File Operation Commands in Linux

File Operation Commands in Linux are used to manage files within the filesystem, including creating, viewing, copying, moving, and deleting files. These commands help users efficiently organize and control file data through the terminal.

• Used to create, view, copy, move, rename, and delete files.
• Helps manage file content, size, and structure.
• Supports file searching, comparison, and sorting operations.
• Essential for daily file management and system administration tasks.

List of File Operation Commands

Below is a list of file operation commands that help in understanding how files are managed and manipulated in Linux.

1. basename

The basename command extracts the file name from a full file path. It removes directory information and displays only the file name.

• Removes directory path
• Useful in shell scripting
• Works with file paths

Example:

basename /home/user/file.txt

Output:

2. cat

The cat command displays the contents of a file on the terminal. It can also be used to concatenate multiple files.

• Displays file content
• Combines multiple files
• Creates files using redirection

Example:

cat file.txt

Output:

3. cksum

The cksum command generates a checksum and file size. It helps verify file integrity during transfers.

• Displays CRC checksum
• Shows file size
• Used for integrity checks

Example:

cksum file.txt

Output:

4. cmp

The cmp command compares two files byte by byte. It reports the first difference between files.

• Byte-level comparison
• Checks file equality
• Silent if files are same

Example:

cmp file1.txt file2.txt

5. compress

The compress command reduces file size using compression. It creates files with a .Z extension.

• Reduces storage space
• Creates .Z files
• Older compression method

Example:

compress example.txt

Output:

6. cp

The cp command copies files or directories from one location to another. It is commonly used for backups.

• Copies files
• Copies directories with -r
• Preserves permissions with options

Example:

cp file1.txt file2.txt

Output:

7. cpio

The cpio command creates and extracts archive files. It is often used with pipes for backups.

• Archive creation
• Backup utility
• Works with standard input

Example:

ls | cpio -o > backup.cpio

Output:

8. csplit

The csplit command splits a file into multiple smaller files. It works based on patterns or line numbers.

• Splits large files
• Pattern-based splitting
• Useful for logs

Example:

csplit file.txt /pattern/

Output:

9. cut

The cut command extracts specific columns or fields from a file. It is mainly used with delimited text files.

• Extracts columns
• Works with delimiters
• Useful for CSV/text files

Example:

cut -d: " " -f 2,3 sample.txt

Output:

10. diff

The diff command compares files line by line. It shows the differences between two files.

• Line-by-line comparison
• Shows changes clearly
• Used in version control

Example:

diff a.txt b.txt

Output:

11. diff3

The diff3 command compares three files simultaneously. It is mainly used for resolving merge conflicts.

• Three-file comparison
• Merge conflict detection
• Developer-friendly

Example:

diff3 a.txt b.txt c.txt

Output:

12. echo

The echo command prints text or variables to the terminal. It is widely used in shell scripts.

• Displays text
• Prints variables
• Supports redirection

Example:

echo "Hello Linux"

Output:

13. expand

The expand command converts tabs into spaces. It improves text formatting.

• Tab-to-space conversion
• Improves readability
• Text formatting tool

Example:

expand file.txt

Output:

14. file

The file command identifies the type of a file. It does not rely on file extensions.

• Detects file type
• Shows MIME type
• Useful for unknown files

Example:

file script.sh

Output:

15. fold

The fold command wraps long lines to a specified width. It improves text display.

• Line wrapping
• Adjustable width
• Formatting tool

Example:

fold -w60 GFG.txt

Output:

16. head

The head command displays the first lines of a file. By default, it shows the first 10 lines.

• Displays file start
• Custom line count
• Useful for logs

Example:

head sample.txt

Output:

17. less

The less command displays file content page by page. It allows forward and backward navigation.

• Page-wise viewing
• Scroll support
• Faster than more

Example:

less file.txt

Output:

18. join

The join command merges two files using a common field. Files must be sorted before joining.

• File merging
• Common-field based
• Database-style join

Example:

join file1.txt file2.txt

Output:

19. ln

The ln command creates links between files. It supports both hard and symbolic links.

• Creates shortcuts
• Hard and soft links
• File linking

Example:

ln -s file.txt link.txt

Output:

20. locate

The locate command searches files using a database. It provides faster results than find.

• Fast searching
• Database-based
• Requires updated database

Example:

locate file.txt

Output:

21. look

The look command displays lines starting with a given string. It works on sorted files.

• Prefix search
• Dictionary lookup
• Case-sensitive

Example:

look "#include" Assignment.c

Output:

22. more

The more command displays text one screen at a time. It is a basic file viewer.

• Page-wise display
• Simple navigation
• Older than less

Example:

more sample.txt

Output:

23. mv

The mv command moves or renames files and directories. It performs both actions using the same command.

• Renames files
• Moves files
• Overwrites existing files

Example:

mv old.txt new.txt

Output:

24. od

The od command displays file content in octal or other formats. It is useful for inspecting binary files.

• Binary display
• Debugging tool
• Multiple formats

Example:

od file.txt

Output:

25. paste

The paste command merges files line by line horizontally. It combines corresponding lines.

• Horizontal merge
• Line-by-line output
• Text processing tool

Example:

paste a.txt b.txt

Output:

26. readlink

The readlink command displays the target of a symbolic link. It resolves symlink paths.

• Resolves links
• Shows actual path
• Symlink utility

Example:

readlink link.txt

Output:

27. rename

The rename command renames files using patterns. It is useful for bulk renaming.

• Batch renaming
• Pattern-based
• Time-saving

Example:

rename 's//.log/' *.txt

Output:

28. rev

The rev command reverses characters in each line. It is a text manipulation utility.

• Line reversal
• Character-based
• Text processing

Example:

rev file.txt

Output:

29. rm

The rm command deletes files permanently. Deleted files cannot be recovered easily.

• Deletes files
• Recursive delete
• Dangerous command

Example:

rm file.txt

Output:

30. shred

The shred command overwrites files multiple times. It prevents data recovery.

• Secure deletion
• Overwrites data
• Security tool

Example:

shred demo.txt

Output:

31. sort

The sort command sorts lines in a file. It supports alphabetical and numeric sorting.

• Alphabetical sorting
• Numeric sorting
• Text organization

Example:

sort file.txt

Output:

32. split

The split command divides large files into smaller ones. It is size or line based.

• File splitting
• Size-based control
• Useful for large files

Example:

split demo.txt part_

Output:

33. tac

The tac command displays file content in reverse order. It prints lines from bottom to top.

• Reverse display
• Opposite of cat
• Log analysis

Example:

tac tacxample.txt

Output:

34. tail

The tail command shows the last lines of a file. It is widely used for log monitoring.

• Displays file end
• Live monitoring
• Adjustable line count

Example:

tail file.txt

Output:

35. tar

The tar command creates and extracts archive files. It is commonly used for backups.

• Archive creation
• File extraction
• Backup utility

Example:

tar -cvf archivedemo.tar demo.txt folder1/

Output:

36. tee

The tee command writes output to both file and terminal. It is commonly used with pipes.

• Dual output
• Logging support
• Pipe-friendly

Example:

echo "Hello World" | tee demo.txt

Output:

37. touch

The touch command creates empty files or updates timestamps. It is the fastest way to create a file.

• Empty file creation
• Timestamp update
• File management

Example:

touch test.txt

Output:

38. unexpand

The unexpand command converts spaces into tabs. It is the reverse of expand.

• Space-to-tab conversion
• Formatting utility
• Text cleanup

Example:

unexpand file.txt

Output:

39. uniq

The uniq command removes duplicate lines from a file. It works best on sorted files.

• Removes duplicates
• Line comparison
• Text processing

Example:

uniq file.txt

Output:

40. wc

The wc command counts lines, words, and characters. It is useful for text analysis.

• Line count
• Word count
• Character count

Example: wc file.txt

Output: