Bash Shell Scripting: Automate the Boring Stuff with Bash

Learn what bash is and how bash scripting automates tasks by combining commands into scripts, enabling system administration, file manipulation, and process automation on Linux.

Learn to write robust bash scripts by applying best practices: meaningful variable names, comments, modular code, environment variables, documentation, and version control, with a proper shebang and executable structure.

Explore bash variables, including shell and environment variables, arrays with zero-based indexing, and printing with echo; learn how to declare, access, update, and unset elements.

Master bash arrays, a variable holding multiple values, using zero-based indices to access, print, add, delete, and take ranges of elements.

Master bash operators to perform arithmetic, string manipulation, comparisons, and logical tests. Learn file testing and assignment operators through practical syntax and examples.

Learn how the and and or operators control command flow in Bash by evaluating exit statuses. Use them in conditional statements and command chaining.

Explore bash shell expansion, including wild card expansion, tilde expansion, and brace expansion. Learn command substitution, arithmetic expansion, and parameter expansion to manipulate files and variables.

Learn how loops drive automation in bash: use while and for loops, structure scripts with a shebang and metadata, and iterate arrays to print values while checking conditions.

Explore how conditional statements drive control flow in Bash scripting, using if, elif, and else to execute code blocks based on variable comparisons.

Learn how to capture user input in bash using the read command, including prompts, input length limits, timeouts, and hiding password entries, with practical examples.

Explore how to use the bash select command to build a menu-based interface, covering its syntax, for loop-like behavior, the PS3 prompt, and breaking to exit.

Discover how exit status drives bash scripts by checking the last command's success with $?, where zero means success and non-zero signals failure, guiding if-else decisions.

Learn to build a bash script that collects system information on Linux, including host name, CPU, memory, and disk usage, using command substitution and grep, awk, and cut.

Learn to create a bash script that checks website availability using a for loop and ping, iterating over an array of domains and reporting each site's status.

Learn to build a bash script that checks whether a given number is odd or even using a function, an argument, and modulus with an if-else.

Learn to check disk usage by parsing df -h output, looping through each line, and reporting file systems whose usage exceeds a threshold.

Automate server-to-server scp with a bash script to transfer files from the MDB server to the PDB server, using passwordless ssh for unattended transfers.

Learn to calculate age with a bash script by extracting year, month, and day from dates using the date command, supporting birthdates via command-line arguments and interactive prompts.

Learn to extract mobile numbers and emails from documents using bash scripts. Use regular expressions with grep to capture data and save results.

learn to build a dynamic calculator in bash using bc and arithmetic expansion to perform add, subtract, multiply, and divide with fractional output, controlled by script arguments and scale.

Launch an employee survey project using a bash script with the select command to build a menu-driven interface, capture name, age, country, and color, and save a survey report.

Learn to back up and restore a Postgres database with bash scripting, using pgdump and SQL commands to automate database maintenance.