111.Course: Advanced Shell Scripting using Bash
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Session
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Module Focus
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Topics Covered
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1
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Level 1 Recap & Advanced Intro
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Quick review of Level 1 (loops, if/else, permissions). Introduction to the Bash environment, startup files (.bashrc, .bash_profile), and script execution environments.
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2
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Mastering Regular Expressions
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Basic vs. Extended Regular Expressions (BRE vs. ERE). Pattern matching, anchors, character classes, and capturing groups for text extraction.
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3
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Text Processing with sed
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Using the Stream Editor. In-place editing, advanced substitution, addressing specific lines, and multi-command execution.
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4
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Data Extraction with awk
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The awk programming model. Field separators, built-in variables (NR, NF), writing awk scripts for log parsing and report generation.
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5
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Advanced I/O & Redirection
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File descriptors (0, 1, 2 and custom ones). Here Documents (<()).
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6
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Process & Job Management
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Foreground/background jobs (&, fg, bg). Using wait for parallel processing. Managing detached processes with nohup and disown.
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7
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Signal Handling with trap
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Understanding Linux signals (SIGINT, SIGTERM). Using the trap command to clean up temporary files and handle graceful script exits.
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8
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Robust Error Handling
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Writing bulletproof scripts using set -e, set -u, set -x, and set -o pipefail. Creating custom error-handling and logging functions.
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9
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Subshells & Variable Scope
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How subshells work and their performance impact. Exporting variables, scoping with local, and understanding environment inheritance.
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10
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Networking & APIs in Bash
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Making HTTP requests with curl. Parsing JSON responses in Bash using jq. Interacting with REST APIs for system automation.
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11
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Interactive & GUI Scripts
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Creating user-friendly menus using the select command. Building terminal-based graphical dialogs using whiptail or dialog.
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12
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Security & Best Practices
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Safe handling of temporary files (mktemp). Avoiding eval. Quoting pitfalls. Using ShellCheck to lint and secure scripts.
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13
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Professional CLI Interfaces with getopts
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Moving beyond $1, $2. Using getopts to parse standard UNIX flags (e.g., -h, -v, -f filename). Handling required and optional arguments elegantly.
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14
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Advanced Bulk File Operations (find & xargs)
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Mastering find predicates (time, size, permissions). Safe execution on files with spaces using -print0 and xargs -0. Batch processing techniques.
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15
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Remote Automation & SSH
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Executing scripts and commands on remote servers via ssh. Automating file transfers with scp and rsync. Managing SSH keys for passwordless script execution.
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