Special permission: passwd: sSUID: when running a program, the owner of the corresponding process is the owner of the program file rather than the initiator; chmodu + sFileName, if the file has the execution permission, it is displayed as lowercase s; otherwise, it is displayed as uppercase S; chmodu-sFileName, SGID: special permission:
Passwd: s
SUID: when running a program, the owner of the corresponding process is the owner of the program file rather than the initiator;
Chmod u + s FileName. if the file has the execution permission, it is displayed as lowercase s; otherwise, it is displayed as uppercase S;
Chmod u-s FileName,
SGID: when running a program, the Group of the corresponding process is the Group of the program file itself, rather than the basic group of the startup program;
Chmod g + s FileName,
Chmod g + s FileName,
Sticky: in a public directory, each file can be created and deleted, but other files cannot be deleted;
Chmod o + t DIR
Chmod o-t DIR
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