{"id":1090,"date":"2018-07-23T03:31:12","date_gmt":"2018-07-22T22:01:12","guid":{"rendered":"http:\/\/jaipurhosting.com\/blog\/?p=1090"},"modified":"2019-04-27T07:45:48","modified_gmt":"2019-04-27T02:15:48","slug":"10-who-command-examples-for-linux","status":"publish","type":"post","link":"https:\/\/www.jaipurhosting.com\/blog\/10-who-command-examples-for-linux\/","title":{"rendered":"10 \u2018who\u2019 Command Examples for Linux"},"content":{"rendered":"

Description<\/strong><\/p>\n

One of the various commands we mentioned was the who command which displays users who are currently logged on to a Linux system, including the terminals they are connecting from.<\/p>\n

This article will explain some useful examples of who command in Linux .<\/p>\n

The basic syntax for using who command is as follows.<\/p>\n

# who who [OPTION]... [ FILE | ARG1 ARG2 ]<\/pre>\n
 <\/p>\n
1. If you run who<\/strong> command without any arguments, it will display account information (user login name, user\u2019s terminal, time of login as well as the host the user is logged in from) on your system similar to the one shown in the following output.<\/p>\n
[root@vps ~]# who\nroot pts\/0 2018-07-23 01:04 (123.14.15.26)<\/pre>\n
 <\/p>\n
2. To print the heading of the columns displayed, use the -H flag<\/strong> as shown.<\/p>\n
[root@vps ~]# who -H\nNAME LINE TIME COMMENT\nroot pts\/0 2018-07-23 01:04 (123.14.15.26)<\/pre>\n
 <\/p>\n
3. To print the login names and total number of logged on users, use the -q flag.<\/p>\n
[root@vps ~]# who -q\nroot\n# users=1<\/pre>\n
 <\/p>\n
4. In case you want to show only hostname and user associated with stdin, use the –m switch<\/strong>.<\/p>\n
[root@vps ~]# who -m\nroot pts\/0 2018-07-23 01:04 (123.14.15.26)<\/pre>\n
 <\/p>\n
5. Next, to add user\u2019s message status as +, – or ?<\/strong>, use the -T<\/strong> option.<\/p>\n
[root@vps ~]# who -T\nroot + pts\/0 2018-07-23 01:04 (123.14.15.26)<\/pre>\n
The who command also helps you to view some useful system information such as last boot time, current runlevel (target under systemd<\/strong>), print dead processes as well as processes spawned by init<\/strong>.<\/p>\n
 <\/p>\n
6. To view the time of last system boot, use the -b flag<\/strong> and adding the -u<\/strong> option allows for listing of logged on users in the same output.<\/p>\n
[root@vps ~]# who -b\nsystem boot 2018-07-23 12:54<\/pre>\n
 <\/p>\n
7. You can check the current runlevel<\/strong> with the -r<\/strong> option.<\/p>\n
[root@vps ~]# who -r\nrun-level 3 2018-07-23 12:55<\/pre>\n
 <\/p>\n
8. The following command will print dead processes<\/strong>.<\/p>\n
[root@vps ~]# who -d\npts\/1 2018-07-23 11:10 9986 id=ts\/1 term=0 exit=<\/pre>\n
 <\/p>\n
9. Furthermore, to see active processes spawned by init, use the -p<\/strong> option.<\/p>\n
[root@vps ~]# who -p<\/pre>\n
 <\/p>\n
10. The -a flag<\/strong> allows for printing of default output combined with information from some of the options we have covered.<\/p>\n
[root@vps ~]# who -a\nsystem boot 2018-07-23 12:54\nLOGIN hvc0 2018-07-23 12:55 709 id=hvc0\nLOGIN tty1 2018-07-23 12:55 711 id=tty1\nrun-level 3 2018-07-23 12:55\nroot + pts\/0 2018-07-23 01:04 . 6861 (123.14.15.26)<\/pre>\n
 <\/p>\n
We hope you\u2019ve found this useful!<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Description One of the various commands we mentioned was the who command which displays users who are currently logged on to a Linux system, including the terminals they are connecting from. This article will explain some useful examples of who command in Linux . The basic syntax for using who command is as follows. # […]<\/p>\n","protected":false},"author":1,"featured_media":1291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1090","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/posts\/1090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/comments?post=1090"}],"version-history":[{"count":2,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/posts\/1090\/revisions"}],"predecessor-version":[{"id":1137,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/posts\/1090\/revisions\/1137"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/media\/1291"}],"wp:attachment":[{"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/media?parent=1090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/categories?post=1090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jaipurhosting.com\/blog\/wp-json\/wp\/v2\/tags?post=1090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}