Day 5

<h2 data-start="66" data-end="137">Session Summary – Functions, System Scripts & Git Basics Timeline</h2> 00:00 – 01:02 | Previous Session Recap <ul data-start="182" data-end="314"> <li data-start="182" data-end="235"> Trainer checks practice of shell scripting commands </li> <li data-start="236" data-end="275"> Importance of practicing fundamentals </li> <li data-start="276" data-end="314"> Reminder about loops covered earlier </li> </ul> <hr data-start="316" data-end="319" /> <h2 data-start="321" data-end="352">Functions in Shell Scripting</h2> 01:02 – 02:46 | Introduction to Functions <ul data-start="400" data-end="502"> <li data-start="400" data-end="431"> Script execution line by line </li> <li data-start="432" data-end="469"> Need for functions in large scripts </li> <li data-start="470" data-end="502"> Example: backup and push to S3 </li> </ul> 02:46 – 05:41 | DRY Principle (Do Not Repeat Yourself) <ul data-start="563" data-end="667"> <li data-start="563" data-end="595"> Avoid repeating the same logic </li> <li data-start="596" data-end="635"> Encapsulating features into functions </li> <li data-start="636" data-end="667"> Calling functions when needed </li> </ul> 05:41 – 07:53 | Creating and Calling a Function <ul data-start="721" data-end="814"> <li data-start="721" data-end="754"> Function syntax in shell script </li> <li data-start="755" data-end="787"> Passing arguments to functions </li> <li data-start="788" data-end="814"> Example: greeting script </li> </ul> 07:53 – 09:37 | Function Arguments and Multiple Calls <ul data-start="874" data-end="978"> <li data-start="874" data-end="905"> Using <code data-start="882" data-end="886">$1</code> for first argument </li> <li data-start="906" data-end="939"> Calling function multiple times </li> <li data-start="940" data-end="978"> Dynamic output with different inputs </li> </ul> 09:37 – 11:31 | Return Codes in Shell Scripts <ul data-start="1030" data-end="1116"> <li data-start="1030" data-end="1054"> <code data-start="1032" data-end="1042">return 0</code> for success </li> <li data-start="1055" data-end="1079"> <code data-start="1057" data-end="1067">return 1</code> for failure </li> <li data-start="1080" data-end="1116"> Checking command status using <code data-start="1112" data-end="1116">$?</code> </li> </ul> <hr data-start="1118" data-end="1121" /> <h2 data-start="1123" data-end="1153">Arrays and Looping Concepts</h2> 11:31 – 14:41 | Arrays in Shell Script <ul data-start="1198" data-end="1276"> <li data-start="1198" data-end="1215"> Defining arrays </li> <li data-start="1216" data-end="1247"> Accessing elements with index </li> <li data-start="1248" data-end="1276"> Printing specific elements </li> </ul> 14:41 – 16:17 | Looping Through Array Elements <ul data-start="1329" data-end="1417"> <li data-start="1329" data-end="1354"> Iterating through array </li> <li data-start="1355" data-end="1391"> Printing each element sequentially </li> <li data-start="1392" data-end="1417"> Counting total elements </li> </ul> <hr data-start="1419" data-end="1422" /> <h2 data-start="1424" data-end="1447">Positional Arguments</h2> 16:17 – 20:02 | Script Arguments Explained <ul data-start="1496" data-end="1587"> <li data-start="1496" data-end="1517"> <code data-start="1498" data-end="1502">$0</code> as script name </li> <li data-start="1518" data-end="1549"> <code data-start="1520" data-end="1524">$1</code>, <code data-start="1526" data-end="1530">$2</code> as input arguments </li> <li data-start="1550" data-end="1587"> Example of passing values to script </li> </ul> 20:02 – 24:36 | Real-World Use Case of Arguments <ul data-start="1642" data-end="1757"> <li data-start="1642" data-end="1674"> Multiple AWS accounts scenario </li> <li data-start="1675" data-end="1715"> One script handling different accounts </li> <li data-start="1716" data-end="1757"> Using arguments to make scripts dynamic </li> </ul> <hr data-start="1759" data-end="1762" /> <h2 data-start="1764" data-end="1789">Exit Codes & Debugging</h2> 24:36 – 25:59 | Common Exit Codes <ul data-start="1829" data-end="1903"> <li data-start="1829" data-end="1844"> <code data-start="1831" data-end="1834">0</code> = success </li> <li data-start="1845" data-end="1866"> <code data-start="1847" data-end="1850">1</code> = general error </li> <li data-start="1867" data-end="1903"> Importance of handling exit status </li> </ul> 25:59 – 26:22 | Script Debugging <ul data-start="1942" data-end="2037"> <li data-start="1942" data-end="1977"> Enabling debug mode: <ul data-start="1967" data-end="1977"> <li data-start="1967" data-end="1977"> <code data-start="1969" data-end="1977">set -x</code> </li> </ul> </li> <li data-start="1978" data-end="2009"> Disabling debug: <ul data-start="1999" data-end="2009"> <li data-start="1999" data-end="2009"> <code data-start="2001" data-end="2009">set +x</code> </li> </ul> </li> <li data-start="2010" data-end="2037"> Use case in large scripts </li> </ul> <hr data-start="2039" data-end="2042" /> <h2 data-start="2044" data-end="2078">Practical Shell Script Examples</h2> 26:22 – 28:20 | System Report Script Overview <ul data-start="2130" data-end="2218"> <li data-start="2130" data-end="2166"> Script for system health reporting </li> <li data-start="2167" data-end="2190"> Automation using cron </li> <li data-start="2191" data-end="2218"> Sending reports via email </li> </ul> 28:20 – 29:27 | Date and Uptime Commands <ul data-start="2265" data-end="2328"> <li data-start="2265" data-end="2287"> Using <code data-start="2273" data-end="2279">date</code> command </li> <li data-start="2288" data-end="2328"> Using <code data-start="2296" data-end="2304">uptime</code> for system running time </li> </ul> 29:27 – 31:14 | Memory Monitoring with <code data-start="2371" data-end="2377">free</code> and <code data-start="2382" data-end="2387">awk</code> <ul data-start="2390" data-end="2464"> <li data-start="2390" data-end="2407"> Using <code data-start="2398" data-end="2407">free -h</code> </li> <li data-start="2408" data-end="2438"> Extracting values with <code data-start="2433" data-end="2438">awk</code> </li> <li data-start="2439" data-end="2464"> Text processing concept </li> </ul> 31:14 – 34:23 | Disk Usage with <code data-start="2500" data-end="2504">df</code> and <code data-start="2509" data-end="2514">awk</code> <ul data-start="2517" data-end="2600"> <li data-start="2517" data-end="2532"> Using <code data-start="2525" data-end="2532">df -h</code> </li> <li data-start="2533" data-end="2570"> Selecting specific rows and columns </li> <li data-start="2571" data-end="2600"> Understanding <code data-start="2587" data-end="2591">NR</code> in <code data-start="2595" data-end="2600">awk</code> </li> </ul> 34:23 – 36:12 | Process Monitoring Script <ul data-start="2648" data-end="2714"> <li data-start="2648" data-end="2664"> Using <code data-start="2656" data-end="2664">ps aux</code> </li> <li data-start="2665" data-end="2690"> Sorting by memory usage </li> <li data-start="2691" data-end="2714"> Showing top processes </li> </ul> <hr data-start="2716" data-end="2719" /> <h2 data-start="2721" data-end="2750">Automation Script Examples</h2> 36:12 – 37:31 | Backup Automation Script <ul data-start="2797" data-end="2891"> <li data-start="2797" data-end="2827"> Checking directory existence </li> <li data-start="2828" data-end="2859"> Creating directory if missing </li> <li data-start="2860" data-end="2891"> Compressing files using <code data-start="2886" data-end="2891">tar</code> </li> </ul> 37:31 – 40:10 | User Management Automation Script <ul data-start="2947" data-end="3069"> <li data-start="2947" data-end="2982"> Creating multiple users from file </li> <li data-start="2983" data-end="3009"> Checking root privileges </li> <li data-start="3010" data-end="3035"> Skipping existing users </li> <li data-start="3036" data-end="3069"> Setting passwords automatically </li> </ul> <hr data-start="3071" data-end="3074" /> <h2 data-start="3076" data-end="3096">Transition to Git</h2> 40:10 – 41:53 | Linux Topics Completed & Git Introduction <ul data-start="3160" data-end="3268"> <li data-start="3160" data-end="3208"> Completion of basic Linux and scripting topics </li> <li data-start="3209" data-end="3235"> Transition to Git module </li> <li data-start="3236" data-end="3268"> Question about Git familiarity </li> </ul> <hr data-start="3270" data-end="3273" /> <h2 data-start="3275" data-end="3294">Git Fundamentals</h2> 41:53 – 44:27 | What is Git and Why It’s Needed <ul data-start="3348" data-end="3441"> <li data-start="3348" data-end="3382"> Collaboration between developers </li> <li data-start="3383" data-end="3410"> Tracking changes in files </li> <li data-start="3411" data-end="3441"> Identifying who made changes </li> </ul> 44:27 – 46:20 | Git Workflow Overview <ul data-start="3485" data-end="3566"> <li data-start="3485" data-end="3504"> Working directory </li> <li data-start="3505" data-end="3519"> Staging area </li> <li data-start="3520" data-end="3538"> Local repository </li> <li data-start="3539" data-end="3566"> Remote repository (intro) </li> </ul> 46:20 – 48:49 | Initializing a Git Repository <ul data-start="3618" data-end="3683"> <li data-start="3618" data-end="3630"> <code data-start="3620" data-end="3630">git init</code> </li> <li data-start="3631" data-end="3647"> Creating files </li> <li data-start="3648" data-end="3683"> Checking status with <code data-start="3671" data-end="3683">git status</code> </li> </ul> 48:49 – 49:44 | Staging and Committing Changes <ul data-start="3736" data-end="3802"> <li data-start="3736" data-end="3747"> <code data-start="3738" data-end="3747">git add</code> </li> <li data-start="3748" data-end="3765"> <code data-start="3750" data-end="3765">git commit -m</code> </li> <li data-start="3766" data-end="3802"> Moving changes to local repository </li> </ul> 49:44 – 52:21 | Tracking Changes and Commit History <ul data-start="3860" data-end="3934"> <li data-start="3860" data-end="3877"> Modifying files </li> <li data-start="3878" data-end="3894"> Viewing status </li> <li data-start="3895" data-end="3934"> Using <code data-start="3903" data-end="3912">git log</code> to see commit history </li> </ul> <hr data-start="3936" data-end="3939" /> <h2 data-start="3941" data-end="3959">Session Wrap-Up</h2> 52:21 – End | Next Steps & Practice Instructions <ul data-start="4014" data-end="4207"> <li data-start="4014" data-end="4152"> More Git topics in next session: <ul data-start="4051" data-end="4152"> <li data-start="4051" data-end="4065"> Remote repos </li> <li data-start="4068" data-end="4090"> Push, pull, checkout </li> <li data-start="4093" data-end="4104"> Branching </li> <li data-start="4107" data-end="4125"> Rebase and merge </li> <li data-start="4128" data-end="4152"> GitHub Actions (CI/CD) </li> </ul> </li> <li data-start="4153" data-end="4189"> Practice shell scripting and <code data-start="4184" data-end="4189">awk</code> </li> <li data-start="4190" data-end="4207"> Session closing </li> </ul>

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