Welcome - 9/30/17

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BEGINNING CLI USAGE

ALE - Atlanta Linux Enthusiasts

-   http://ale.org/ - sign up for our email lists
    -   General email list - ale
    -   ALE Study Group list - ale-study
-   Meetup.com Group
    https://www.meetup.com/ALE-Atlanta-Linux-Enthusiasts/ (google
    "ale linux")

THANKS FOR COMING OUT!
We are volunteers. Just some guys trying to spread Linux knowledge.


Hands-On Today

GET YOUR LINUX COMPUTERS UP
OPEN A TERMINAL


Other Places For Info

-   EdX - free basic Linux training
-   Linux.com - free basic Linux training
-   CheatSheets.org
-   www.bob-carnaghi-online.net/index.html  - ACC Linux Classes
-   probably millions of others ...

-   Amazon Prime Videos
    -   _Ubuntu Linux: Go from Beginner to Power User_
    -   _ITPROtv_ is another search term;
-   manpages
-   Dead Trees - books
-   LPI website
-   Linux Command Line Book


Jumping In ... ls

OPEN A TERMINAL - ANY TERMINAL ...

-    ls - list files and directories
-    ls -F
-    ls -al
-    ls -tl
-    ls -l | sort -h


How Much Storage Available?

EXAMPLES:

     $ du /usr
     $ du -h ~/
     $ df -h .
     $ df
     $ df -i
     $ find /misc/Stuff -type f -size +3G \
         -exec ls -lh {} \; 

-    _du_ and _df_ and _find_
-    _du_ works on files and directories
-    _df_ works on partitions and logical volumes
-    inodes run out too - df -i
-    _find_ can search for specific things, sizes, etc.


Main Directories

-    HOME directory, $HOME, ~/ - all the same thing
-    root directory, / - top level of all files and directories
-    root HOME directory - /root - on Linux systems.
-    /tmp - a temporary directory. Anyone/nobody can write there. Wiped
    at reboot
-    /bin, /usr/bin - where more programs are installed
-    /etc - where most system and package manager settings are stored
-    /usr/local/ - where non-package managed, but system-wide programs
    belong


Linux File System Hierarchy Overview

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File System Hierarchy


pwd

EXAMPLES:

    $ cd /tmp                  
    $ pwd

-    Present Working Directory - where you currently are in the file
    system.
-    Many prompts display it.


cd relative and absolute paths

These are all the same, if you are in your HOME on a normal Linux
system.
cd ~  cd  cd $HOME  cd /home/{your-userid}  cd ~/

A different example:

    cd
    pwd
    cd /etc
    cd
    cd etc
    cd ../../etc


Cmd History

EXAMPLES:

    $ history
    $ !!
    $ !-5
    $ !543
    $ !vi
    $ man history  # to learn more

-    Up arrow
-    ctrl-L/R arrow ...
-    Can edit the command line - move/delete words, etc.

    $ ^string1^string2^
    Quick substitution.  Repeat the 
    last command, replacing string1 
    with string2.  Equivalent to 
    "!!:s/string1/string2/" 


Tab Completion

-    Type 3 characters at a time+{tab}
-    Many command options might be provided
-    Depends on the bash-completion package
-    To see which commands beginning with _ls_ exist in your PATH,

     $ ls{tab}{tab} 

     $ rdi{tab}- -{tab}-l{tab}-i{tab}-s{tab} 

 Practice this. Any interesting ls-cmds?
Tab Completion Explained


Break Time

5 MINUTES


Shells

-    There are different shells - command lines.
-    sh, bash, ksh, csh, tcsh, zsh, fish ... others.
-    Don't like the interface on the command line?
-    You can change it, but probably shouldn't for 1 yr

    man -k shells

or

    apropos shells


cp, mv, mkdir, rmdir, and File Management

EXAMPLES:

     $ cp /tmp/foo* ~/bin/
     $ mv /tmp/foo.txt ~/Docu*/
     $ mv /tmp/foo.txt ~/*ts/
     $ rm ~/bin/foo*
     $ rm ~/bin/*oo
     $ mkdir ~/bin 
     $ mkdir -p /tmp/foo/foo/foo
     $ rmdir /tmp/foo  #  work?
     $ rmdir -p  /tmp/foo  #  work?
     $ rmdir -p  /tmp/foo/foo/foo  #  work?*

-    Copy - cp {source} {dest}
-    Move - mv {source} {dest} # files or dirs
-    Remove - rm {list}
-    Rename - what command might work for this?
-    Make directory - mkdir
-    Remove directory - rmdir
-    Pattern matching / _globbing_ can be used where it makes sense


Recursive Options

-    Copy - cp -r {source} {dest}
-    Remove - rm -r {list}
-    Move doesn't need recursive - just move the directory


Calendar

          September             October               November              
     Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa 
                     1  2   1  2  3  4  5  6  7            1  2  3  4
      3  4  5  6  7  8  9   8  9 10 11 12 13 --   5  6  7  8  9 10 --
     10 11 12 13 14 15 16  15 16 17 18 19 20 21  12 13 14 15 16 17 --
     17 18 19 20 21 22 23  22 23 24 25 26 27 28  19 20 21 22 23 24 --
     24 25 26 27 28 29 30  29 30 31              26 27 28 29 30      
     


Thanks / Feedback

-   Thanks for coming.
-   Please let us know how we are doing.
-   Slides are here:
    http://lpi.jdpfu.com/2017-Fall/17-09-30-Basic_Cmds.txt
-   Email - DJPfulio - at - jdpfu.com

blog.jdpfu.com