The useradd program is located in the /usr/sbin/ directory, and on most systems it is accessible only by the root (i.e., administrative) user.

On some systems this program might be called adduser.

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If all you want to do is add a path for your current user, you can leave the other PATH= lines untouched, and just add a line like this to the end of the file: If you add this to the end of the .bash_profile file in your home directory, it takes effect every time your user starts a new shell session.

If you add this to /etc/profile, it takes effect for every user on the system.

Since the pathnames are searched in order, you probably want to add your new path at the end of the variable as we've done here.

If instead you typed: Your new path would be searched before, not after, the default system paths.

/etc/skel allows a system administrator to create a default home directory for all new users on a computer or network and thus to make certain that all users begin with the same settings or environment.

Several user configuration files are placed in /etc/skel by default when the operating system is installed.In Linux, the PATH environment variable stores the names of paths that will be searched for the executable files of any commands typed in at the command line.The value of the PATH environment variable is a string containing a series of pathnames, each delimited by a colon.The /etc/skel directory contains files and directories that are automatically copied over to a new user's home directory when such user is created by the useradd program.A home directory, also called a login directory, is the directory on Unix-like operating systems that serves as the repository for a user's personal files, directories and programs, including personal configuration files.Note that you need administrator privileges if you want to edit /etc/profile, so you can use sudo (or be logged in as root) to do so.