Terminal Pager
The terminal pager has been mentioned often in my reading about software engineering / computer science, so I figure I will try to learn more about it.
Date Created:
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A terminal pager, paging program, or simply pager is a computer program used to view (but not modify) the contents of a text file moving down the file one line or one screen at a time. Some, but not all, pagers move forwards and backwards in text files but cannot move backwards in pipes. less is a more advanced pager that allows movement forward and backward, and conations extra functions such as search.Examples
more- Command to view (but not modify) the contents of a text file one screen at a time, available in Unix and Unix-like systems.
$ more [options] [file_name]
- If no file name is provided,
morelooks for input from standard input. - In the lower-left corner of the screen is displayed the text
--More--
and a percentage, representing the percent of the file thatmorehas paged through. - When
morereaches the end of a file, it exits. - The most common methods of navigating through a file are Enter, which advances the output by one line, and SPACE, which advances the output by one screen.
- Options
--num- option specifies an integer which is the screen size in lines-d-causes the program to prompt the user with a message instead of ringing the bell when an illegal key is pressed-f-causes the program to count logical rather than screen lines-p-do not scroll, clear the screen and display the text-c-do not scroll. paint each screen from the top, clearing the remainder of each line as it is displayed-s-squeeze multiple blank lines into one-u- backspace and carriage return are treated as printable characters+/-specifies a string that will be searched before each file is displayed+num- start at line numbernum
- If no file name is provided,
less- Similar to
more, but allows for backwards navigation.
- Similar to
$ less [options] [file_name]...
pg- Was a terminal pager for text files, but it has been removed.
most- similar to
lessin capabilities
- similar to
nano --view- text editor for Unix-like computing systems or operating environments using a command line interface
emacs -nw -e "(view-mode)"- family of text editors that are characterized by their extensibility
w3m- free and open source text-based web browser licensed under the MIT license.
- It differs form other text based browsers by supporting elements such as tables, frames, and images.
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