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You have two approaches when creating users from a command-line environment: you can use the useradd command, or you can add users to the relevant configuration files by manually editing these files. Although this second approach editing the configuration files may be useful in an environment in which users are added from a custom-made shell script, it generally is not recommended. The reason for this is probably obvious: an error in the main user configuration files might make it impossible for every user to log in to the server. In this section, I ll discuss how to manage users from the command line using useradd and other related commands such as usermod and userdel. You can edit related configuration files to make creating users easier.

You can initiate an sftp session by using this command format: sftp <username>@<IP address> The same rules as when you re logging in with ssh apply, both in terms of formatting the login command and also confirming the encryption key if this is the first time you ve logged in. The sftp commands are fairly basic. For example, to copy a file from the remote machine, simply type this: get <filename> This will copy the file into the directory you were in on the local machine before you started the sftp session. By specifying a path after the filename, the file will be copied to the specified local directory, as in this example: get spreadsheet.xls /home/keir/downloaded_files/ Sending files from the local machine to the remote machine is just as easy:

Remember the definition of a join between two tables (from 3): a Cartesian product (all combination of rows from each table) followed by a select comparing a column in each of the tables. For a self join, we think of two copies of the same table. In Figure 5-4, we see part of the Cartesian product between two copies of the Member table. To distinguish the different bits of the product, I ve given the first copy an alias m and the second an alias c (you ll see why in a minute). In the small section of the Cartesian product visible in Figure 5-4, we see the first row (Melissa) from copy m paired with rows from copy c.

put <filename> By specifying a path after the filename, you can ensure that the file is saved to a particular remote path. One useful thing to remember is that any command preceded by an exclamation point (!, called a bang in Linux-speak) is executed on the local machine as a shell command. So, if you wanted to remove a file on the local machine, you could type this: !rm -rf <filename> Simply typing a bang symbol (the familiar exclamation mark) on its own starts a shell session on the local machine, so you can perform even more tasks. When you re finished, type exit to return to the sftp program. For a list of popular sftp commands, see Table 25-1. Table 25-1. Common sftp Commands

If you want to add users from the command line, useradd is just the ticket. And the other commands for user management are just as convenient: useradd: Adds users to the local authentication system usermod: Modifies properties for users userdel: Deletes users properly from a system passwd: Modifies passwords for users Using useradd is simple. In its easiest form, it just takes the name of a user as its argument; thus, useradd zeina creates a user called zeina to the system. However, you better use the option -m as well, because, if you don t, that user will be without a home directory. In most cases, a user should have a home directory because it allows that person to store files somewhere. Unfortunately, if you create a user without a home directory, there s really no easy way to correct this problem later (but see the following tip for the not-so-easy way).

Change the remote directory Change the local directory Download the specified file Download multiple specified files List the remote directory List the local directory