UNIX COMMANDS
Sno
|
Command
|
Description
|
1
|
date
|
Displays
the Date
|
2
|
cal
|
Displays
the calendar
|
3
|
pwd
|
Print
name of current/ working directory
|
4
|
cat
|
For
creating and displaying files
|
5
|
ls
|
Displays
list of files
|
6
|
chmod
|
Change
permissions
|
7
|
mkdir
|
To
create a directory
|
8
|
cd
|
To
change a directory
|
9
|
cd ..
|
To
jump back one level in directory
|
10
|
rm
|
Remove
a file
|
11
|
rmdir
|
Remove
a directory
|
12
|
cp
|
For
Copying files
|
13
|
mv
|
For
moving and renaming files
|
14
|
wc
|
Count
characters, words and lines
|
15
|
head
|
Displays
first part of file
|
16
|
tail
|
Displays
last part of file
|
17
|
grep
|
Searching
for a pattern in file
|
18
|
man
|
manual
|
19
|
telnet
|
Log
into another machine
|
1) date:
(Displays the date)
Description: Use this
command to check the date and time
Syntax: $date
Example: $date
Mon Jan 6 04:40:00 EDT 2015
2) cal:
Description: This command is used to see the calendar of any specific month or
complete year.
Syntax: $ cal
Example: $ cal
displays the current calendar.
3) pwd:
Description: print name of current working directory.
Syntax: $pwd
Example: $pwd
/home /rit
4) Cat:
Description: this command is used to create, view and concatenate files.
Syntax: 1. $cat >
file name - for creating the file
2. $cat <file name> – for viewing the file content
3. $cat <file1><file2>
- for concatenating the contents of file1 to file2.
4.$cat >> <file
name -for appending content of the file
Example: $cat> ram
Ram
Is
A
Good
Boy
(at the end of file
press ctrl+D to save the file)
5) ls:
Description: to list out all the files & directories available in our directory.
Syntax : ls
Ex: ls
ram
rit sita
ls r*
ram
rit
6) chmod:
description: this command is used to change the permission of a file or
directory.
Syntax: chmod o/v/g
+/- r/w/x <file name>
Example:
-rw-r- -r—
$chmod 0+wx ram
$chmod 0-x ram
-rw-r- -rw-
7) mkdir:
description: use this command to create a directory.
$mkdir<directory
name>
Ex: mkdir abc
8) cd:
(change director)
Description: use cd
to change directory. Use pwd to see in what directory you are.
Ex: $cd abc
$pwd
/home/rit/abc.
9) cd
..
Description: to jump
back one level in directories.
Syntax: $cd ..
/home/rit/abc
cd ..
/home/rit
10)
rm (removes a file)
Description: use rm
to remove a file from your directory.
Syntax: $rm <file
name>
$rm sita
11)
rmdir (remove a
directory)
Description: use this
command to remove a directory but the directory should be empty (no files).
Syntax: $rmdir
<directory name>
Ex: $rmdir abc.
12)
cp (for copying
files)
Description: use cp
copy files to another file or directory.
Syntax: $cp
<source> <destination>
Ex: $cp ram xy
13)
mv: (for moving and
renaming)
Description : use mv
for changing the name of the file.
Syntax: $mv <old
file name> <new file name> for renaming
$Mv <file name
> <directory name> for moving to directory
14)
wc : (word count)
Description: use this
command to count the number of characters, words and lines in a file.
Syntax: $wc <file
name>
Ex :$wc zzz
4 9
41 zzz
15)
head: (display the
first part of a file)
Description: use this
command to see the head of the file.
Syntax: $head
<file name> displays the first 10 lines of a file
Ex: $head -2 zzz
16)
tail: (displays the
last part of a file)
Description: use this
command to see the last part of a file.
Syntax: tail<file
name> for the last 10 lines of file
Ex: $tail -2 zzz
Nice
Behavior
17)
grep: (searching for
a pattern in a file)
Description: the grep
program searches a file/ files for lines that have a certain pattern.
Syntax: $grep pattern
files
Example: $grep is zzz
xy
18)
man (manual)
Description: this
command acts as a manual
Syntax: $man
<command name>
Ex: $man cat
19)
telnet:
description: telnet
is used to log in another machine
syntax: $telnet ip
address
ex: $telnet
10.10.13.32
