6-7 Flashcards
What is the maximum filename length in Linux?
255
Three names for the file permission categories:
user, group, other
using the setfacl command, what option will delete an ACL (the whole thing)?
-b (bomb, -d is for default, not delete)
When using the setfacl command, what option will add an ACL?
-m (modify)
What does the +/- mean on the first permission of a file?
ACL is or is not set.
T/F: When setting permissions symbolically, commas and space should not be placed between permissions for one group.
True
Example: chmod g=rwx,o-r
What is wrong with the following link command?
ln -s /home/stu25/fstab.linkname /etc/fstab
the linkname and /etc/fstab should be reversed.
you put the real thing first, then the destination.
The Linux _____ sets a standard directory structure and promotes interoperability.
FHS
Using a(n) _____ will allow a finer grain control over a filesystem.
ACL
Given r–rw-r–, can the owner edit the file if he/she is a member of the group?
False/no. Owner/user perms override the others.
chmod uses CAPTIAL -R!
true
All commands support the use of ACLs.
False
Spaces are supported in Linux filenames, but not recommended.
True
Using the ln command, what option will create a HARD
link?
no option is required (-s is for creating a symbolic/soft link)
What Linux command will remove a filesystem link?
rm, NOT rmln
What is the name of the Kernel security module for access control security policies?
SELinux
Setting an ACL overwrites other permissions a user has over a file. This is their effective rights.
True.
What permission would allow a user to only GET INTO a folder, but not see or modify anything?
Execute
Which file/directory locating command is based on a database?
locate
Which option cannot be used when creating a compressed tar archive?
-x (stands for extract)
Of w, who, and users, which command will give the most information?
w lol its the shortest one
The nano text editor is based on the micro text editor.
False
Which comprehensive date utility will display details on the date, time, NTP synch., and if daylight savings time is active?
timedatectl. its the longest/most comprehensive
Which compression util. is the oldest and was originally used with Solaris UNIX?
compress
What two commands will display and change the server hostname?
hostnamectl, hostname
Which newer and best compression util. was the used in our lab environment?
xz (best compression)
What option cannot be used when EXTRACTING a compressed tar archive?
-c (this means create)
Options are order sensitive when using tar.
True
Which key does NOT start entry mode in vi?
u (but a, i, O do)
Which keystroke in vi copies a line of text?
yy
Which is NOT a vi editor mode?
Insert (entry, command and last line are the correct modes)
Which compression utility is most common in the Linux environment?
gzip
Which newer pager file viewing util. is the most feature rich?
most (its self-explanatory)
Which zip util. has great, but not the best compression?
bzip2 (2nd place, its ok.)
What command deletes a file and makes it unrecoverable?
shred
lshw, lspci, lsusb display information about the server hardware.
True
The option will view the tarball without opening it?
-t (stands for table of contents)
The _______ command converts a command’s output to another command’s arguments.
xargs
Which file viewing util. will display FILE LINES in REVerse order?
rev
Which file viewing util. will display the file [content] in reverse order?
tac
dmesg displays kernel messages.
True
What does tar stand for?
Tape archive
Which file/directory locating command has the most options and is most powerful, but is the slowest when locating items?
find
What do lpstat, lpr, lpq and lprm have in common?
They are printing related commands
Why use editor like VI?
all of the above (theyre good things)
What are the purposes of:
df
testdisk
free
du
df - displays disk statistics per partition
testdisk - disk drive troubleshooting tool
free - displays physical and virtual RAM statistics
du - displays disk consumption of directories
What permission can allow users to change their own passwords?
SetUID
Filename extensions are NOT optional. They are required for all files.
False, dont need them.
There are always ____ parts to a find command.
4
1: find
2: where do you want to look? (/ is the best choice if unknown)
3: options pertaining to the name of the file such as -iname
4: keywords
example: find /etc -iname syscon*
