Bash Shell scripting and automation

Learn how the bash shell serves as the command line interpreter that processes user input, expands commands with wildcards and substitutions, and interfaces with the kernel via system calls.

Learn how to run a bash script on macOS using the terminal or iTerm2. Compare behavior between macOS and Linux shells and use hostname and uname to inspect systems.

Explore the Linux and Unix file system layout, including root, /bin, /home, /lib, and /proc, and learn how mounting and kernel files influence system organization.

Explore how environment variables shape command discovery and execution in bash, including PATH, export, and unset, and differences between Linux and macOS, plus spawning new shells.

Discover how to list files and directories with ls, use -l and -a for details and hidden items, understand permissions and links, and navigate with tab completion and man pages.

Explore a hands-on tour of essential Linux commands like cat, ls, and rm, with redirection, piping, and recursive deletion in Bash scripting.

Explore Unix command line basics by using who, whoami, tty, which, locate, and pwd to identify logged-in users, current identity, terminal context, and file locations through practical examples.

Learn how the cal and date commands in linux display calendars, dates, and times. Format outputs with specifiers, view utc or local times, and set the system date with privileges.

Install vim, then master vi editor basics: switch between command and insert modes, delete and yank lines, join lines, navigate with line numbers, and search and replace.

Master vi basics: save and quit with :wq or :q!, write changes, undo edits, navigate with h j k l, and manage files via vertical or horizontal splits and tabs.

Explore chmod and file permissions on Linux and Unix, mastering user, group, and others; interpret read, write, execute bits and octal values to add or remove access securely.

Explore how to change file ownership and group with chown and chgrp, set user, group, and others permissions with chmod, view users and groups with getent, and apply changes recursively.

This lecture shows how to use sort for text and numeric order, demonstrates -n and -r, and deduplicate with -u or by piping to uniq, noting ASCII ordering.

Explore file descriptors, standard input and output, and redirection in Linux/Unix, learn how to use >, >>, <, and dev/null to control command I/O and handle errors.

Explore bash redirection and pipes, including exec and file descriptors (0, 1, 2, 3), redirecting outputs to files and streaming between commands.

Explore wild cards in bash scripting, using question marks, stars, and bracket ranges to match files and patterns, with backslash escapes for spaces and special characters.

Learn to use the find command to locate files and folders with -name and case-insensitive -iname, explore wildcards, depth limits with -maxdepth, and negation with -not -name.

Master using the find command in bash scripting to locate files by name and extension, limit search depth with -maxdepth, and include hidden files, while distinguishing files from directories.

Explore using the find command to locate files by permissions, including regular files, sticky bits, and ownership, and learn why setting 777 can be risky.

Master grep usage to search with patterns, extended regex via egrep, fixed strings with -F, and count results with -c, including recursive searches and string quoting to handle spaces.

This lecture demonstrates advanced grep usage: case-insensitive matching, recursive searches, inverting matches, printing filenames with lines, and piping results to awk, sort, and unique for analysis.

Explore advanced grep usage with extended regular expressions, case-insensitive searches, word-boundary matching, and options for showing line numbers, hiding filenames, and color highlighting.

Learn to use grep to search for keywords across files with patterns, including fixed strings and pattern files, and view colored matches with before and after context via piping.

Master bash scripting basics by processing command line arguments with $#, $0, and $1, and by defining and calling shell functions with positional parameters.

Learn to use the bash while loop to run commands while a condition is true, using [ condition ]; do ...; done, with examples of a counter and sleep.

Understand the bash until loop: it runs while the condition is false and exits when it becomes true, illustrated with examples using false, sleep, and a count variable.

Explore the bash for loop and its syntax variations, from classic ranges and sequences to infinite loops, including c-like syntax, with practical file duplication examples.

Explore Bash if conditional statements and conditional expressions, including true/false evaluation, two syntax forms, else and elif branches, and comparison operators for numbers and strings, with practical examples.

Use the bash read command to capture user input into variables. Read into arrays, block until enter, and limit input with -n for a fixed number of characters.

Learn how shell exit status indicates success or failure, using zero for success and non-zero for errors, and how to capture and propagate exit codes in bash scripts.

Learn how to declare and access bash arrays, iterate over elements in multiple ways, and split input into items for efficient looping over IP lists.

Explore trap and signal handlers in Linux, showing how signals enable interprocess communication, how kill and trap differ, and how to trap SIGINT (Ctrl-C) to prevent termination.

Explore trap and signals in shell scripting, implement signal handlers with a function, handle sigint and other signals, and use exit for clean termination after cleanup.

Explore trap and signal handling in bash scripts, including exit, interrupt, and hangup signals, and observe how sleep and child processes influence cleanup and behavior across Linux and Unix variants.

learn to install ubuntu in a virtual machine on a mac, including creating a vm, allocating memory and storage, and booting from a disk image.

Learn how to use dd to copy data, create sparse files, test disk behavior with /dev/zero and block size and count, and inspect hex output with od.

Explore disk usage with df and du, learn to read human-readable output and determine free space, and use lsof and netstat to inspect open files and network connections.

Practice partitioning, formatting, and mounting a fresh disk by attaching a new disk to a test machine, listing devices, creating a partition, selecting a file system, and mounting it.

Explore nmap as a scanner for port scanning, discovering open ports and services, install and run scans on macOS, Linux, and Windows, and tune timing to balance speed and accuracy.

Learn to connect to remote linux machines using ssh and scp from mac or windows, specify ports, enable x11 forwarding with -X/-Y, and automate login with aliases and sshpass.