Bash Shell scripting and automation

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 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.

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.

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 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 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 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 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.

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.