{"id":259,"date":"2010-01-24T01:32:00","date_gmt":"2010-01-24T01:32:00","guid":{"rendered":"http:\/\/blog.trungson.com\/?p=259"},"modified":"2010-01-24T01:32:00","modified_gmt":"2010-01-24T01:32:00","slug":"display-return-code-of-a-shell-command","status":"publish","type":"post","link":"http:\/\/blog.trungson.com\/?p=259","title":{"rendered":"DIsplay return code of a shell command"},"content":{"rendered":"<p>If you need to determine the return code for shell scripting, you can use &#8220;$?&#8221;<\/p>\n<pre>\n# ifconfig | grep eth0 >\/dev\/null 2>&1\n# echo $?\n0 => good\/found\n<\/pre>\n<pre>\n# ifconfig | grep eth1111 >\/dev\/null 2>&1\n# echo $?\n1 => bad\/not found\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>If you need to determine the return code for shell scripting, you can use &#8220;$?&#8221; # ifconfig | grep eth0 >\/dev\/null 2>&#038;1 # echo $? 0 => good\/found # ifconfig | grep eth1111 >\/dev\/null 2>&#038;1 # echo $? 1 => bad\/not found<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts\/259"}],"collection":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=259"}],"version-history":[{"count":0,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts\/259\/revisions"}],"wp:attachment":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=259"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}