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Homework and Emergencies Homework & Coursework Questions Trouble with setting permissions and such Post 303045030 by vbe on Wednesday 11th of March 2020 03:21:55 AM
Old 03-11-2020
Welcome on board, and thanks for the effort and honesty in following our rules. This room is here to help you out with your studies, not do the work for you and has been accepted by most colleges if rules are respected.
Quote:
. I Am learning sysadmin fundamentals but it is extremely hard. Please help!
Not that hard, once the idea of what is expected from a sysadm: Administering a UNIX environment with users, printers, server(s) and maybe workstations...
Quote:
1. The problem statement, all variables and given/known data:
Set permissions on sensitive files:
I dealing with users: users have rights and permissions and UNIX permissions (basic) are limited to 3 cases:
the user/ownrt, a group owner, and the rest of the planet
Quote:
Set permissions on /etc/shadow to allow only root read and write access.
Set permissions on /etc/gshadow to allow only root read and write access.
How do you think this can be done knowing the 3 cases?
I suggest you look at the man pages of your 3 commands ls, chown, chmod
I let you start now, Im off to physio and will look and complete once back
 
Test Your Knowledge in Computers #194
Difficulty: Easy
Perl was ranked in the top 10 according to the TIOBE Index for October 2019.
True or False?

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CHMOD(1)								FSF								  CHMOD(1)

NAME
chmod - change file access permissions SYNOPSIS
chmod [OPTION]... MODE[,MODE]... FILE... chmod [OPTION]... OCTAL-MODE FILE... chmod [OPTION]... --reference=RFILE FILE... DESCRIPTION
This manual page documents the GNU version of chmod. chmod changes the permissions of each given file according to mode, which can be either a symbolic representation of changes to make, or an octal number representing the bit pattern for the new permissions. The format of a symbolic mode is `[ugoa...][[+-=][rwxXstugo...]...][,...]'. Multiple symbolic operations can be given, separated by com- mas. A combination of the letters `ugoa' controls which users' access to the file will be changed: the user who owns it (u), other users in the file's group (g), other users not in the file's group (o), or all users (a). If none of these are given, the effect is as if `a' were given, but bits that are set in the umask are not affected. The operator `+' causes the permissions selected to be added to the existing permissions of each file; `-' causes them to be removed; and `=' causes them to be the only permissions that the file has. The letters `rwxXstugo' select the new permissions for the affected users: read (r), write (w), execute (or access for directories) (x), execute only if the file is a directory or already has execute permission for some user (X), set user or group ID on execution (s), sticky (t), the permissions granted to the user who owns the file (u), the permissions granted to other users who are members of the file's group (g), and the permissions granted to users that are in neither of the two preceding categories (o). A numeric mode is from one to four octal digits (0-7), derived by adding up the bits with values 4, 2, and 1. Any omitted digits are assumed to be leading zeros. The first digit selects the set user ID (4) and set group ID (2) and sticky (1) attributes. The second digit selects permissions for the user who owns the file: read (4), write (2), and execute (1); the third selects permissions for other users in the file's group, with the same values; and the fourth for other users not in the file's group, with the same values. chmod never changes the permissions of symbolic links; the chmod system call cannot change their permissions. This is not a problem since the permissions of symbolic links are never used. However, for each symbolic link listed on the command line, chmod changes the permis- sions of the pointed-to file. In contrast, chmod ignores symbolic links encountered during recursive directory traversals. STICKY FILES
On older Unix systems, the sticky bit caused executable files to be hoarded in swap space. This feature is not useful on modern VM sys- tems, and the Linux kernel ignores the sticky bit on files. Other kernels may use the sticky bit on files for system-defined purposes. On some systems, only the superuser can set the sticky bit on files. STICKY DIRECTORIES
When the sticky bit is set on a directory, files in that directory may be unlinked or renamed only by root or their owner. Without the sticky bit, anyone able to write to the directory can delete or rename files. The sticky bit is commonly found on directories, such as /tmp, that are world-writable. OPTIONS
Change the mode of each FILE to MODE. -c, --changes like verbose but report only when a change is made -f, --silent, --quiet suppress most error messages -v, --verbose output a diagnostic for every file processed --reference=RFILE use RFILE's mode instead of MODE values -R, --recursive change files and directories recursively --help display this help and exit --version output version information and exit Each MODE is one or more of the letters ugoa, one of the symbols +-= and one or more of the letters rwxXstugo. AUTHOR
Written by David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for chmod is maintained as a Texinfo manual. If the info and chmod programs are properly installed at your site, the command info chmod should give you access to the complete manual. chmod (coreutils) 4.5.3 February 2003 CHMOD(1)

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