Course 4 - Learning Linux Shell Scripting | Episode 2: Essential Unix/Linux Command Line Utilities and Advanced Techniques

In this lesson, you’ll learn about:Text & File Management BasicsUsing cat to read, display, and concatenate files, including combining stdin and file input.Cleaning up file output (removing blank lines, showing tabs as ^I).Splitting files with split (by size or line count) and csplit (by context or text match).Creating temporary files/directories using mktemp, stored securely in /tmp.Manipulating filenames via shell operators (%, %%, #, ##) to extract extensions or URL parts.Performing bulk renaming/moving with find, mv, and rename using regex or substitution (e.g., replacing spaces).Powerful Processing & Automation Toolsfind: Recursive file search by name, regex, depth (-maxdepth, -mindepth), type, timestamps (-mtime, -ctime, -newer), size, and permissions, with pruning and efficiency optimizations.xargs: Converts stdin into command arguments, combines with find -print0 and xargs -0 to handle filenames with spaces.tr: Translates or deletes characters (e.g., case conversion, newline replacements, ROT13).sort & uniq: Sort data numerically, alphabetically, or by key; extract or detect duplicates (requires sorted input).Data Integrity & Security UtilitiesGenerating checksums using md5sum and sha1sum for file verification.Recursive checksum verification using tools like md5deep.Encrypting/decrypting files with crypt and gpg.Base64 encoding/decoding for ASCII-safe binary data conversion.Creating password hashes using openssl (e.g., salted shadow-style hashes).Terminal Environment & Workflow OptimizationRecording command sessions using script and replaying with scriptreplay for tutorials or demos.Automating input via stdin redirection (echo -e "input\n" | command) and using the expect utility for interactive prompts.Spell-checking text using aspell or the system dictionary (/usr/share/dict/words).Leveraging parallelism with background jobs (&) and wait to execute multiple tasks (like md5sum) concurrently.Core ObjectiveMastering the Unix/Linux command line as an art, combining tools (like find + xargs + grep) into powerful pipelines to solve complex automation and processing challenges efficiently.You can listen and download our episodes for free on more than 10 different platforms:https://linktr.ee/cybercode_academy