cheat sheets.

Cheat Sheet Title: [ no_spaces_alphanumeric_only ]

Cheat Sheet:
chmod: a Unix utility for managing file permissions Modes can be expressed in octal or human-readable: Description | Octal | Human-readable ----------------------------------+--------+--------------- Set user write | 200 | u=w Set user rwx, group and others rx | 755 | u=rwx,go=rx Add group read | - | g+w Remove all execute | 111 | a-x Set user rws, everyone else none | 4700 | u=rwxs,go-rwx Add user sticky | - | u+s Add group sticky | - | g+s Octal ----- With three-digit octal notation, each numeral represents a different component of the permission set: user class, group class, and "others" class respectively. Each of these digits is the sum of its component bits. As a result, specific bits add to the sum as it is represented by a numeral: * The read bit adds 4 to its total, * The write bit adds 2 to its total, * The execute bit adds 1 to its total. Examples -------- "-rwxr-xr-x" would be represented as 755 in three-digit octal. "-rw-rw-r--" would be represented as 664 in three-digit octal. "-r-x------" would be represented as 500 in three-digit octal. Example: Make foo u=rwx and go=rx: $ chmod u=rwx,go=rx foo Example: Make foo u=rwx and go=rx (in octal): $ chmod 755 foo Example: Find all subdirectories, put them in 'mygroup', make them group sticky: $ find . -type d -exec chgrp mygroup \{\} \; $ find . -type d -exec chmod g+s \{\} \;

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