Ubuntu chmod权限

chmod with Numbers

Usage: chmod {options} filename OptionsDefinition1execute2write4read OwnerGroupOtherread & writeread & writeread & write4+2=64+2=64+2+1=7

Example:

user@host:/home/user$ chmod 667 filename

chmod with Letters

Usage: chmod {options} filename OptionsDefinitionuownerggroupootheraallxexecutewwriterread+add permission-remove permission=set permission

Example:

user@host:/home/user$ chmod a+r filename