These Unix / Linux Programming Notes (BCA 5th Semester) are arranged in a clear and easy-to-follow format to make important concepts easier to study and revise. The explanations focus on the topics students are expected to understand for university examinations while also connecting the concepts with practical programming and command-line usage.
The subject is particularly useful for students interested in system programming, Linux administration, server management, DevOps, networking, cybersecurity, and software development. A strong understanding of Unix/Linux programming helps students become comfortable with command-line tools and operating-system-level concepts, providing a valuable foundation for working with modern computing environments.
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Course Units
Unit 1: Introduction to Unix/Linux & File System
Topics Covered: History and evolution of Unix/Linux, Bell Labs, BSD, System V and POSIX, Linux and GNU project, major Linux distributions, Unix philosophy, Linux architecture, types of shells, login process, virtual terminals, Linux file system hierarchy, file types and file systems, inodes, hard and symbolic links, mounting and unmounting, /etc/fstab, and df and du commands.
Unit 2: Linux Commands
Topics Covered: File and directory management commands, file searching and information commands, file content and comparison commands, text processing using grep, sed, awk, cut, sort, uniq, tr, paste, join, tee and xargs, regular text processing operations, archiving and compression using tar, gzip, bzip2, xz, zip and unzip.
Unit 3: File Permissions & Process Management
Topics Covered: Linux file permissions, read, write and execute permissions, owner, group and others, chmod, chown, chgrp and umask, special permissions including SUID, SGID and Sticky Bit, Access Control Lists, process concepts and states, PID and PPID, process monitoring, foreground and background processes, process signals, process priority, nice, renice, nohup, process substitution, and the /proc file system.
Unit 4: Shell Scripting
Topics Covered: Shell scripting fundamentals, shebang, script execution, variables, special and positional parameters, quoting and command substitution, arithmetic and string operations, conditional statements, if-else and case, file, string and arithmetic tests, for, while, until and select loops, loop control, functions, function arguments and return values, local variables, Bash indexed and associative arrays, array operations, and here documents (heredoc).
Unit 5: Advanced Shell Scripting & System Administration
Topics Covered: Advanced sed and awk scripting, BEGIN and END blocks, user-defined awk functions, printf, advanced regular expressions and POSIX character classes, process automation using cron and at, crontab scheduling, system logging, syslog, /var/log/, logger and logrotate, user and group management, package management using APT, DPKG, YUM, DNF and RPM, network configuration and utilities, disk management, file system checking and mounting, system monitoring, init and systemd, runlevels, systemctl, service unit files, and systemd targets.
What is Unix / Linux Programming?
Unix / Linux Programming is a computer science subject that focuses on understanding Unix and Linux operating systems, using command-line tools, managing system resources, and developing shell scripts. Unix introduced important operating system concepts such as the Unix philosophy, hierarchical file systems, process management, permissions, and the use of small utilities that can be combined through pipes. Linux follows many of these principles and provides a powerful environment for programming, system administration, networking, and server management.
The subject begins with the history and architecture of Unix/Linux, different Linux distributions and shells, the Linux file system hierarchy, file types, inodes, links, and mounting. It then covers essential commands for managing files, processing text, searching data, and creating compressed archives.
Major areas covered in this subject include:
Unix/Linux Fundamentals – History, architecture, distributions, shells, terminals, and login process
Linux File System – FHS directories, file types, inodes, links, mounting,
df, andduLinux Commands – File management, text processing,
grep,sed,awk, searching, archiving, and compressionFile Permissions –
chmod,chown,chgrp,umask, SUID, SGID, Sticky Bit, and ACLProcess Management – Processes, PIDs, signals, foreground/background execution, priorities, and
/procShell Scripting – Variables, operators, conditions, loops, functions, arrays, quoting, and command substitution
Bash Programming – Script execution, positional parameters, arithmetic, string operations, and here documents
In simple terms, Unix/Linux Programming develops the skills needed to work efficiently with Linux systems and automate tasks through powerful command-line tools and shell scripts.