The cat command in Linux is primarily used for concatenating and displaying the content of files. Here are some common uses of the cat command:
Basic Usage:
Display File Content:
cat filename
This command displays the content of the specified file on
the terminal.
Display Multiple Files:
cat file1 file2
Concatenate Files:
cat file1 file2 > outputfile
This command concatenates the content of file1 and file2 and
writes the result to outputfile.
Special Output Redirections:
Append to a File:
cat file1 >> file2
This appends the content of file1 to the end of file2.
Display Line Numbers:
cat -n filename
This displays the content of the file with line numbers.
Display Non-Printable Characters:
cat -v filename
This displays non-printable characters and tabs as ^I.
Display End of Line (Dollar Sign):
cat -e filename
This displays a dollar sign at the end of each line.
Combining with Other Commands:
Pipe Output to Another Command:cat filename | grep
pattern
This pipes the content of filename to grep for pattern
matching.
Creating and Displaying Files:
Create a New File:
cat > filename
This allows you to type into the terminal, and Ctrl+D ends
input. Useful for creating small text files.
Display Multiple Files in a Single View:
cat file1 file2
This displays the content of multiple files sequentially.
Displaying Binary Files:
Display Binary File Content:
cat -b binaryfile
This displays the content of a binary file.
Display Tabs as ^I:
cat -T filename
Display Contents with More:
cat filename | more
This command displays the content of the file one screen at
a time using the more command.
Display Contents with Less:
cat filename | less
Help:
Display cat Command Help:
cat --help
Display cat Version:
cat --version
hese examples cover a range of common use cases for the cat command in Linux. Adjust these commands based on your specific needs. Keep in mind that for more complex file manipulations, other tools like awk or text editors might be more suitable.
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