Text File View commands: Cat, TAC, more, less, tail, head

Text File View commands: Cat, TAC, more, less, tail, head

Cat: Start all of the file contents from the first line

TAC: Displays the contents of all files from the last line

MORE: Page-by-page display of file contents

Less: page-by-page display of file content, but allows page forward

Tail: Show only a few lines at the end

Head: Show only the first few lines

The cat command is a concatenate (continuous) shorthand for displaying the contents of the entire file on the screen, so the cat command has a question

, that is, when the entire file content is more than the screen size, we can only see the last display on the screen content, before the display

The results are too late to see.

The TAC command is exactly the opposite of the cat command (as can be seen from the name), and the TAC command starts the file contents consecutively from the last line of the file.

displayed on the screen content.

CAT,TAC command

Syntax: [OPTIONS] ... FILE:

Common parameter Options

-A: Show all content

Example:

#cat-A/etc/passwd

More, less

Syntax: more [OPTIONS] ... FILE ...

Common parameter Options

-D: Display page with Exit prompt

Space: one screen backward;

Enter: one line backward;

B: one screen ahead;

Example:

# More-dc/etc/profile//Display prompt, and display from the terminal or the top of the console;

# more +4/etc/profile//starting from the 4th line of the profile display;

# more-4/etc/profile//Display 4 rows per screen;

Syntax: less [OPTION] ... FILE ...

Common parameter Options

Text Search:

/keyword

? KEYWORD

N: Next with the same direction as the command;

N: The previous one in the opposite direction of the command;

Example:

# less-n/etc/profile//Display line number

Tail,head: It's easier to use

Syntax: Head [OPTION] ... FILE

or tail [OPTION] ... FILE

Common parameter options:

-N #: Display before # line or after # line

Example:

# tail-n 5/etc/profile//Display the last 5 lines of the/etc/profile

# Head-n 5/etc/profile//Show front 5 lines of/etc/profile

-#

Time Stamp management tool: Touch

Syntax: Touch [options] ... File..

Common parameter options:

-A: or--time=atime or--time=access or--time=use only change the access time.

-D: Use the specified date time instead of the current time.

-M: or--time=mtime or--time=modify only change the change time.

-T: Use the specified date time instead of the current time.

Each file has three timestamps:

Atime: The last time the file was visited;

Mtime: The last time the file was "modified";

CTime: The time the file was last "changed";

This article is from the "10,000-hour Law" blog, be sure to keep this source http://daisywei.blog.51cto.com/7837970/1687816

Text File View commands: Cat, TAC, more, less, tail, head