table of Contents
- chmod
- head
- more
- less
chmod command
Permission for the change of command in linux
Remember: r = 4 w = 2 x = 1
Rights generally -rwxr-x - x in the form of a total of 13 characters, of which the foremost - we do not understand the principle (understanding of the principles, please pass), rwx user belongs to the first group representation file is readable (r ), write (w), executable (x), respectively, is an abbreviation of the word. rx second group, belonging to the same group is represented as user permissions readable (R & lt), not write (-), executable (X), the third group the same logic, but the object has changed, permission for other users unreadable (-), and write (-), executable (x).
Then we look at the permissions of a file when it is to see an array of rwx each group consisting of, here's -rwxr-x - x its permissions is 751.
The results after revision
head command
N the first line of a file to view
Format: head -n filename
more command
Page by page displays the contents of the file
Syntax: more filename
Methods: space (space): on behalf of a downward turn
Enter: the representative of his party turned down
/ String that represents the content displayed in them, down search "string"
-f: immediately shows the file name and line number currently displayed
q: represents a leaving more immediately, does not display the contents of the file
less command
less command is often used because the pages can be turned and look for the actual situation in the discovery process, very convenient
Usage: less log file name ---- page displays the contents of the file
Spaces or F Down
enter key wrap
q quit
pgup / pgdn Previous / Next Change
A direction key / next row switch
Specified search string: / find syntax similar character, and more inside. But here you can press the "n" continues to look down the other