Linux - Chown

The following is a Linux dictionary word of the day:

chown – change the user and/or group ownership of a given file or directory.

-R parameter for recursive traverse through all contents where command is run from.

Note: only a user with root access can use the chown command.

Example: chown -R root:name_of_group name_of_folder

Linux Wildcard and Meta Characters Instructor Guide

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In Linux, wildcards and meta-characters are invaluable tools for efficient file manipulation and pattern matching. The concepts and examples presented here explore specific commonly utilized wildcards and metacharacters, accompanied by practical and advanced command examples to demonstrate their usage in real-world scenarios. The material will be useful to a system administrator, power user, end user or student looking to further their knowledge in this area. 

The guide is meant to be utilized by an individual who will be reviewing via demonstration format these core topics.

Contents

Instructor or End User Set-up:

Create Example Files:

Common Wildcards:

Asterisk (*)

Question mark (?)

Square brackets ([])

Curly braces ({})

Tilde (~)

Backslash (\)

Exclamation mark (!)

Common Character Classes:

Asterisk (*)

Question Mark (?)

Range of Characters ([])

[characters]

[!characters]

[[:class:]]:

[[:alnum:]]

[[:alpha:]]

[[:digit:]]

[[:lower:]]

[[:upper:]]

Common Meta-Characters:

Pipe (|)

Greater than (>)

Double greater than (>>)

Less than (<)

Caret (^)

Dollar Sign ($)

Ampersand (&)

Semicolon (;)

Combining Wildcards and Meta-Characters

Conclusion:

About the Author:

Notes:https://www.amazon.com/dp/B0CFQ1S3L4/

Linux - Chgrp

The following is a Linux dictionary word of the day:

chgrp – changes group ownership to a said group.

-R parameter for recursive traverse through all contents where command is run from.

Example: chgrp -R root name_of_folder

Linux - Child process

The following is a Linux dictionary word of the day:

child process – process created by another process (which would be the parent process). Each process may create many child processes but will have only one parent process.

Linux - Chfn

The following is a Linux dictionary word of the day:

chfn – utilized to modify finger command based information. The information is stored in the /etc/passwd location. It includes the user's name, work location, work phone number, and home phone number.

Example: chfn

Linux - Checkeq (eqn or neqn)

The following is a Linux dictionary word of the day:

checkeq (eqn or neqn) – command utilized to describe equation aspects.

-v parameter to print version.

Example: eqn hello.c

  

Linux - Cfdisk

The following is a Linux dictionary word of the day:

cfdisk – partition table manipulator for a Linux drive.

m = option used to maximize the disk usage of the current partition.

-h parameter display for help text.

-V parameter to display version information.

Example: cfdisk -V

Linux - CD

The following is a Linux dictionary word of the day:

cd (also can be chdir)  – change directory.

cd .. moves backwards to the next higher subdirectory level.

cd / moves  to the highest root directory level.

Examples:

cd tmp

cd ..

cd /

Linux - CC

The following is a Linux dictionary word of the day:

cc – executes the systems C coding compiler. By default, the output will be written to the executable file a.out.

-o parameter to output the executable file to the name of ones choosing.

Examples:

cc thefile.c

cc thefile.c -o mynewfile

Linux - Cat

The following is a Linux dictionary word of the day:

cat – is short for catenate and used to display content, usually from file and directories.

/proc/ is a virtual file system that contains information about process and system information.

/proc/meminfo – information related to the memory in the system.

/proc/uptime – shows number of seconds the system is up and running. The second value in the listing shows the total number of idle seconds for each central processing unit (CPU).

Examples:

cat /proc/

cat /proc/meminfo

cat /proc/uptime

Linux - Case

The following is a Linux dictionary word of the day:

case – command utilized to conditionally perform a command based on its value.

Example:

#!/bin/sh
echo "Enter command (who, list, or cal)"
     read command
     case "$command" in
      who)
           echo "Running who"
           who
           ;;
     list)
           echo "Running ls"
           ls
           ;;
     cal)
           echo "Running cal"
           cal 
           ;;
     *)
           echo "Bad command"
           ;;
     esac
     exit 0

Linux Quiz

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The following Linux quiz is meant to be a fun way to sharpen one's Linux knowledge. The 110 questions are based upon real working aspects for those interested in Linux. Ideally the questions are those that a system administrator, power user and an end user or student looking to further their knowledge in this area will find useful. 

Contents:

Basic Simple Commands

Network Commands

Text Processing Commands

Monitoring Commands

Linux Architecture

Linux Commands & Definitions

Grep Commands

Sed Commands

Awk Commands

Basic Scripting

Linux Useful One Liner Commands Instructor Guide

https://www.amazon.com/dp/B0BX2MQ82B/

Linux is utilized within the world of information technology in a very broad manner. Therefore, the items presented here are useful one liner commands that encompass real world scenarios that are applicable to a system administrator, power user and an end user or student looking to further their knowledge in this area. 

The guide is meant to be utilized by an individual whom will be reviewing via demonstration format these useful one liner commands.

Table of Contents:

Display and List One-Liners

List Hidden Files And Directories First:

Displays Build of Distribution:

Display Disk Usage in Human Readable Format:

Display Only The Total Disk Usage (Summary) Of Current Directory:

Display Day Of The Year:

Display Lines From Head And Tail:

Press A Key To Continue:

Shows Size Of Files And Directories Sorted:

Count Files In Current Directory:

Monitoring And Using One-Liners

Most Used Commands:

Monitor CPU Speed:

View All Network Activity In Real Time:

View The TCP Connection Status By Group:

Monitoring Kernel Messages:

Total Disk Space Used In Current Directory And Root Directory:

Process Tree With Details:

Check CPU Architecture:

Services And Processes Related One-Liners

Get Running Services By Port Number:

Processes Per User Count:

File Related One-Liners

Find And Delete Specific Type Of Files:

Find All Files And Paths That Do Not Have .txt:

Find Latest Version Of Given File:

Find Files That Contain test, hello and txt:

Find Open Files:

Test Text Writing With Delay:

Vertical Text Display:

Create Sequence Of Numbers 1 To 15 In Perl:

Display Today’s Date:

Octal Dump Of A File:

Run Multiple Commands Against A File:

Match Characters In A String And Return The Matches In Groups Of Two Characters:

Match 10 Characters In A String:

Match Characters Between Brackets:

Search C File And Output Printf Statement:

Search C File And Output Printf And Return Statements:

Match String In C File That Starts With The (" and Ends With the "):