About Linux

• VIM
  • Opening Files
  • Edit/Command Mode
  • Writing and Quit

Linux Details

• Linux Distributions
  • Alpine
  • Debian
  • Ubuntu
• Manuals
  • Commands
  • References
• Directory Structure
  • Directory Structure
  • Root Directory
• Files and Directories
  • Change Directory
  • List Files and Directories
  • Files
  • Directories
  • Files and Directories
• Permissions
  • Understanding Permissions
  • Changing Permissions
  • UMASK
  • Sticky bit
  • ACL
• Packages
  • Paths
  • Commands
• Environment Variables
  • Paths
  • Variables
  • PS1
  • Commands
• Users and groups
  • Paths
  • Etc Passwd
  • Etc Shadow
  • Etc Group
  • useradd vs. adduser
  • Commands
• Shell
  • Shells
  • Paths
  • Keyboard Shortcuts
  • Debugging
  • Commands
• Crontab
  • Files
  • Directories
  • Output Redirect
  • Commands
  • Variables
  • Syntax
  • Time
  • Recurrence
  • Example
  • Use Case - 0x01
  • Use Case - 0x02
  • Use Case - 0x03
  • Use Case - 0x04
• Logs
  • Files
  • Commands
• Security
  • Random
  • /dev/random vs /dev/urandom
  • Commands
  • References
• SSH
  • Generate Key
  • Connect
  • Authorized Keys
  • Known Hosts
  • Port Forwarding
  • Config and Host Aliases
  • SSHd
• Locale
  • Paths
  • Variables
  • Commands
• Date
  • Paths
  • Date Formatting
  • Date
  • Unix Timestamp
  • Commands
• Filesystem
  • Disk
  • Partitioning
  • File Systems
  • Integrity
  • Mounting
• Processes
  • PID
  • Problems
  • Killing
  • Keyboard Shortcuts
  • Priorities
  • Commands
• Signals
• Boot
  • Modes
  • GRUB
  • Files
  • Directories
  • Commands
• Services
  • Runlevel
  • Initialization
  • Configuration
  • Management
  • Commands
• Networking
  • IPv4 vs IPv6
  • Networks
  • Paths
  • Built-in
  • Additional
• Devices
  • Files
  • Directories
  • Devices
  • Commands
• Kernel
  • Commands
• X Window System
  • Paths
  • Desktop Manager
  • Desktop Environment
  • Commands
• Compression
  • Commands
• Backup

Shell Programming

• About
  • Variables
  • Symbols
  • Control Flow
  • Commands
• Interpreter
  • Configuration files
  • Locale
  • Autocompletion
  • New lines
  • #!/bin/bash
  • bash -x
  • Comments
  • Inline comments
• Variables
  • single quotes
  • double quotes
  • Script arguments
• Conditionals
  • if
  • if and else
  • Short version - && and ||
  • Case (A.K.A. switch)
• Loops
  • For
  • While
  • Until
• Redirection Commands
  • Descriptors
  • Redirection
  • References
• Pipe
  • Pipe - |
  • awk
  • sed
  • sort
  • uniq
• Stdout and Stderr
• > and >>
• < and <<
• 1 > /dev/null
• 2 > &1
• Arrays
  • Declaration
  • Storing values
  • Getting values
  • Metadata
  • Destruction
• Network
  • wget
  • curl
• Parameter expansion
  • Simple usage
  • Indirection
  • Case modification
  • Variable name expansion
  • Substring removal (also for filename manipulation!)
  • Search and replace
  • String length
  • Substring expansion
  • Use a default value
  • Assign a default value
  • Use an alternate value
  • Display error if null or unset
• Regular Expressions
  • Grep
  • Egrep
• Multiprocessing
  • Process - ...&
  • Subprocess - $(...)
  • Return codes from last command $?

Summary

• Commands
• Shell Scripting