AWS Solution Architect Prep Guide PDF

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Shell Scripting

Shell Scripting Tutorial


  • Advantages of Shell Scripting
  • Hello World!
  • Variables
  • Special Variables
  • Arithmetic operators
  • Relational Operators
  • Logical Operators
  • If statement
  • If else Statement
  • If else if statement
  • Nested If statement
  • While Loop
  • For Loop
  • Case Statement
  • Functions
  • Arrays
  • IFS
  • Here Documents
  • Debug Shell Scripts
  • Shell Scripting Real Time Project Details
  • Further Study Resources and Shell Scripts Location
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RHCE Exam Practice Guide

RHCE - Red Hat Certified Engineer Using below articles.

Q1:  https://arkit.co.in/yum-yellowdog-updater-module-local-installation/
Q2. https://arkit.co.in/selinux-security-enhance-linux/
Q4. https://arkit.co.in/ssh-server-secure-shell-installation-centos-7/
Q5.  http://www.techarkit.com/ipv6-address-assign-to-linux/
Q6. https://arkit.co.in/rhel7-how-to-configure-nic-teaming/
Q7. http://www.techarkit.com/port-forwarding-firewall-rule/
Q8. https://arkit.co.in/nfs-server-configuration-rhel7/
Q9, Q10 & Q11. https://arkit.co.in/kerberized-nfs-server-linux/
Q12 & Q13.  https://arkit.co.in/simple-way-create-manage-samba/
Q14.  https://arkit.co.in/samba-share-multi-user-access/
Q15. https://arkit.co.in/web-server-installation/
Q16. https://arkit.co.in/creating-secret-website/
Q17. https://server-computer.com/web-hosting-virtual-configuration/
Q18. https://arkit.co.in/secure-web-server/
Q19. https://www.youtube.com/watch?v=CZwHe4mb5Ks
Q20 & Q21. https://arkit.co.in/iscsi-server-installation-providing-remote-block-storage/
Q22.  https://arkit.co.in/install-mariadb-10-2-rhel-7/
Q25. https://arkit.co.in/create-multiple-users/

#RHCE #Certification #techarkit
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Shell Scripting Video Tutorial For Beginners

Shell scripting is essential for IT operations and automation. Programming Knowledge is important nowadays. This shell scripting video tutorial will help beginners to understand some of the basics of shell script programming, and hope to introduce to powerful programming available under the bash shell. As such, it has been recorded putting layman in mind. Explained from scratch even few supportive commands, shell environment. Shell scripting is base for learning any programming language such as Python and Perl. Shell scripting video tutorial for beginners and intermediate.

  1. Shell Scripting course content
  2. Linux Basics
  3. Directory Structure
  4. Basic Linux Commands
  5. Copy, remove, Move and time Commands
  6. Grep Command
  7. Head and Tail Commands
  8. tr and wc commands
  9. Linux Disk Utilities
  10. Getting Help From Command Line Interface
  11. who, hostnamectl and uname
  12. Find Files and Directories in Linux
  13. Analyze CPU and Processes
  14. Vi text Editor
  15. Awk and Sed - Stream Editor
  16. Introduction to Linux GUI
  17. Cut Required portion of Text from text files
  18. Merging Multiple Files
  19. Copy files securely
  20. Change Files and Directories Permissions
  21. Compressing Files and Directories
  22. Crontab to Schedule future Jobs
  23. Scripting vs Programming
  24. What is Shell Scripting and Its Advantages
  25. PATH Environment Variable
  26. Symbols used in Shell Scripting
  27. Types of shells in Linux
  28. Write Exciting First Shell Script
  29. Make your own shell scripting template
  30. Quotation Marks
  31. Variables Explained
  32. Special Variables
  33. count Command Line Arguments
  34. Arthematic Operators
  35. Relational Operators
  36. Logical Operators
  37. IF Statement in shell Scripting
  38. If Else Statement
  39. If else if statement
  40. Nested If statement
  41. While Loop
  42. For Loop
  43. Case Statement
  44. Continue Statement
  45. Set Command Bash Scripting
  46. Shift Positional Parameters
  47. Functions
  48. Until Loop
  49. Arrays in Shell Scripting
  50. Getopts
  51. Making Real-time CPU Monitoring Shell Script
  52. Disk space Monitoring
  53. Debug Shell Scripts
  54. Here Documents
  55. Internal Field Separator
  56. Eval Command
  57. Execute Multiple Scripts from Single Script
  58. Logger Command
  59. Warp Up


Please Comment your feedback

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Linux Tutorial For Beginners - RHCSA Certification Complete Tutorial

In this post i am going to discuss about how to practice Linux/How to learn Linux from scratch. A Complete Linux Tutorial for Beginners. 

RHCSA = Red Hat Certified System Administrator Certification is the first entry level certification. Anyone who want to start their career in IT administration or Linux Administration they can do this certification.

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CDH Manual installation in single Node

Cloudera Distribution Apache Hadoop single Node Installation Step by Step guide Centos 7. Completely manual process.

 # yum install java

 # java --version
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

 # useradd -g hadoop hadoop

 # passwd hadoop
Changing password for user hadoop.
New password:
BAD PASSWORD: The password contains the user name in some form
Retype new password:
passwd: all authentication tokens updated successfully.

 # su - hadoop

 $ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
Created directory '/home/hadoop/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:n4d58SIkG9mWM8P6QS8YjxCNxbkhaYKhCNJwFH8a3A8 hadoop@hyd-hyd-hadoop-test.arkit.co.in
The key's randomart image is:
+---[RSA 2048]----+
|++=+   o..       |
|+ooo..+++        |
|o   +oE..o       |
|     + +.+ .     |
|    . . S @ .    |
|       . # O o   |
|        = X = .  |
|         . * .   |
|          .      |
+----[SHA256]-----+

 $ cat ~/.ssh/id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDkk39QsAbOJwMVy7AenkzYg6nR9YDhVaqwUna9bR2Tu8XsHUYy+x9TiWtrj+3awAb8uuMHqV3Q+aW2Pe3FEwJvWRv0j3tqhYD9UgM4blMAEdHnLhj0bO+AT+y3yhxCcb+7+WEgv1B0pz9HaD8D4NDiYIizUktcetYT3SswS3vZxJrSDr5BsepnHQDMcAgF4xpZwXIbJaoNuQIlO93+L/2OiIqlsjb2BKiBf5EoNTFZt9lJVvCyiV29ujH2eb6zktyIn+D7Z/591Esk1zEcIwIjsjvTJFpb9HXYHJqQhAYC0VrHNRnzRRyGJguzGkFUK8ppTbI7P+W29KBDbpfg7T8z hadoop@hyd-hadoop-test.arkit.co.in

 $ cd ~/.ssh/
$ ls
id_rsa  id_rsa.pub
$ touch authorized_keys
$ vi authorized_keys
### Paste Above id_rsa.pub content ###
$ chmod 0600 authorized_keys

 Downloaded Java fro m oracle site and installed
# yum localinstall jdk-8u172-linux-x64.rpm

 Installed:
  jdk1.8.x86_64 2000:1.8.0_172-fcs

 Complete!

 # export JAVA_HOME=/usr/java/jdk1.8.0_172-amd64/

# sudo yum clean all; sudo yum install hadoop-yarn-resourcemanager
# sudo yum clean all; sudo yum install hadoop-hdfs-namenode
# sudo yum clean all; sudo yum install hadoop-hdfs-secondarynamenode
# sudo yum clean all; sudo yum install hadoop-yarn-nodemanager hadoop-hdfs-datanode hadoop-mapreduce -y
# sudo yum clean all; sudo yum install hadoop-mapreduce-historyserver hadoop-yarn-proxyserver -y 
# sudo yum clean all; sudo yum install hadoop-client

 
--Disable Firewall
systemctl stop firewalld/iptables/ip6tables
systemctl disable firewalld/iptables/ip6tables

service stop iptables
service stop ip6tables

chkconfig iptables off
chkconfig ip6tables off

--Disable SELinux 
Edit file /etc/selinux/config

SELINUX=disabled

Note: Reboot is required to take effect

 root@hyd-hadoop-test:~# cp -r /etc/hadoop/conf.empty/ /etc/hadoop/conf.my_cluster

 root@hyd-hadoop-test:~# sudo alternatives --install /etc/hadoop/conf hadoop-conf /etc/hadoop/conf.my_cluster 50

 root@hyd-hadoop-test:~# sudo alternatives --set hadoop-conf /etc/hadoop/conf.my_cluster
root@hyd-hadoop-test:~# sudo alternatives --display hadoop-conf
hadoop-conf - status is manual.
 link currently points to /etc/hadoop/conf.my_cluster
/etc/hadoop/conf.empty - priority 10
/etc/hadoop/conf.impala - priority 5
/etc/hadoop/conf.my_cluster - priority 50
Current `best' version is /etc/hadoop/conf.my_cluster.

 Edit the configuration file and add
# cat /etc/hadoop/conf.my_cluster/core-site.xml

 <configuration>
        <property>
          <name>fs.defaultFS</name>
          <value>hdfs://hyd-hadoop-test:8020</value>
          <description>NameNode URI</description>
        </property>

         <property>
          <name>fs.trash.interval</name>
          <value>30</value>
        </property>

         <property>
          <name>fs.trash.checkpoint.interval</name>
          <value>31</value>
        </property>

 </configuration>

 # cat /etc/hadoop/conf.my_cluster/hdfs-site.xml
<configuration>
  <property>
     <name>dfs.namenode.name.dir</name>
     <value>file:///data/hadoop-hdfs/cache/hdfs/dfs/name</value>
  </property>

   <property>
     <name>dfs.datanode.name.dir</name>
     <value>file:///data/hadoop-hdfs/cache/hdfs/dfs/data</value>
  </property>
  <property>
     <name>dfs.permissions.superusergroup</name>
     <value>hadoop</value>
  </property>

   <property>
     <name>dfs.webhdfs.enabled</name>
     <value>true</value>
  </property>

 </configuration>
root@hyd-hadoop-test:~# mkdir -p /data/hadoop-hdfs/cache/hdfs/dfs/name

 root@hyd-hadoop-test:~# mkdir -p /data/hadoop-hdfs/cache/hdfs/dfs/data

 root@hyd-hadoop-test:~# chown -R hdfs:hdfs /data/hadoop-hdfs/cache/hdfs/dfs/data/

 root@hyd-hadoop-test:~# chown -R hdfs:hdfs /data/hadoop-hdfs/cache/hdfs/dfs/name/
root@hyd-hadoop-test:~# chmod 775 /data/hadoop-hdfs/cache/hdfs/dfs/name

 root@hyd-hadoop-test:~# chmod 775 /data/hadoop-hdfs/cache/hdfs/dfs/data/
format namenode
# sudo -u hdfs hdfs namenode -format

 18/08/14 12:53:13 INFO namenode.FSImage: Allocated new BlockPoolId: BP-90611475-10.103.2.104-1534231393025
18/08/14 12:53:13 INFO common.Storage: Storage directory /data/hadoop-hdfs/cache/hdfs/dfs/name has been successfully formatted.
18/08/14 12:53:13 INFO namenode.FSImageFormatProtobuf: Saving image file /data/hadoop-hdfs/cache/hdfs/dfs/name/current/fsimage.ckpt_0000000000000000000 using no compression
18/08/14 12:53:13 INFO namenode.FSImageFormatProtobuf: Image file /data/hadoop-hdfs/cache/hdfs/dfs/name/current/fsimage.ckpt_0000000000000000000 of size 317 bytes saved in 0 seconds.
18/08/14 12:53:13 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
18/08/14 12:53:13 INFO util.ExitUtil: Exiting with status 0
18/08/14 12:53:13 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at hyd-hadoop-test/192.168.2.5
************************************************************/

 Start HDFS
root@hyd-hadoop-test:~# for x in `cd /etc/init.d ; ls hadoop-hdfs-*` ; do sudo service $x start ; done
starting datanode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-datanode-hyd-hyd-hadoop-test.arkit.co.in.out
Started Hadoop datanode (hadoop-hdfs-datanode):            [  OK  ]
starting namenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-namenode-hyd-hyd-hadoop-test.arkit.co.in.out
Started Hadoop namenode:                                   [  OK  ]
starting secondarynamenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-secondarynamenode-hyd-hyd-hadoop-test.arkit.co.in.out
Started Hadoop secondarynamenode:                          [  OK  ]
# sudo -u hdfs hadoop fs -mkdir /tmp

 # sudo -u hdfs hadoop fs -chmod -R 1777 /tmp

 sudo -u hdfs hadoop fs -ls /

 root@hyd-hadoop-test:~# cat /etc/hadoop/conf.my_cluster/mapred-site.xml

 <configuration>
        <property>
          <name>mapreduce.fremework.name</name>
          <value>yarn</value>
        </property>

         <property>
          <name>mapreduce.jobhistory.address</name>
          <value>hyd-hadoop-test.arkit.co.in:10020</value>
        </property>

         <property>
          <name>mapreduce.jobhistory.webapp.address</name>
          <value>hyd-hadoop-test.arkit.co.in:19888</value>
        </property>
</configuration>

 root@hyd-hadoop-test:~# cat /etc/hadoop/conf.my_cluster/yarn-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

 <configuration>
  <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
  </property>

   <property>
    <name>yarn.nodemanager.aux-services.mapreduce_shuffle.class</name>
    <value>org.apache.hadoop.mapred.ShuffleHandler</value>
  </property>

   <property>
    <name>yarn.log-aggregation-enable</name>
    <value>true</value>
  </property>

   <property>
    <description>List of directories to store localized files in.</description>
    <name>yarn.nodemanager.local-dirs</name>
    <value>file:///var/lib/hadoop-yarn/cache/${user.name}/nm-local-dir</value>
  </property>

   <property>
    <description>Where to store container logs.</description>
    <name>yarn.nodemanager.log-dirs</name>
    <value>file:///var/log/hadoop-yarn/containers</value>
  </property>

   <property>
    <description>Where to aggregate logs to.</description>
    <name>yarn.nodemanager.remote-app-log-dir</name>
    <value>hdfs://var/log/hadoop-yarn/apps</value>
  </property>

   <property>
    <description>Classpath for typical applications.</description>
     <name>yarn.application.classpath</name>
     <value>
        $HADOOP_CONF_DIR,
        $HADOOP_COMMON_HOME/*,$HADOOP_COMMON_HOME/lib/*,
        $HADOOP_HDFS_HOME/*,$HADOOP_HDFS_HOME/lib/*,
        $HADOOP_MAPRED_HOME/*,$HADOOP_MAPRED_HOME/lib/*,
        $HADOOP_YARN_HOME/*,$HADOOP_YARN_HOME/lib/*
     </value>
  </property>
  <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
  </property>
  <property>
    <name>yarn.resourcemanager.address</name>
    <value>hyd-hadoop-test.arkit.co.in:8032</value>
  </property>
  <property>
    <name>yarn.resourcemanager.scheduler.address</name>
    <value>hyd-hadoop-test.arkit.co.in:8030</value>
  </property>
  <property>
    <name>yarn.resourcemanager.resource-tracker.address</name>
    <value>hyd-hadoop-test.arkit.co.in:8031</value>
  </property>
  <property>
    <name>yarn.resourcemanager.admin.address</name>
    <value>hyd-hadoop-test.arkit.co.in:8033</value>
  </property>
  <property>
    <name>yarn.resourcemanager.webapp.adress</name>
    <value>hyd-hadoop-test.arkit.co.in:8088</value>
   </property>
  <property>
        <name>yarn.log.aggregation-enable</name>
        <value>true</value>
   </property>

 </configuration>

 Adding Environment Variables for Haddop component
root@hyd-hadoop-test:/usr/lib/hadoop-mapreduce# export HADOOP_COMMON_HOME=/usr/lib/hadoop

 root@hyd-hadoop-test:/usr/lib/hadoop-mapreduce# export HADOOP_HDFS_HOME=/usr/lib/hadoop/hadoop-hdfs

 root@hyd-hadoop-test:/usr/lib/hadoop-mapreduce# export HADOOP_MAPRED_HOME=/usr/lib/hadoop-mapreduce

 root@hyd-hadoop-test:/usr/lib/hadoop-mapreduce# export HADOOP_YARN_HOME=/usr/lib/hadoop-yarn

 root@hyd-hadoop-test:/usr/lib/hadoop-mapreduce# export HADOOP_CONF_DIR=/usr/lib/hadoop/etc/hadoop
root@hyd-hadoop-test:~# mkdir -p /data/yarn/local
--date/time-->  08/14/18 15:02:35
root@hyd-hadoop-test:~# mkdir -p /data/yarn/logs

 root@hyd-hadoop-test:~# chown -R yarn:yarn /data/yarn/local
--date/time-->  08/14/18 15:03:11
root@hyd-hadoop-test:~# chown -R yarn:yarn /data/yarn/logs/

 root@hyd-hadoop-test:~# sudo service hadoop-yarn-resourcemanager start
starting resourcemanager, logging to /var/log/hadoop-yarn/yarn-yarn-resourcemanager-hyd-hadoop-test.arkit.co.in.out
Started Hadoop resourcemanager:                            [  OK  ]
--date/time-->  08/14/18 15:11:56
root@hyd-hadoop-test:~# sudo service hadoop-yarn-nodemanager start
starting nodemanager, logging to /var/log/hadoop-yarn/yarn-yarn-nodemanager-hyd-hadoop-test.arkit.co.in.out
Started Hadoop nodemanager:                                [  OK  ]
--date/time-->  08/14/18 15:12:10
root@hyd-hadoop-test:~# sudo service hadoop-mapreduce-historyserver start
starting historyserver, logging to /var/log/hadoop-mapreduce/mapred-mapred-historyserver-hyd-hadoop-test.arkit.co.in.out
18/08/14 15:12:17 INFO hs.JobHistoryServer: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting JobHistoryServer
STARTUP_MSG:   user = mapred
STARTUP_MSG:   host = hyd-hadoop-test/192.168.2.5
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.6.0-cdh5.15.0
STARTUP_MSG:   build = http://github.com/cloudera/hadoop -r e3cb23a1cb2b89d074171b44e71f207c3d6ffa50; compiled by 'jenkins' on 2018-05-24T11:19Z
STARTUP_MSG:   java = 1.8.0_181
Started Hadoop historyserver:                              [  OK  ]

 root@hyd-hadoop-test:~# sudo -u hdfs hadoop fs -mkdir -p /user/hdfs

 root@hyd-hadoop-test:~# sudo -u hdfs hadoop fs -mkdir -p /user/yarn

 root@hyd-hadoop-test:~# sudo -u hdfs hadoop fs -chown yarn:yarn /user/yarn

 ## Install all CDH components
yum install hive hive-metastore hive-server2 hive-hbase whirr sqoop2-server sqoop2-client sqoop spark-core spark-master spark-worker spark-history-server spark-python hbase-solr-indexer hbase-solr-doc solr-mapreduce solr-crunch solr-server pig mahout hadoop-kms hadoop-kms-server impala*  hue hadoop-httpfs oozie
Hue Configuration
# vi /etc/hadoop/conf.my_cluster/core-site.xml
<!-- Hue WebHDFS proxy user setting -->
        <property>
          <name>hadoop.proxyuser.hue.hosts</name>
          <value>*</value>
        </property>
        <property>
          <name>hadoop.proxyuser.hue.groups</name>
          <value>*</value>
        </property>
oozie configuraion
# vi /etc/oozie/conf/oozie-site.xml
    <property>
        <name>oozie.service.ProxyUserService.proxyuser.hue.hosts</name>
        <value>*</value>
    </property>

     <property>
        <name>oozie.service.ProxyUserService.proxyuser.hue.groups</name>
        <value>*</value>
    </property>
Add Server IP Address abd Port Number
# vi /etc/hue/conf.empty/hue.ini

 ## Webserver listens on this address and port 
http_host=192.168.2.5
http_port=8888

 Beeswax configuration
[beeswax]

   # Host where HiveServer2 is running.
  # If Kerberos security is enabled, use fully-qualified domain name (FQDN).
  hive_server_host=192.168.2.5

   # Port where HiveServer2 Thrift server runs on.
  hive_server_port=10000

   # Hive configuration directory, where hive-site.xml is located
  hive_conf_dir=/usr/lib/hive/conf/

   # Timeout in seconds for thrift calls to Hive service
  ## server_conn_timeout=120
[impala]
  # Host of the Impala Server (one of the Impalad)
  server_host=192.168.2.5

   # Port of the Impala Server
  server_port=21050

   # Kerberos principal
  ## impala_principal=impala/hostname.foo.com

   # Turn on/off impersonation mechanism when talking to Impala
  impersonation_enabled=False

 ### Database configuration
[[[mysql]]]
     name=mysqldb
      engine=mysql
      host=localhost
       port=3306
      user=root
       password=temp
   options={}

To Connect Database Installing Mariadb in Centos 7
yum install mariadb* -y 

 # mysql -u root -ptemp

 MariaDB [(none)]> create database mysqldb;
Query OK, 1 row affected (0.00 sec)

 MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| mysqldb            |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

 MariaDB [(none)]> exit
Bye

 root@hyd-hadoop-test:/usr/lib/hue/pids# /etc/init.d/hive-server2 status
Hive Server2 is not running                                [FAILED]
--date/time-->  08/14/18 18:04:16
root@hyd-hadoop-test:/usr/lib/hue/pids# /etc/init.d/hive-server2 restart
Stopped Hive Server2:                                      [  OK  ]
Started Hive Server2 (hive-server2):                       [  OK  ]
--date/time-->  08/14/18 18:04:25
root@hyd-hadoop-test:/usr/lib/hue/pids# systemctl enable hive-server2
hive-server2.service is not a native service, redirecting to /sbin/chkconfig.
Executing /sbin/chkconfig hive-server2 on
at 2 comments:

Bash Programming Tutorial for Beginners

Bash programming trending now a days. For most of the Linux environment automation required to have shell scripting skill set. 

Complete Video Tutorial


In this course below are the topics

S.No Topic Name
1   Difference between scripting and programming
2   What is shell scripting and it's advantages
3   PATH environment variable
4   What is sub-shell
5   Know different symbols used in shell scripting {}, [], (), *, &,^, %, $, #, @, -, =, <, >, ?, /, \, ~, `, and |
6   Different types of shells
7   Best way of writing shell scripts 
8   Writing your first script and executing
9   Quotes single, double and reverse
10  Grab User input and Print
11 Bash colors
12 script exit status
13  Variables and it's rules
14  Environment Variables, system variables and user defined variables
15  Constant variables, Local & Global variables and Special variables
16  Positional Parameters
17  Count number command line arguments $#
18  Arithmetic Operators
19  Relational Operators
20  Relational ASCII operators
21  Logical Operators
22  Assignment Operators
23 Boolean Operators
24  Redirecting Input, output and errors
25  Maths using expr command
26  Real math using bc command
27  Do mathematics using let command
28  Escape sequence 
29  if statement
30  if statement with test command
31  if-else statement 
32  if-else-if statement
33  Nested if statement
34  Case statement
35  For Loop
36  While Loop
37  Until Loop
38  Break, sleep, continue and Exit
39  Functions
40 Arrays
41  Eval command
42  Shifting parameters using shift command
43  Tput making menu's
44  Executing Multiple scripts from single script
45  $(())
46  logger logging messages to log file
47  IFS
48  Exec to send input to terminal
49  Writing CPU Usage script
50  Writing Disk Utilization script
51  Trouble shooting debugging shell scripts
52  Checking shell script errors and improvements using shellcheck.net site
53  Wrap Up / Conclusion
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