Shulou(Shulou.com)06/02 Report--

The cat command is originally used to connect the contents of multiple files, but it is more often used to view the contents of files in practice, and it is often used in conjunction with redirection.

1. Command format:

Cat [options] [File]

two。 Command function:

Cat has three main functions.

1. Display the entire file at once

two。 Create a file from the keyboard

3. Merge several files into one file

3. Common command parameters

-A, all

-b, for non-empty outgoing line number

-n, numbering all lines of output, starting with 1, numbering the lines of all output

-s, if there are more than two blank lines in a row, replace it with a blank line

4. Use an example

Example 1: view / opt/test1.txt

Command: cat / opt/test1.txt

Example 2: create a file test2.txt (in the / opt directory) with cat, and the content is: my name is cat command: cat > test2.txt.

Example 3: view both test1.txt file and test2.txt file command cat / opt/test1.txt / opt/test2.txt

Example 4: merge the contents of test1 and test2 files into a new file test3

Command: cat / opt/test1.txt / opt/test2.txt > test3

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