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===== permission =====

==== chmod ====

Make a file execuable:

  chmod +x script_name
or
  chmod 755 script_name

Grant all rights:

  chmod +rwxrwxrwx /path/to/folder/or/file

Remove all rights:

  chmod -rwxrwxrwx /path/to/folder/or/file

chmod:

  4 - read
  2 - write
  1 - execute  
  --------------------
  = 7

example:

  chmod 777 /path/to/folder/or/file                    #all rights for owner,group and others
  chmod 711 /path/to/folder/or/file == rwx--x--x
  chmod ugo=rwx /path/to/folder/or/file                #u=user g=group o=OTHERS  
  chmod u=rwx,g=r,o=r test

Another examples:

  1755 gives drwxr-xr-t
  2755 gives drwxr-sr-x
  3755 gives drwxr-sr-t
  4755 gives drwsr-xr-x
  5755 gives drwsr-xr-t
  6755 gives drwsr-sr-x
  7755 gives drwsr-sr-t
  
==== ACL ====

setfacl / getfacl:

add:
  setfacl -m g:users:rwx acl_test/      #set acl for group(rwx)
  setfacl -m u:tmade:rwx acl_test/      #set acl for user(rwx)
  setfacl -m u:tmade:--- acl_test/      #set acl for user (000/ ---)
  

remove:
  setfacl -x g:users acl_test/          #remove acl for group(rwx)
  setfacl -x u:tmade acl_test/          #remove acl for user(rwx)

set default acl for a directory:
  setfacl -d -m u:tmade:rw /tmp/acl_test/

remove default acl for a directory:
  setfacl -b folder/filename