The (very complicated) answer can be best summarized like this: The df command provides a sweeping ballpark figure for how much space is being utilized on your filesystem as a whole. The du command is a much more accurate snapshot of a given directory or subdirectory.
In the same way Why is df faster than du?
Working wise, df Looks at disk used blocks directly in filesystem metadata. Because of this it returns much faster than du but can only show info about the entire disk/partition. Where as, du walks through directory tree and counts the sum size of all files therein.
Subsequently, What ls command in Linux? The Linux ls command allows you to view a list of the files and folders in a given directory. You can also use this command to display details of a file, such as the owner of the file and the permissions assigned to the file.
What top command shows Linux?
The top command is used to show the active Linux processes. It provides a dynamic real-time view of the running system. Usually, this command shows the summary information of the system and the list of processes or threads which are currently managed by the Linux kernel.
What does inode stand for?
The inode (index node) is a data structure in a Unix-style file system that describes a file-system object such as a file or a directory. Each inode stores the attributes and disk block locations of the object’s data.
What does MV do in Linux?
Use the mv command to move files and directories from one directory to another or to rename a file or directory. If you move a file or directory to a new directory without specifying a new name, it retains its original name.
What does CP do in Linux?
The Linux cp command is used for copying files and directories to another location. To copy a file, specify “cp” followed by the name of a file to copy.
Is Al command in Linux?
The Linux ls command is used to list files and directories. … The next column shows the group that owns this file (in this case the group named “al”). The next columns is the size of the file (or directory entry), in bytes. The date field shows the last modification time of the file or directory.
What is the nice value in Linux?
The Linux niceness scale goes from -20 to 19. The lower the number the more priority that task gets. If the niceness value is high number like 19 the task will be set to the lowest priority and the CPU will process it whenever it gets a chance. The default nice value is zero.
What is MEM in top command?
If you want to make top a bit more memory-friendly, issue the command top -o %MEM, which will cause top to sort all processes by memory used (Figure 2). … The top command also gives you a real-time update on how much of your swap space is being used.
What is the difference between top and ps command in Linux?
top is mostly used interactively (try reading man page or pressing “h” while top is running) and ps is designed for non-interactive use (scripts, extracting some information with shell pipelines etc.) top allows you display of process statistics continuously until stopped vs. ps which gives you a single snapshot.
What is the use of i node and superblock?
An Inode is a data structure on a Unix / Linux file system. An inode stores meta data about a regular file, directory, or other file system object. Inode acts as a interface between files and data. … The superblock is the container for high-level metadata about a file system.
What is the role of kernel?
The kernel is a computer program at the core of a computer’s operating system and has complete control over everything in the system. … The kernel performs its tasks, such as running processes, managing hardware devices such as the hard disk, and handling interrupts, in this protected kernel space.
What is inode table in OS?
An inode is a data structure in UNIX operating systems that contains important information pertaining to files within a file system. When a file system is created in UNIX, a set amount of inodes is created, as well. Usually, about 1 percent of the total file system disk space is allocated to the inode table.
Can mv create directory?
If mv fails (dir does not exist), it will make the directory (which is the last argument to the previous command, so $_ has it). So just run this command, then up to re-run it, and this time mv should succeed.
Can mv move a directory?
The mv command moves files and directories from one directory to another, or renames a file or directory. If you move a file or directory to a new directory, it retains the base file name. … You can use the mv command to move files within the same file system or between file systems.
What command is mv?
What is the mv command in UNIX? The mv command is a command line utility that moves files or directories from one place to another . It supports moving single files, multiple files and directories. It can prompt before overwriting and has an option to only move files that are new than the destination.
What is Sudo do?
Sudo stands for either “substitute user do” or “super user do” and it allows you to elevate your current user account to have root privileges temporarily. This is different from “su” which is not temporary.
Who command in Linux?
The Linux “who” command lets you display the users currently logged in to your UNIX or Linux operating system. Whenever a user needs to know about how many users are using or are logged-in into a particular Linux-based operating system, he/she can use the “who” command to get that information.
How do I cp a directory?
In order to copy a directory on Linux, you have to execute the “cp” command with the “-R” option for recursive and specify the source and destination directories to be copied. As an example, let’s say that you want to copy the “/etc” directory into a backup folder named “/etc_backup”.
Why we use ls command?
The ls command is used to list files. “ls” on its own lists all files in the current directory except for hidden files. … ls -a will list all files including hidden files (files with names beginning with a dot).
What is bash console?
Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. First released in 1989, it has been used as the default login shell for most Linux distributions. … Bash can also read and execute commands from a file, called a shell script.
What is output of ls?
The output from ls -l summarizes the most important information about the file on a single line. If the specified pathname is a directory, ls displays information about every file in that directory (one file per line).
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