Every user<\/FONT><\/A> who has access to a Linux system needs a login and a password. Each user must belong to a primary group and for security or access purposes can belong to several secondary groups.<\/FONT><\/FONT><\/P> In order to create new logins, modify or delete users, you must already be logged in as root<\/B>.<\/FONT> The root login is the highest level and only certain individuals should have access to the root account.<\/FONT><\/P> Example: To add a new user with<\/EM><\/FONT><\/P> <\/A><\/FONT> <\/P> Options:<\/FONT><\/P> Example: To add the group ‘others’ to the user roger<\/I><\/FONT><\/P> Options:<\/FONT><\/P> Example: To remove the user ‘roger’ and his home directory<\/EM><\/FONT><\/P> Example: To change the password for the account you are currently logged in as…<\/EM><\/FONT><\/P> passwd<\/B> Example: To change the password for the user ‘roger’ (only you are logged in as root)…<\/EM><\/FONT><\/P> passwd roger<\/FONT><\/B> User names<\/FONT><\/STRONG> and primary groups are stored in \/etc\/passwd. <\/STRONG>This file can be directly edited using the ‘vi’ editor, although this is not recommended<\/B>. <\/FONT>Format of the file is…<\/FONT><\/FONT><\/P> Each field is separated by a colon.<\/FONT><\/P> Passwords<\/STRONG> for each user are stored in \/etc\/shadow<\/STRONG>. This file should only be changed using the passwd<\/B> command.<\/FONT><\/FONT><\/P> Group<\/STRONG> information is stored in \/etc\/group<\/STRONG>. This file can be directly edited using the ‘vi’ editor. Format of the file is…<\/FONT><\/P> Each field is separated by a colon.<\/FONT><\/P> Default files<\/B><\/FONT><\/P> When a new user is created, the default files and directories that are created are stored in \/etc\/skel<\/B>.<\/FONT><\/P> This directory can be modified to fit your needs. Modifications only effect new users and does not change anything for existing users.<\/FONT><\/FONT><\/P> To switch to another user, use the su<\/B> command. This is most commonly used to switch to the root account.<\/FONT><\/P> Example: To switch to root account…<\/EM> Example: To switch to the user ‘roger’…<\/EM> To return to original user, enter exit<\/FONT><\/STRONG><\/FONT><\/P><\/BLOCKQUOTE> Every user who has access to a Linux system needs a login and a password. Each user must belong to a primary group and for security or access purposes can belong to several secondary groups. In order to create new logins, modify or delete users, you must already be logged in as root. The root … Continue reading Linux user commands<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[118],"class_list":["post-467","post","type-post","status-publish","format-standard","hentry","category-linux","tag-commands"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=467"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/467\/revisions"}],"predecessor-version":[{"id":903,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/467\/revisions\/903"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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\nuseradd<\/FONT> – Adding a new user<\/FONT><\/A><\/FONT><\/H3>Options: <\/FONT>
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\nuseradd -gusers -Gmgmt -s\/bin\/shell -pxxxx -d\/home\/roger -m roger<\/FONT><\/H4>
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<\/p>\nusermod<\/FONT> – Modifying existing user<\/FONT><\/A><\/FONT><\/H3>
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\nusermod -Gothers roger<\/FONT><\/H4>
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<\/p>\nuserdel <\/FONT>– Deleting a user<\/FONT><\/A><\/FONT><\/H3>
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\nuserdel -r roger<\/FONT><\/H4>
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<\/p>\npasswd<\/FONT> – User’s Password<\/FONT><\/A><\/FONT><\/H3>Options: <\/FONT>
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Enter existing password<\/B>
Enter new password<\/B>
Enter new password again<\/B> (to validate)<\/FONT><\/P><\/BLOCKQUOTE>
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Enter existing password<\/B><\/FONT> (can be either roger’s password or root’s password)
Enter new password<\/B><\/FONT>
Enter new password again<\/B><\/FONT> (to validate)<\/FONT><\/P><\/BLOCKQUOTE>
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<\/p>\nWhere user and group information stored<\/FONT><\/A><\/FONT><\/H3>
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<\/p>\nsu<\/FONT> – Switch User<\/FONT><\/A><\/FONT><\/H3>
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su<\/FONT><\/B>
Enter root’s passwd<\/B><\/FONT><\/FONT><\/P>
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su roger<\/FONT><\/B>
Enter roger’s or root’s passwd<\/B><\/FONT><\/FONT><\/P>
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