Linux Commands: Tail, Find, Iname, Force, Dir, Filename

Using POSIX Commands in Linux

Linux has a large, dedicated community that is always willing to provide assistance to other users. The Linux operating system can perform a number of tasks and is highly scalable.

Linux has a command-line interface that allows users to navigate its files and folders. In this article, we will explore the tail command and its real-life applications.

-type f

Linux offers powerful tools for searching for files based on their name, type, size and modification time. The find command is one of those tools. It is capable of locating not only files but also directories, device files and named pipes. However, if you use the -type f option, find will return only regular files and not other types of data such as directories or devices.

In this example, the find command searches for a file called Chapter1. The -size +100M option limits the search to files that are larger than 100 megabytes.

-type l

The -type l option displays the file type in the first field of the file mode string for each item in the directory listing. The rest of the string specifies the permissions for the item. POSIX defines seven standard file types: regular files, directories, symbolic links, FIFO special files, character device files, block devices and sockets.

The first character of the file type can be a -, d or l. d indicates a directory, l indicates a symbolic link and c indicates a character device file (these provide serial streams of input and output). For example, a Linux terminal is a classic character device file.


Linux is a powerful operating system that has one of the largest collections of flags available. These flags can help you customize your machine’s settings or perform a variety of tasks. Some of these commands aren’t installed d by default, but you can easily install them with the package manager.

The find command allows you to search for files by name, size and other properties. Using the -type f option ensures that the search is only for regular files, not directories or other types of file. The -size options allow you to specify the size in bytes (c), kilobytes (k), megabytes (M) or gigabytes (G). It also lets you search for files modified within a certain time frame.


The -iname command in Linux allows you to search files while ignoring text case. This can be useful for filtering out specific words, such as a or c. The command is also useful for displaying the last line of a file.

The find command in Linux is a powerful tool that lets you search for files, directories, and character or block devices. The command can be used in a variety of scenarios, including GUI-less environments. It can also be used to search for a manual page name. It will return a list of all manual pages that match the specified name.


In many cases, the -f option allows you to bypass protections that prevent a command from executing. This can include a device being in use or a file already existing. However, you should always be careful when using the -f option as it can have a negative impact on your system.

The tail command uses the -f option to display the last 10 lines of a file. It also shows you when the file is updated by another process. Many other commands use the -f option to do the same thing.


The dir command displays a list of the items in a directory, including their permissions. The first character in a line indicates whether the item is a file or a directory, while the next three characters give a summary of its permissions.

The next column shows the owner of a file or directory, and the Unix group to which it belongs. The final column shows other level permissions for the file or directory.

The -R option of the dir command gives a recursive listing of all files beneath the current directory. The output is usually color coded, with plain entries indicating data files, blue entries displaying directories and green indicating executables.


The file command displays information about files on your Linux system. It can determine the type of file, size, and more. It can also display the data inside compressed files. It can even be used to track processes that are using the file.

The -f option specifies the type of file you want to find. It can be a regular file, a directory, or even a device file. You can also use a wildcard to search for multiple types of files.

The -perm option filters the files based on their permissions. You can specify permissions in terms of user, group, or others.

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