Tag: chown

By Christopher P Wakefield

This time we are going to have a look at Linux permissions. Every current operating system deals with permissions, whether it is ownership of a file or just gaining read access to a folder. As with everything else in Linux there are command line tools and the graphical user interface so we shall discuss both.

chown --helpThe Chown Utility

This is a command line tool that deals with the ownership of a file or folder. Open up a terminal and switch to root. Navigate to the directory which contains the file / folder you want to change and type:

chown [username][file /folder]

So for example if I wanted to change the owner of a file called tools to natasha and it was located in /home/chris I would type:

cd /home/chris

chown natasha tools

To check who owns a particular file / folder you can navigate to the directory that contains the file / folder and type:

ls -l

The Chmod Utility

Next up is the chmod utility which deals with permissions themselves. Open up a terminal and switch to root. Navigate to the directory which contains the file / folder you want to change and type:

chmod [777][file / folder]

Lets first explain the numbering system above. There are three types of permissions in Linux – Read, Write and Execute which are given values of 4, 2 and 1 respectively. So in the syntax above the file would be given Read (4), Write (2) and Execute (1) permissions (4+2+1 = 7). But don’t you give permissions to people and not files or folders? Correct, that is why there are three numbers which represent the owner, group and others. Lets take an example to illustrate the point. Say I wanted to change the permissions of a file called tools.doc to owner (rwe), group (rw) and others (r) and it was located in /home/chris I would type:

cd /home/chris

chmod 764 tools.doc

This gives the owner (rwe = 7) group (rw = 6) and others (r=4) different levels of access to the file.

Graphical Means of Changing Permissions and Ownership

For people who don’t want to use the command line there is another way to do all this. I shall illustrate this using Linux Mint 9. Locate the file you want to alter by using your file manager. Right click and go to open as root. In Linux Mint 9 the background will go red when a file is open as root. Right click and go to properties. On the properties page you will be given the option of changing permissions for the owner, group and others along with changing the owner of the file. Change accordingly.

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Best Beginners Linux Commands

By Dennis Frank Parker

There are many common Linux commands that will be to your benefit, if you ever even use your command line software in Linux. Many average users just use the graphical user interface instead which usually provides many tools and front-ends to Linux common commands. This Linux system tutorial on control commands will help the average user in the event X server accidents, fails, is not properly designed, etc. So stay with me for some of the more prevalent Linux bash instructions.

Some of the more Best free Linux tutorials. A Linux system Unix shell commands tend to be listed below for more information on each command you can always manage man [command] and this will bring up the manage for that command, you can also click on the requires listed for some frequent examples and format.

First before I list them virtually any syntax in [] will be needing some kind of input of your stuff normally, for example:

guy [command] you will want to actually change [command] with the shell order you want to read the guy page for: gentleman ls will give you the man page for the Linux covering command ls.

    • linux ls command – is used to list files on the filesystem.

 

    • File – command that will check the filetype, this will output to you what the file type is no matter what the extension is.

 

    • Mkdir command – used to make directories on the filesystem.

 

    • cd- is used for changing into a different directory in the Linux shell

 

    • cp – is the Linux copy command, this shell command is used to copy files|directories from one location on the filesystem to another.

 

    • Mv – the Linux terminal command to move files|directories. Like the cp command, but deletes the original source.

 

    • rm- shell command in Linux to remove files|directories.

 

    • Linux cat command- this command is used to print|view the contents of a file to the screen|terminal.

 

    • Grep – command used to search|find contents of a file and print|view on your terminal|screen.

 

    • Linux more and less – commands that will allow you to read output of files, unlike cat that will output the entire file at once, even if it is too large for your terminal more and less will output only as many lines as the shell you are in can output, and allow you to scroll through the file contents.

 

    • Chown – Linux command to change ownership of a file|directory.

 

    • Linux chmod – command that allows you to change mode of user access|permissions, basically set read, write, and execute permissions.

 

    • Linux ps – lists the current running processes on your Linux system

 

  • Linux kill and killall commands – used to kill|terminate running processes

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