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CHAPTER 2 GETTING THE MOST FROM THE COMMAND LINE
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The last file management task discussed in this section is the option to create empty files, which can be very useful for testing purposes when you need a file to exist but without necessarily having any contents. The touch command will do just that. For example, touch somefile will create a zero-byte file with the name somefile in the current directory. You should be aware that it was never the purpose of touch to create empty files. The main purpose of the command is to open a file so that the last access date and time of the file that are displayed with ls are modified to the current time. For example, touch * will set this time stamp to the present date and time on all files in the current directory. If, however, touch is used with the name of a file that doesn t exist as its argument, it will create this file as an empty file.
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Piping and redirection are some of the most powerful features of the Linux command line. Piping sends the result of a command to another command, and redirection sends the output of a command to a file. You can also use redirection to send the contents of a file to a command. The file doesn t have to be a regular file; for example, it can be a device file. So you can send output directly to a device, as you will see in the following examples.
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Note Every device present on your server is represented by a device file. One of the cool things of Linux
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is that you can talk to these device files directly. Try the command cat /dev/sda, for example. It will show you the binary contents of your server s hard drive. Pretty cool, isn t it You may want to use Ctrl+C to get out of this stream of data; you can also use the reset command to get the normal appearance of your terminal back.
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The goal of piping is to execute one command and send its output to a second command so that the second command can do something with it. For instance, a common scenario is when the output of a command doesn t fit on the screen, in which case the command can be piped to less, thus allowing you to browse the output of the first command screen by screen. This is useful when working with ls -lR, which normally displays a list of files with all properties as well as all subdirectories of the current directory. To view the output of this command screen by screen, you can use ls -lR | less to send the output from the first command (ls -lR) to the second command (less). Another very useful command that can be used in a pipe construction is grep. You ve already seen grep as a way of searching files for a given string, but it can also be used to filter information. This technique is often used to find out whether a given process is running or to check that a certain network port is offered by your server. For example, the command sudo ps aux | grep http will show you all lines in the output of the command ps aux (which produces a list of all processes active at your server) that contain the text http . Another example is sudo netstat -tulpen | grep 22, in which the output of netstat -tulpen (which produces
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CHAPTER 2 GETTING THE MOST FROM THE COMMAND LINE
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a list of all processes that are offering network connections on your server) is examined for the occurrence of the number 22 (the SSH port). You can see what this looks like in Listing 2-9. Listing 2-9. Filtering Command Output by Piping to grep sander@RNA:~$ sudo netstat -tulpen | grep 22 tcp6 0 0 :::22 :::* LISTEN 0 15332 4321/sshd
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