{"id":48,"date":"2026-10-14T05:51:03","date_gmt":"2026-10-14T05:51:03","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/2015\/06\/17\/shell-scripting-bash-training-2\/"},"modified":"2026-10-14T05:51:03","modified_gmt":"2026-10-14T05:51:03","slug":"shell-scripting-bash-training-2","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/shell-scripting-bash-training-2\/","title":{"rendered":"Shell Scripting (Bash) Training Roadmap: From First Script to Automation"},"content":{"rendered":"\n

Originally published on 2015-06-17; fully revised and updated.<\/em><\/p>\n\n\n\n

This page is a structured roadmap for engineers and administrators who want to learn Bash scripting for day-to-day DevOps work. You will see the full learning sequence, practical commands, and how to move from simple scripts to production-friendly automation.<\/p>\n\n\n\n

\"Shell<\/figure>\n\n\n\n

Original registration link from the source post: DevOps Training Registration<\/a>.<\/p>\n\n\n\n

What this Bash training covers<\/h2>\n\n\n\n

The original post provided a module list. Reorganized into a modern sequence, the course covers Linux shell foundations, Git basics, core Bash syntax, control flow, parameters, functions, string operations, and operational execution patterns such as background jobs and cron.<\/p>\n\n\n\n

  • Shell and Linux fundamentals<\/li>
  • Git fundamentals for script versioning<\/li>
  • Creating and running shell scripts safely<\/li>
  • Variables, input, output, and redirection<\/li>
  • Conditionals, loops, and control statements<\/li>
  • Functions and reusable script design<\/li>
  • Parameters, shift<\/code>, and getopts<\/code><\/li>
  • String handling, pattern matching, and arrays<\/li>
  • Execution modes: foreground, background, nohup, cron<\/li><\/ul>\n\n\n\n

    Learning flow from basics to automation<\/h2>\n\n\n\n

    Use this sequence to avoid common learning gaps. Each stage builds directly on the previous one.<\/p>\n\n\n\n

    \nflowchart TD\n    A[Linux shell basics] --> B[Git fundamentals]\n    B --> C[First Bash scripts]\n    C --> D[Variables and input output]\n    D --> E[If tests and return codes]\n    E --> F[Loops and case statements]\n    F --> G[Parameters and getopts]\n    G --> H[Functions strings arrays]\n    H --> I[Run with nohup cron and exec]\n    I --> J[Debug harden and maintain]\n<\/pre>\n\n\n\n
    Curriculum breakdown by module<\/h2>\n\n\n\n
    Foundation modules<\/h3>\n\n\n\n
    • Why shell scripting and where it fits in DevOps workflows<\/li>
    • Linux internals relevant to scripting<\/li>
    • Prerequisites and terminal habits<\/li>
    • Git setup, basic operations, and GitHub usage<\/li><\/ul>\n\n\n\n
      Core Bash scripting modules<\/h3>\n\n\n\n
      • Script creation, shebang usage, and naming conventions<\/li>
      • Variables, quoting, and reading user input<\/li>
      • If\/then\/else logic, conditional expressions, and arithmetic tests<\/li>
      • Input\/output with echo<\/code>, printf<\/code>, and stream redirection<\/li>
      • Control flow with while<\/code>, until<\/code>, for<\/code>, break<\/code>, continue<\/code>, and case<\/code><\/li><\/ul>\n\n\n\n
        Advanced and operational modules<\/h3>\n\n\n\n
        • Integer variables, arithmetic expressions, readonly\/exported variables, arrays<\/li>
        • Handling parameters with special variables, shift<\/code>, and getopts<\/code><\/li>
        • Functions and reusable script structure<\/li>
        • String slicing, search\/replace, default values, and regex patterns<\/li>
        • Execution options including background runs, nohup<\/code>, exec<\/code>, at<\/code>, and cron<\/code><\/li><\/ul>\n\n\n\n
          Hands-on Bash examples to practice<\/h2>\n\n\n\n
          These examples match the topics in the curriculum and are suitable for lab practice.<\/p>\n\n\n
          #!\/usr\/bin\/env bash<\/span>\nset -euo pipefail\n\nnote_file=\"${HOME}\/notes.txt\"<\/span>\nread -r -p \"Enter note: \"<\/span> note\nprintf \"%s | %s\\n\"<\/span> \"$(date +%F\\ %T)\"<\/span> \"$note\"<\/span> >> \"$note_file\"<\/span>\necho<\/span> \"Saved to $note_file\"<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n
          #!\/usr\/bin\/env bash<\/span>\nset -euo pipefail\n\nlog_file=\"${1:-app.log}\"<\/span>\n\nif<\/span> [[ -f \"$log_file\"<\/span> ]]; then\n  if<\/span> grep -q \"ERROR\"<\/span> \"$log_file\"<\/span>; then\n    echo<\/span> \"Errors found in $log_file\"<\/span>\n  else<\/span>\n    echo<\/span> \"No errors found in $log_file\"<\/span>\n  fi\nelse<\/span>\n  echo<\/span> \"File not found: $log_file\"<\/span> >&2<\/span>\n  exit<\/span> 1<\/span>\nfi<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n
          #!\/usr\/bin\/env bash<\/span>\nset -euo pipefail\n\nfile=\"\"<\/span>\ncount=1<\/span>\n\nwhile<\/span> getopts \":f:n:h\"<\/span> opt; do<\/span>\n  case<\/span> \"$opt\"<\/span> in\n    f) file=\"$OPTARG\"<\/span> ;;\n    n) count=\"$OPTARG\"<\/span> ;;\n    h)\n      echo<\/span> \"Usage: $0 -f FILE [-n COUNT]\"<\/span>\n      exit<\/span> 0<\/span>\n      ;;\n    :)\n      echo<\/span> \"Option -$OPTARG requires an argument\"<\/span> >&2<\/span>\n      exit<\/span> 1<\/span>\n      ;;\n    \\?)\n      echo<\/span> \"Invalid option: -$OPTARG\"<\/span> >&2<\/span>\n      exit<\/span> 1<\/span>\n      ;;\n  esac\ndone\n\nshift \"$((OPTIND - 1))\"<\/span>\necho<\/span> \"file=$file count=$count remaining_args=$*\"<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
          Ways to run scripts in development and operations<\/h2>\n\n\n\n
          Method<\/th>Best for<\/th>Caveat<\/th>Example<\/th><\/tr><\/thead>
          Direct execution<\/td>Normal script usage with shebang<\/td>Needs execute permission<\/td>.\/script.sh<\/code><\/td><\/tr>
          Invoke with bash<\/td>Quick tests without chmod<\/td>May bypass intended interpreter in shebang<\/td>bash script.sh<\/code><\/td><\/tr>
          source (dot command)<\/td>Loading functions or environment variables into current shell<\/td>Changes affect current shell session<\/td>source .\/env.sh<\/code><\/td><\/tr>
          nohup and background<\/td>Long tasks that should continue after logout<\/td>No built-in scheduling\/retry policy<\/td>nohup .\/job.sh > job.log 2>&1 &<\/code><\/td><\/tr>
          cron scheduling<\/td>Recurring automation<\/td>Runs with minimal environment<\/td>0 2 * * * \/opt\/scripts\/backup.sh<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
          chmod +x script.sh\n.\/script.sh\nbash script.sh\nsource .\/env.sh\nnohup .\/job.sh > job.log 2>&1 &\ncrontab -e<\/code><\/span><\/pre>\n\n\n
          Best practices and common pitfalls<\/h2>\n\n\n\n
          • Start scripts with #!\/usr\/bin\/env bash<\/code> and use strict mode (set -euo pipefail<\/code>) when appropriate.<\/li>
          • Quote variables to prevent word-splitting and globbing bugs.<\/li>
          • Check exit codes and handle failures explicitly.<\/li>
          • Use shellcheck<\/code> during development to catch common issues early.<\/li>
          • For cron jobs, set required environment variables inside the script.<\/li>
          • Keep scripts in Git and review changes like application code.<\/li><\/ul>\n\n\n\n
            This revised page preserves the original training intent while giving you a practical, execution-focused path for learning and applying Bash scripting in DevOps environments.<\/p>\n","protected":false},"excerpt":{"rendered":"
            This revised Bash training guide turns the original topic list into a practical learning roadmap. It shows what to study, how topics connect, and which commands to practice for real-world scripting.<\/p>\n","protected":false},"author":1,"featured_media":3459,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[8],"tags":[99,137,1675,1679,140,91,101,103,102,95,93,100,97,94,92,139,138,1676,136,1678,1677,1674,105,96,104,98],"class_list":["post-48","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-training","tag-bangalore","tag-bash","tag-bash-course","tag-bash-scripting-course","tag-bash-training","tag-build","tag-continuous-integration","tag-courses","tag-delivery","tag-devops","tag-engineer","tag-hyderabad","tag-india","tag-online","tag-release","tag-scripting","tag-shell","tag-shell-course","tag-shell-scripting","tag-shell-scripting-course","tag-shell-scripting-training","tag-shell-training","tag-trainer","tag-training","tag-tutorials","tag-usa"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=48"}],"version-history":[{"count":3,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48\/revisions"}],"predecessor-version":[{"id":79287,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48\/revisions\/79287"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/3459"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=48"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=48"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=48"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}