tail in some way, we have
cat can also add content to a file, and this makes it super powerful.
In its simplest usage,
cat prints a file’s content to the standard output:
You can print the content of multiple files:
cat file1 file2
and using the output redirection operator
> you can concatenate the content of multiple files into a new file:
cat file1 file2 > file3
>> you can append the content of multiple files into a new file, creating it if it does not exist:
cat file1 file2 >> file3
When watching source code files it’s great to see the line numbers, and you can have
cat print them using the
cat -n file1
You can only add a number to non-blank lines using
-b, or you can also remove all the multiple empty lines using
cat is often used in combination with the pipe operator
| to feed a file content as input to another command:
cat file1 | anothercommand.
This command works on Linux, macOS, WSL, and anywhere you have a UNIX environment
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