File security - The Diigo Meta page

• 21 Sep 16
  

  pleiadian53

  "When applied to an entire directory, however, the sticky bit has a different meaning. In that case, a user can only change files in this directory when she is the user owner of the file or when the file has appropriate permissions. This feature is used on directories like /var/tmp, that have to be accessible for everyone, but where it is not appropriate for users to change or delete each other's data. The sticky bit is indicated by a t at the end of the file permission field:
  
  
  mark:~> ls -ld /var/tmp
  drwxrwxrwt 19 root root 8192 Jan 16 10:37 /var/tmp/"

  linux file access security

  • Files without permissions don't exist on Linux. The standard file permission is determined by the mask for new file creation. The value of this mask can be displayed using the umask command:

    bert:~> umask 0002

  • The standard file permission is determined by the mask for new file creation. The value of this mask can be displayed using the umask command:

    bert:~> umask 0002

  • When applied to an entire directory, however, the sticky bit has a different meaning. In that case, a user can only change files in this directory when she is the user owner of the file or when the file has appropriate permissions. This feature is used on directories like /var/tmp, that have to be accessible for everyone, but where it is not appropriate for users to change or delete each other's data. The sticky bit is indicated by a t at the end of the file permission field:

    mark:~> ls -ld /var/tmp drwxrwxrwt 19 root root 8192 Jan 16 10:37 /var/tmp/
  • comments like, "It worked yesterday," and "When I run this as root it works," are most likely caused by the wrong file permissions.
  • chmod 500 directoryTo protect yourself from accidentally removing, renaming or moving files from this directory.

  3 more annotations...

• 15 Sep 11
  

  Liudas S

  normal mode for directory accesable form grous members 775

  file security linux

• 23 Jan 10
  

  vivek saini
  • The + and - operators are used to grant or deny a given right to a given group
  • rimary group is the one that you get assigned from the /etc/passwd file. The fourth field of this file holds users' primary group ID, which is looked up in the /etc/group file.
• 09 Mar 09
  

  roland_mai

  linux permissions primary-user

• 21 Feb 07
  

  Chu Yeow Cheah

  Access rights in Linux. Remember to use newgrp to change the active group.

  linux sysadmin

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