{"id":389,"date":"2022-06-06T13:28:45","date_gmt":"2022-06-06T05:28:45","guid":{"rendered":"http:\/\/purplepoolobservatory.com\/?p=389"},"modified":"2022-10-01T14:57:58","modified_gmt":"2022-10-01T06:57:58","slug":"shell%e5%b0%8f%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/purplepoolobservatory.com\/?p=389","title":{"rendered":"shell\u5c0f\u6280\u5de7"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\">1.seq\u5d4c\u5165for\u5faa\u73af<\/h2>\n\n\n\n<p>for i in $(seq 0 10)<br>do<br>    xxxxxx<br>done<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.expr\u4e0d\u652f\u6301\u975e\u6574\u578b\u8fd0\u7b97<\/h2>\n\n\n\n<p>###############<br>c=echo &#8220;13.2-10.1&#8221; | bc<br>echo $c<br>###############<br>a=13.2<br>b=10.1<br>c=$(echo &#8220;$a-$b&#8221; | bc)<br>echo $c<\/p>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3. bc\u8ba1\u7b97\u7cbe\u5ea6<\/h2>\n\n\n\n<p>echo &#8220;6\/9&#8221; | bc \u7684\u8ba1\u7b97\u7ed3\u679c\u4f1a\u662f0\uff0c\u53ef\u4ee5\u4e8b\u5148\u8bbe\u7f6e\u7cbe\u5ea6<br>echo &#8220;scale=3;6\/9&#8221; | bc\u5c31\u4f1a\u5f97\u5230\u6307\u5b9a\u7cbe\u5ea6\u7684\u7ed3\u679c<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. gawk\u4e2d\u8c03\u7528shell\u53d8\u91cf<\/h2>\n\n\n\n<p>awk -v awk\u53d8\u91cf\u540d= shell\u53d8\u91cf\u540d<\/p>\n\n\n\n<p>&nbsp;#!\/bin\/bash<\/p>\n\n\n\n<p>var4bash=test<\/p>\n\n\n\n<p>awk -v var4awk=&#8221;$var4bash&#8221; &nbsp;&#8216;BEGIN { print &nbsp;var4awk}&#8217;&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.seq\u5d4c\u5165for\u5faa\u73af for i in $(seq 0 10)do xxxxxxdone 2.expr\u4e0d\u652f &hellip; <a href=\"https:\/\/purplepoolobservatory.com\/?p=389\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cshell\u5c0f\u6280\u5de7\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-389","post","type-post","status-publish","format-gallery","hentry","category-technology","post_format-post-format-gallery"],"_links":{"self":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=389"}],"version-history":[{"count":4,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions"}],"predecessor-version":[{"id":421,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions\/421"}],"wp:attachment":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}