Du command vs Df command in Ubuntu

du command in Ubuntu

The du command is a Ubuntu utility that estimates the space used by a file or directory and displays the sizes in a human-readable format. Here are some common options you can use with du:

• -a or –all: show sizes of directories and files, including hidden files
• -b or –bytes: display sizes in bytes
• -c or –total: display a grand total of all the file sizes
• -h or –human-readable: display sizes in a human-readable format (e.g., 1K 234M 2G)
• -s or –summarize: display only a total for each argument
• –exclude=PATTERN: exclude files and directories that match the PATTERN specified
• –exclude-from=FILE: exclude patterns listed in the specified FILE

Here are some examples of how you can use du:

To show the size of a file in human-readable format:

du -h filename

To show the sizes of all files and sub-directories in the current directory, including hidden files:

du -a

To display the sizes of all files and directories in the /var directory in human-readable format:

du -sh /var

To display the sizes of all files and directories in the current directory, excluding files and directories that match the pattern *.tmp:

du -a --exclude='*.tmp'

df command in Ubuntu

The df command is a Ubuntu utility that displays information about the available and used disk space on a file system. Here are some common options you can use with df:

• -a or –all: include pseudo, duplicate, and inaccessible file systems
• -B or –block-size=SIZE: use SIZE-byte blocks
• -h or –human-readable: display sizes in a human-readable format (e.g., 1K 234M 2G)
• -H or –si: like -h, but use powers of 1000 not 1024
• -i or –inodes: display inode information
• -k or –kilobytes: display sizes in kilobytes
• -l or –local: limit the output to local file systems
• -T or –print-type: display the file system type
• Here are some examples of how you can use df:

To display information about all mounted file systems:

df -h

To display information about the file system that contains the current directory, in human-readable format:

df -h .

what is the difference between du and df command ?

The du command is used to estimate the space used by a file or directory, while the df command is used to display information about the available and used disk space on a file system.

One key difference between these two commands is the level of granularity at which they operate. du examines individual files and directories and displays the sizes of each, while df provides an overview of the entire file system or a specific mounted file system.

I hope this helps clarify the difference between these two commands. Let me know if you have any questions.