What does the permission 0750 on a file mean?
You'd use chmod like this to set no special permissions: chmod 0750 myscript.sh . Sticky bit A value of 1. This bit is commonly set to directories and means that you may only remove file in such a directory that are owned by you. If this permission is given, the program is executed as the Owner of the file.
where nnn is the 3-digit number representing the permissions, and filename is the file you want to change. For example: chmod 755 formmail.cgi. will assign read, write and execute permission to the owner, and just read and execute permission to everyone else, on the script called formmail.cgi .
- 644 means that files are readable and writeable by the owner of the file and readable by users in the group owner of that file and readable by everyone else. 755 is the same thing, it just has the execute bit set for everyone. The execute bit is needed to be able to change into the directory.
- The chown Command. The chown command is used to change the owner and group of files, directories and links. new_owner is the user name or the numeric user ID (UID) of the new owner, and object is the name of the target file, directory or link. The ownership of any number of objects can be changed simultaneously.
- chmod. The chmod command is used to change the permissions of a file or directory. To use it, you specify the desired permission settings and the file or files that you wish to modify.
When you perform the chmod 755 filename command you allow everyone to read and execute the file, and the file owner is allowed to write to the file as well. You may need this for Perl and other scripts that should to be run via a webserver.
- Open-source intelligence (OSINT) is data collected from publicly available sources to be used in an intelligence context. In the intelligence community, the term "open" refers to overt, publicly available sources (as opposed to covert or clandestine sources).
- Imagery intelligence (IMINT) is an intelligence gathering discipline which collects information via satellite and aerial photography. As a means of collecting intelligence, IMINT is a subset of intelligence collection management, which, in turn, is a subset of intelligence cycle management.
- Measurement and signature intelligence (MASINT) is a technical branch of intelligence gathering, which serves to detect, track, identify or describe the signatures (distinctive characteristics) of fixed or dynamic target sources.
On Linux and other Unix-like operating systems, there is a set of rules for each file which defines who can access that file, and how they can access it. These rules are called file permissions or file modes. The command name chmod stands for "change mode", and it is used to define the way a file can be accessed.
- SGID (Set Group ID up on execution) is a special type of file permissions given to a file/folder. Normally in Linux/Unix when a program runs, it inherits access permissions from the logged in user.
- The GPT GUIDs (Globally unique identifiers) and our familiar Linux UUIDs (Universally Unique Identifiers) are not the same thing, though they serve the same useful purpose: giving block devices unique names. Linux UUIDs are a function of filesystems, and are created when the filesystem is created.
- Setuid, which stands for set user ID on execution, is a special type of file permission in Unix and Unix-like operating systems such as Linux and BSD. It is a security tool that permits users to run certain programs with escalated privileges.
Updated: 2nd October 2019