What is du command in Linux?

What is du command in Linux? The du command is a standard Linux/Unix command that allows a user to gain disk usage information quickly. It is best applied to specific directories and allows many variations for customizing the output to meet your needs.

Why df and du show different results? du shows the blocks actually allocated to an individual file. df shows the blocks allocated in the entire file system, including inodes and other meta data.

What is df in command line? The df command (short for disk free) is used to show the amount of free disk space available on Linux and other Unix-like systems and to understand the filesystems that have been mounted. df displays the amount of free space on the file system containing each file name argument.

What unit is du in Linux? du computes file space in units of 512 bytes. The actual disk space used by files and directories may be more, since some systems allocate space in units of some multiple of a sector. On UNIX System V, it is usually two sectors; on UNIX Version 7, it is one sector. The allocation unit is file system specific.

What is du command in Linux? – Additional Questions

How du works in Linux?

The Linux “du” (Disk Usage) is a standard Unix/Linux command, used to check the information of disk usage of files and directories on a machine. The du command has many parameter options that can be used to get the results in many formats.

Is bytes du command?

du measures file space in 512-byte units.

How do you use the du command?

To utilize the basic usage of the du command, simply open a terminal window, type du, and hit Enter. The output displays each directory’s disk usage and path, along with the total disk usage of the parent directory.

How do I check disk space in Linux?

That command is df -H. The -H switch is for human-readable format. The output of df -H will report how much space is used, available, percentage used, and the mount point of every disk attached to your system (Figure 1).

How do you sort by size in du command?

Using the du and sort Commands

We can use du and sort commands to list and sort files according to their size: $ du -ah –max-depth=1 | sort -h 451M ./dir2 751M ./dir1 1.2G ./file4.

How do I find calendar in Linux?

If a user wants a quick view of the calendar in the Linux terminal, cal is the command for you. By default, the cal command shows the current month calendar as output. cal command is a calendar command in Linux which is used to see the calendar of a specific month or a whole year.

What is host name in Linux?

hostname command in Linux is used to obtain the DNS(Domain Name System) name and set the system’s hostname or NIS(Network Information System) domain name. A hostname is a name which is given to a computer and it attached to the network. Its main purpose is to uniquely identify over a network.

How do I view calendar in Unix?

How to show a calendar in the terminal. To show a calendar in the terminal simply run the cal command. This will output a calendar of the current month with the current day highlighted.

What is grep in shell script?

Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. The text search pattern is called a regular expression. When it finds a match, it prints the line with the result. The grep command is handy when searching through large log files.

What is in awk?

Awk is a utility that enables a programmer to write tiny but effective programs in the form of statements that define text patterns that are to be searched for in each line of a document and the action that is to be taken when a match is found within a line. Awk is mostly used for pattern scanning and processing.

How do I exit grep?

End it by closing your quote (i.e. typing another apostrophe). Or, if you’ve changed your mind and you don’t want to execute the command any more, ctrl c will get you out of the command and back into the shell.

How do I grep a log?

For searching files, the command syntax you use is grep [options] [pattern] [file] , where “pattern” is what you want to search for. For example, to search for the word “error” in the log file, you would enter grep ‘error’ junglediskserver. log , and all lines that contain”error” will output to the screen.

How do I grep all files in a directory?

You can make grep search in all the files and all the subdirectories of the current directory using the -r recursive search option: grep -r search_term .

How do I view a log file?

You can read a LOG file with any text editor, like Windows Notepad. You might be able to open one in your web browser, too. Just drag it directly into the browser window, or use the Ctrl+O keyboard shortcut to open a dialog box to browse for the file.

What does grep return?

The grep command searches a text file based on a series of options and search string and returns the lines of the text file which contain the matching search string.

What is gawk Unix?

gawk is the GNU implementation of the Awk programming language, first developed for the UNIX operating system in the 1970s. The Awk programming language specializes in dealing with data formatting in text files, particularly text data organized in columns.

What does * do with grep?

Searching for Metacharacters
Character Matches
[^] Any character not in the list or range
* Zero or more occurrences of the preceding character or regular expression
.* Zero or more occurrences of any single character
The escape of special meaning of next character