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Linux Beginner

What is Chmod?

A command to change file and directory access permissions using numeric or symbolic notation.

Chmod modifies read (r=4), write (w=2), and execute (x=1) permissions for owner, group, and others. Numeric: chmod 755 file (owner=rwx, group=rx, others=rx). Symbolic: chmod u+x file (add execute for owner).

Common permissions: 644 (files — owner rw, others read), 755 (directories/scripts — owner rwx, others rx), 600 (private files — owner only). The -R flag applies recursively. Understanding permissions is fundamental to Linux security.

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The PATH variable that tells the shell which directories to search when looking for executable commands.
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Rsync
A fast, versatile file synchronization tool that efficiently transfers and syncs files between local and remote systems.
Crontab Syntax
The time specification format used in cron job scheduling, with five fields defining minute, hour, day of month, month, and day of week.
Procfs (/proc)
A virtual filesystem in Linux that provides an interface to kernel data structures, exposing process and system information as files.
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