Skip to main content

What is chmod

chmod is a command on UNIX systems. It is used to allow file permissions. Or folders About what someone can do Which is divided into 3 groups which are

1. The owner of the file (owner)
2. File owner group
3. General users, external (public)

Which can specify that each group can
1. Can read the file or download the file in that directory (read)
2. Write a file or create a file or directory in that directory (write)
3. The file can be processed (execute).

For example, if you want any directory Can create files into directories We have to give permission to the directory to write (or write) or if we want any files to be Can only read Set the file to read (read) and if you want the file to be rewritten or deleted Must grant rights to that file Can read (write)

owner group public
4 read read read
2 write write write
1 execute execute execute

a sample
1. chmod 666 is set to that file Read + Write (4 + 2)
2. chmod 777 is to specify that the file can do everything (4 + 2 + 1)
Labels:

Comments

Post a Comment

Popular posts from this blog

Changing AppServ Path Directory

Usually when we install AppServ on our machine Important instructions for installation are Use the given value in the program as the best, which will allow us to The directory that stores files on our device is "C:\AppServ\www" which, if we want to change this file store to another place Let us do as follows Go to Start Menu -> Programs -> AppServ -> Apache Configure Server -> Edit the Apache httpd.conf Configuration File. Clicking will open the file httpd.conf and edit it with NotePad. Let us use Replace to search and replace. "C:/AppServ/www" with the new directory name that we want. For example, "D:/www", every character is assigned to the new directory "D:\www" After that, save the file to the same name and then restart the Apache is complete. Now that we have a new directory that holds our files as "D:\www" as needed, let us put the index.php file into this directory. And then test by typing http://l
Post a Comment
Read more

How to Improve W3C Rule

In general, if it is HTML , it is not difficult to make a website via W3C . Using Dreamweaver, it is already passed. If not, there is still an error. But if it's a script, you're dizzy, so you have to sit and do it yourself line by line What I would say here is Things that I often encounter img does not have an alt and without/before the end of the tag, especially in the first case. If we don't know what to put alt, they can put a blank value <img src = "xxx.jpg" alt = "" /> The script does not have a type. For example, <script language = "JavaScript" src = "js / function.js" type = "text / javascript"> </script> style, also must have type <link rel = "stylesheet" href = "style / style.css" type = "text / css" /> Some of the properties of the tag, such as align bgcolor. They are no longer used. In truth Must remove it all. If there is an error as soon as I st
Post a Comment
Read more

Priorities Within the WHERE Statement of MySQL

Prioritization within the WHERE clause of MySQL has a profound effect on query performance, especially in the case of the database is large or complex queries, in which MySQL processes the SQL statements from left to right. The important principle of the priority of queries in this section is to specify the results that are ordered in ascending order from left query to right query. I give an example of the member database. Suppose there are 100 records in total. 50 men, 50 women and have a unique name. I want information that is male. SELECT * FROM user WHERE sex='m' I will get 50 records. If I need information called test. SELECT * FROM user WHERE username='test' I will get only one record (if any). The above command will execute a loop from the first record one by one and compare the data within the WHERE statement. Of course, it will need to process 100 cycles according to the amount of data. Suppose, if I want the data named test male, I ca
Post a Comment
Read more