>\n","protected":false},"author":63,"featured_media":140158,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-140157","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\/140157","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\/63"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=140157"}],"version-history":[{"count":4,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/140157\/revisions"}],"predecessor-version":[{"id":140750,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/140157\/revisions\/140750"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/140158"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=140157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=140157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=140157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}