Linux中如何添加文件执行权限（linux加执行权限）
The Linux operating system has the ability for users to add execution permissions to files. This is especially important for scripts, program executables, and other type of files, as these may need execute permissions for proper functioning. This brief tutorial explains how to set up execution permissions for files in Linux systems.
Before granting execute permissions to a file, it is important to know how this works in Linux. By default, files are treated as one of three distinct types: Regular files, directories, or symbolic links. In order to grant execute permission to a file, it must be a regular file (not a directory or a link). Also, user should be aware that the execute permission is set in the form of three bits, and can be set also for the owner (the user that owns the file), the group, or all users (also known as “others”).
To set an execute permission bit for a file, user can use the chmod command in the following way:
chmod +x filename
If user wants to set the execute permission bit for the group or others, it can be done by adding a “g” or “o” switch to the command, respectively.
chmod g+x filename
chmod o+x filename
If user needs to add execution permissions to every file in a directory (and all subdirectories if recursive is used), user can use the find command in combination with the chmod command, as shown:
find ./directory -type f -exec chmod +x {} \;
Above command adds execute permission to all files located in my_directory directory and all its subdirectories.
For other types of permissions, user can also use the chmod command. To make the file only writable by its owner, user can use the following command:
chmod u=rw filename
To make a file executable, readable and writable only by its owner (and no one else):
chmod u=rwx filename
In fact, there are many other variations of the chmod command. To see the full syntax, user can type man chmod, or look up different tutorials on the web.
Setting execute permissions for files in Linux can be very useful for enabling users to run programs and scripts. Remember that the execute permission bit must be set for regular files, not directories or links. Using the chmod command and its switches, user can add execute permissions to files, as well as other types of permissions such as read, write or execute.
