Linux

Some Essential Things after start with terminal in Ubuntu

Manual:

Most of the Commands have manuals. These manuals are an interface to the on-line reference manuals

How to use these manuals ?

Command format: man [command name]

Command: man man    … It sounds crazyyy….

  • How to get escape from manuals ?

Press Small Q to quit manuals.

 

  • Details about manuals:
    • Name of Commond
    • Synopsis
    • Description
    • Overview
    • Defaults
    • Options
    • Exit Status
    • Environment
    • Files
    • See Also
    • History
    • Copyright
    • Author
    • Some details are optional.
  • The Next Command Similar to Man command..Information(Info Command):How to use Info command?

    Command: info [command_name]

    Command: info ls

  • How to get quit from information on terminal?Press ‘q’.
  • What more u have in info command:1. Name of command with some meaning of command in short,2. Synopsis,

    3. Description,

    4. Options,

    5. Examples,

    6. Reporting bugs,

    7. Copyright information.

  • Double Tab Trick:Use whenever u forget the full command name,or when you want to see the combinations starting from letter or word.Command: blue and press tab twice.

    Output:   These are the name combinations which start from blue.

  •  How to see Previous typed commands:Command: history

    Output: all commands which u entered till last command.

  • Alternative to that,we can also see previous commands:

      Don’t enter any command,just press up arrow key to see previous commands.

    Useful: when we have big commands and  rewriting that whole command again take time and which can decrease typing time.

  • How to see menu options using Launcher ?Keep open ur one window and press Alt button.launcher will launch .It will see as..

  • How to execute command as the superuser ?

    Command: sudo [system related command name or to open system related files.]

     Sudo command allows a permitted user to execute a command as a superuser or another user,as specified by security policy.The default security policy is sudoers, which is configured via the file /etc/sudoers.

    Now we will use sudo command as below with our new command:

     

  • How to shutdown your pc through terminal ?Firstly try only-

    Command: shutdown -P 1 “It was awesome experience”

    Now,Type this:

    Command: sudo shutdown -P 1 “It was awesome experience”

    He will ask root password.. so enter your login password.

    Output:

  • To cancel the process running from terminal can be killed by pressing “Ctrl+c”.
  • Now, You are going to learn one of most important move to retrieve results i.e Wildcards:This is one of the crazy part in enjoying the typing and decreasing typing time. *** A wildcard is a character that can be used as a substitute for any of a class of characters in a search, thereby greatly increasing the flexibility and efficiency of searches. ***

     

    Standard wildcards are used by various command-line utilities to work with multiples files.These are useful in many ways for a GNU/Linux Systems and for various other uses. Commands can use wildcards to perform actions on more than one file at a time, or to find part of a phrase in a text file. There are two different major ways  that wildcards are used, they are globbing patterns/standard wildcards that are often used by the shell.

    To check manual page for wildcards:

    command: man 7 glob

    With wildcards also read manual page for regular expressions:

    command: man 7 regex

    Example: I want to go to folder Music using wildcards

    Command: cd M*

    Output:

    shrenoid@shrenoid-Inspiron-5520:~$ cd M*

    shrenoid@shrenoid-Inspiron-5520:~/Music$

    * is a asterik Wild-Card: any combination of character.

    M*: word starting with M and having n number of letter in it.

    *** Try various combinations to find content.. Best way to keep this in practise is ,Use it daily whenever you go on working on PC. ***

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