3109645
Description
Mind Map by silon10.ev, updated more than 1 year ago
|
Created by silon10.ev
over 8 years ago
|
|
UNIX
- Pathname
- Root
- Always starts with forward
slash
- Always starts with forward
slash
- Relatives
- Relative parthname
are quickly to use
than absolute
pathnames, because
their point of
departure is the
current working
directory rather
than the root
- Relative parthname
are quickly to use
than absolute
pathnames, because
their point of
departure is the
current working
directory rather
than the root
- Absolutes
- An absolute
pathname
identifies a file by
starting at the root ,
irrespective of
which directory the
user is in at the
time
- An absolute
pathname
identifies a file by
starting at the root ,
irrespective of
which directory the
user is in at the
time
- Root
- Commands to work
with directories
- Command ls
to list the
contents of a
directory to
screen
- -a displays all
the files in the
current directory
including hidden
files, which are
prefixed with a
dot
- -f identifies
the types of
files in a
listing
- -G colorizes
screen output
so that
categories of
files can be
seen easly
- -l displays
details about
each file in a
directory, such
as its type,
permissions,
owner, size stc
- -r reverses the
order in which
the files in a
directory would
be displayed by
default
- -t displays
files according
to their
modification
times
- -a displays all
the files in the
current directory
including hidden
files, which are
prefixed with a
dot
- Command ls
to list the
contents of a
directory to
screen
- cat command
allows you to view
and modify the
contents of a file.
it also allows you
to combine two
existing files to
create a new one
- -b numbers all
the lines in a
file except
blank lines
- -n numbers
all the lines
in a file
- -u allows you to
prevent the command
from buffering screen
output. this is useful
when the file is large
and the system
memory is limited
- -b numbers all
the lines in a
file except
blank lines
- Creating a File
- touch command to
create a new file with
the name you specify,
default permissions
and can modify
existing files
- Redirections before
command such as
echo, cat or ls is
executed, you can
redirect its output
to a file using the >
notation
- Application Files
are often created
when you use an
application such as
vi, or macs text
editor. To edit, save
an give it a name
- touch command to
create a new file with
the name you specify,
default permissions
and can modify
existing files
- rm command
to delete files,
either simgle
or in multiple
- -r to delete
the contents
recursively
- -P Overwrite regular
files before deleting
them
- -d like the r
option, attempt to
remove directories
as well as files
- -v Be verbose
when deleting
files, displaying
each as it is
remove
- -i Request
confirmation
before removing
the specified file
- -f Attempt to
remove files
without prompting
for confirmation,
irrespective of file
permission
- -r to delete
the contents
recursively
- Permissions
- read = 4, read
files or list the
contents of a
directory
- white = 2 to
modify a file
or create an
delete in a
directory
- execute = 1 to
run a file, if it's
a program or
script, or
access files in
the directory
- Every file and
directory also has
three groups "owner"
"group" "other user"
- read = 4, read
files or list the
contents of a
directory
- wilecards and regular expresion
- the * wildcard
matches zero or
more instances
of any character
- the ? wildcard
matches a
single instance
of any character
- the [ ] wildcard to
match sets of
chararcters. You
can include lists of
characters or
specify a range
- the ! wildcard
within [ ]
matches any
chararctes that is
not listed in the
square brakets
- the * wildcard
matches zero or
more instances
of any character
- the find
command seach a
file when you do
not know where it
is located
- -atime to find
files according
to their access
time (find
/-atime 2)
- -ctime to find
files according
to their
modification
time (fine
/-ctime 2)
- -group to fine
files according
to their owner
(fine /-group
<name_group>)
- -size to fine
files according
to their size
(fine /-size 10)
- -name fine /home -name <namefile>
- -atime to find
files according
to their access
time (find
/-atime 2)
- grep to search
the content
within local files
using the siyntax
grep
<options><regular
exprexion> <file>
- -c option
suppresses output
by printing a count
of maching lines
for each input file
- -h to suppress
prefixing of
filesnames on
output when
searching multiple
files
- -H prints the
filename for each
match
- -i allows you to
ignore case
distinction in
both the pattern
and input files
- -n when you want
to prefix each line
of output with line
number within its
input file
- -v to print
nonmatches lines
for each input file
- -w to search for a specific pattern as word
- -c option
suppresses output
by printing a count
of maching lines
for each input file
Want to create your own Mind Maps for free with GoConqr? Learn more.