{"id":12137,"date":"2019-03-22T11:42:41","date_gmt":"2019-03-22T11:42:41","guid":{"rendered":"http:\/\/www.appservgrid.com\/paw92\/?p=12137"},"modified":"2019-03-22T11:42:41","modified_gmt":"2019-03-22T11:42:41","slug":"how-to-save-top-command-output-to-a-file","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2019\/03\/22\/how-to-save-top-command-output-to-a-file\/","title":{"rendered":"How to Save Top Command Output to a File"},"content":{"rendered":"

Linux\u00a0top command<\/a>\u00a0is highly used by system administrators to display system statistics in real time regarding\u00a0system uptime<\/strong>\u00a0and\u00a0load average<\/strong>,\u00a0used memory<\/strong>,\u00a0running tasks<\/strong>, a summary of processes or threads and detailed information about each running process.<\/p>\n

However, besides real time viewing of the running system,\u00a0top command<\/a>\u00a0output can be saved to a file, by using the\u00a0-b<\/code>\u00a0flag, which instructs\u00a0top to operate in batch mode<\/a>\u00a0and\u00a0-n<\/code>\u00a0flag to specify the amount of iteration the command should output.<\/p>\n

In the below example, we\u2019ll redirect the output of\u00a0top command<\/strong>\u00a0to\u00a0top.txt<\/code>\u00a0file in the current working directory. The\u00a0-n<\/strong>\u00a0argument will be used to send only one snapshot of the command to the mentioned file.<\/p>\n

$ top -b -n 1 > top.txt\r\n<\/pre>\n
To read the resulted file, use a command line file reader utility, such as\u00a0cat command<\/a>,\u00a0less or more<\/a>.<\/p>\n
$ less top.txt\r\n<\/pre>\n
\n
\"View<\/a><\/p>\n
View Output of Top Command<\/p>\n
To grab five iteration of\u00a0top command<\/strong>, execute the command as shown in the below excerpt.<\/p>\n
$ top -b -n 5 > top-5iterations.txt\r\n<\/pre>\n
In order to display only the number of running tasks from the resulted file, use the\u00a0grep filter<\/a>, as shown in the below command example.<\/p>\n
$ cat top-5iterations.txt | grep Tasks\r\n<\/pre>\n
\n
\"Show<\/a><\/p>\n
Show Top 5 Running Tasks<\/p>\n<\/div>\n
To take a snapshot of a specific process in\u00a0top utility<\/strong>, execute command with the\u00a0PID<\/strong>\u00a0(-p)<\/code>\u00a0flag. To get the\u00a0PID of a running process<\/a>, issue\u00a0pidof command<\/strong>\u00a0against the name of the running process.<\/p>\n
In this example we\u2019ll monitor the\u00a0cron<\/strong>\u00a0process via\u00a0top command<\/strong>\u00a0by taking three snapshots of the PID.<\/p>\n
$ pidof crond\r\n$ top -p 678 -b -n3 > cron.txt\r\n$ cat cron.txt\r\n<\/pre>\n
\n
\"Watch<\/a><\/p>\n
Watch Process Usage in Top Command<\/p>\n<\/div>\n
Using a\u00a0for<\/strong>\u00a0iteration loop, we can display a process statistics via its PID, each two seconds, as shown in the below example. The output of the loop can also be redirected to a file. We\u2019ll use the same cron PID as shown in the above example.<\/p>\n
$ for i in {1..4}; do sleep 2 && top -b -p 678 -n1 | tail -1 ; done\t\r\n<\/pre>\n
Redirect loop output to file.<\/p>\n
$ for i in {1..4}; do sleep 2 && top -b -p 678 -n1 | tail -1 ; done >> cron.txt\r\n$ cat cron.txt\r\n<\/pre>\n
\n
\"Find<\/a><\/p>\n
Find Linux Process Statistics<\/p>\n<\/div>\n
These are just a few examples on how you can monitor and gather system and process statistics via\u00a0top command<\/strong>.<\/p>\n
Source<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Linux\u00a0top command\u00a0is highly used by system administrators to display system statistics in real time regarding\u00a0system uptime\u00a0and\u00a0load average,\u00a0used memory,\u00a0running tasks, a summary of processes or threads and detailed information about each running process. However, besides real time viewing of the running system,\u00a0top command\u00a0output can be saved to a file, by using the\u00a0-b\u00a0flag, which instructs\u00a0top to operate … <\/p>\n
Continue reading “How to Save Top Command Output to a File”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-12137","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/comments?post=12137"}],"version-history":[{"count":1,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12137\/revisions"}],"predecessor-version":[{"id":12138,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/12137\/revisions\/12138"}],"wp:attachment":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/media?parent=12137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/categories?post=12137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/tags?post=12137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}