Contents

• Getting started
  • Getting started with Bash
  • Hello World
  • Hello World Using Variables
  • Hello World with User Input
  • Importance of Quoting in Strings
  • Viewing information for Bash built-ins
  • Hello World in Debug mode
  • Handling Named Arguments
• Using trap to react to signals and system events
  • Using trap to react to signals and system events
  • Introduction clean up temporary files
  • Catching SIGINT or Ctl C
  • Accumulate a list of trap work to run at exit.
  • Killing Child Processes on Exit
  • react on change of terminals window size
• Listing files
  • Listing Files
  • List Files in a Long Listing Format
  • List the Ten Most Recently Modified Files
  • List All Files Including Dotfiles
  • List Files
  • List Files Without Using ls
  • List Files in a Tree-Like Format
  • List Files Sorted by Size
• Aliasing
  • Aliasing
  • Bypass an alias
  • Create an Alias
  • Remove an alias
  • List all Aliases
  • Expand alias
  • The BASH ALIASES is an internal bash assoc array
• Jobs and processes
  • Jobs and Processes
  • Job handling
  • Check which process running on specific port
  • Disowning background job
  • List Current Jobs
  • List all processes
  • Finding information about a running process
• Redirection
  • Redirection
  • Redirecting standard output
  • Append vs Truncate
  • Redirecting both STDOUT and STDERR
  • Using named pipes
  • Redirection to network addresses
  • Redirecting multiple commands to the same file
  • Print error messages to stderr
  • STDIN STDOUT and STDERR explained
  • Redirecting STDIN
  • Redirecting STDERR
• Control structures
  • Control Structures
  • Conditional execution of command lists
  • If statement
  • Looping over an array
  • Using For Loop to List Iterate Over Numbers
  • Loop break
  • For Loop with C-style syntax
  • continue and break
  • While Loop
  • Switch statement with case
  • For Loop without a list-of-words parameter
  • Until Loop
  • For Loop
• Using cat
  • Using cat
  • Concatenate files
  • Printing the Contents of a File
  • Write to a file
  • Display line numbers with output
  • Read from standard input
  • Show non printable characters
  • Concatenate gzipped files
• Arrays
  • Arrays
  • Array Assignments
  • Accessing Array Elements
  • Array Modification
  • Array Length
  • Array Iteration
  • Associative Arrays
  • Looping through an array
  • Destroy Delete or Unset an Array
  • List of initialized indexes
  • Array from string
  • Reading an entire file into an array
  • Array insert function
• Functions
  • Functions
  • Functions with arguments
  • Simple Function
  • Handling flags and optional parameters
  • Return value from a function
  • The exit code of a function is the exit code of its last command
  • Print the function definition
  • A function that accepts named parameters
• Bash Parameter Expansion
  • Bash Parameter Expansion
  • Modifying the case of alphabetic characters
  • Length of parameter
  • Replace pattern in string
  • Substrings and subarrays
  • Delete a pattern from the beginning of a string
  • Parameter indirection
  • Default value substitution
  • Delete a pattern from the end of a string
  • Parameter expansion and filenames
  • Error if variable is empty or unset
  • Munging during expansion
• Sourcing
  • Sourcing
  • Sourcing a file
  • Sourcing a virtual environment
• Find
  • Find
  • Searching for a file by name or extension
  • Executing commands against a found file
  • Finding file by access modification time
  • Finding files according to size
  • Filter the path
  • Finding files by type
  • Finding files by specific extension
• Here documents and here strings
  • Here documents and here strings
  • Execute command with here document
  • Indenting here documents
  • Here strings
  • Create a file
  • Run several commands with sudo
  • Limit Strings
• Quoting
  • Quoting
  • Double quotes for variable and command substitution
  • Difference between double quote and single quote
  • Newlines and control characters
  • Quoting literal text
• Conditional Expressions
  • Conditional Expressions
  • File type tests
  • String comparison and matching
  • Test on exit status of a command
  • File comparison
  • File access tests
  • Numerical comparisons
  • One liner test
• Scripting with parameters
  • Scripting with Parameters
  • Multiple Parameter Parsing
  • Accessing Parameters
  • Argument parsing using a for loop
  • Wrapper script
  • Split string into an array in Bash
• History substitutions
  • Bash history substitutions
  • Quick Reference
  • Repeat previous command with sudo
  • Search in the command history by pattern
  • Switch to newly created directory with N
  • Using
  • Repeat the previous command with a substitution
• Math
  • Math
  • Math using dc
  • Math using bc
  • Math using bash capabilities
  • Math using expr
• Scoping
  • Scoping
  • Dynamic scoping in action
• Process substitution
  • Process substitution
  • Compare two files from the web
  • Feed a while loop with the output of a command
  • Concatenating files
  • With paste command
  • Stream a file through multiple programs at once
  • To avoid usage of a sub-shell
• Programmable completion
  • Programmable completion
  • Simple completion using function
  • Simple completion for options and filenames
• Customizing PS1
  • Customizing PS1
  • Colorize and customize terminal prompt
  • Show git branch name in terminal prompt
  • Change PS1 prompt
  • Show a git branch using PROMPT COMMAND
  • Show time in terminal prompt
  • Show previous command return status and time
• Brace Expansion
  • Brace Expansion
  • Modifying filename extension
  • Create directories to group files by month and year
  • Create a backup of dotfiles
  • Use increments
  • Using brace expansion to create lists
  • Make Multiple Directories with Sub-Directories
• Bash Arithmetic
  • Bash Arithmetic
  • Simple arithmetic with
  • Arithmetic command
  • Simple arithmetic with expr
• getopts smart positional-parameter parsing
  • getopts smart positional-parameter parsing
  • pingnmap
• Debugging
  • Debugging
  • Checking the syntax of a script with -n
  • Debugging usigh bashdb
  • Debugging a bash script with -x
• Pitfalls
  • Pitfalls
  • Whitespace When Assigning Variables
  • Failed commands do not stop script execution
  • Missing The Last Line in a File
• Script shebang
  • Script shebang
  • Env shebang
  • Direct shebang
  • Other shebangs
• Pattern matching and regular expressions
  • Pattern matching and regular expressions
  • Behaviour when a glob does not match anything
  • Check if a string matches a regular expression
  • Get captured groups from a regex match against a string
  • The glob
  • The glob
  • Case insensitive matching
  • The glob
  • Extended globbing
  • Regex matching
  • The glob
  • Matching hidden files
• Keyboard shortcuts
  • Keyboard shortcuts
  • Editing Shortcuts
  • Recall Shortcuts
  • Job Control
  • Macros
  • Custome Key Bindings
• Change shell
  • Change shell
  • Find the current shell
  • Change the shell
  • List available shells
• Copying with cp
  • Copying cp
  • Copy a single file
  • Copy folders
• Internal variables
  • Internal variables
  • Bash internal variables at a glance
  • Untitled
  • Untitled
  • HOME
  • etc...
  • Untitled
  • FUNCNAME
  • Untitled
  • Untitled
  • PWD
  • HISTSIZE
  • IFS
  • Untitled
  • OLDPWD
  • PATH
  • OSTYPE
  • MACHTYPE
  • PPID
  • HOSTTYPE
  • SECONDS
  • SHELLOPTS
  • HOSTNAME
  • EDITOR
  • BASH VERSION
  • BASH VERSINFO
  • BASH ENV
  • BASHPID
  • Untitled
  • RANDOM
  • SHLVL
  • LINENO
  • GROUPS
  • UID
• Job control
  • Job Control
  • List background processes
  • Bring a background process to the foreground
  • Restart stopped background process
  • Run command in background
  • Stop a foreground process
• Case statement
  • Case statement
  • Simple case statement
  • Case statement with fall through
  • Fall through only if subsequent patterns match
• Word splitting
  • Word splitting
  • What when and Why
  • Bad effects of word splitting
  • IFS word splitting
  • Usefulness of word splitting
  • Splitting with IFS
  • Splitting by separator changes
• Read a file
  • Read a file data stream variable line-by-line andor field-by-field
  • Looping through a file line by line
  • Looping through the output of a command field by field
  • Read lines of a file into an array
  • Read lines of a string into an array
  • Looping through the output of a command line by line
  • Read a file field by field
  • Read a string field by field
  • Read fields of a file into an array
  • Read fields of a string into an array
  • Looping through a string line by line
  • Reads file etcpasswd line by line and field by field
• File transfer with scp
  • File Transfer using scp
  • scp transferring file
  • scp transferring multiple files
  • Downloading file using scp
• Pipelines
  • Pipelines
  • Using
  • Show all processes paginated
  • Modify continuous output of a command
• Managing PATH environment variable
  • Managing PATH environment variable
  • Add a path to the PATH environment variable
  • Remove a path from the PATH environment variable
• Avoiding date using printf
  • Avoiding date using printf
  • Get the current date
  • Set variable to current time
• Chain of commands and operations
  • Chain of commands and operations
  • Counting a text pattern ocurrence
  • transfer root cmd output to user file
  • logical chaining of commands with and
  • serial chaining of commands with semicolon
  • chaining commands with
• Type of shells
  • Type of Shells
  • Start an interactive shell
  • Detect type of shell
  • Introduction to dot files
• true, false and commands
  • true false and commands
  • Infinite Loop
  • Function Return
  • Code that will alwaysnever be executed
• Color script output cross-platform
  • Color script output cross-platform
  • color-output.sh
• Navigating directories
  • Navigating directories
  • Absolute vs relative directories
  • Change to the last directory
  • Change to the home directory
  • Change to the Directory of the Script
• Using sort
• Namespace
  • Namespace
  • There are no such things as namespaces
• co-processes
  • co-processes
  • Hello World
• Typing variables
  • Typing variables
  • declare weakly typed variables
• Jobs at specific types
  • Jobs at specific times
  • Execute job once at specific time
  • Doing jobs at specified times repeatedly using systemd.timer
• Associative arrays
  • Associative arrays
  • Examining assoc arrays
• Handling the system prompt
  • Handling the system prompt
  • Using the PROMPT COMMAND envrionment variable
  • Using PS2
  • Using PS3
  • Using PS4
  • Using PS1
• Creating directories
  • Creating directories
  • Move all files not already in a directory into a self named directory
• File execution sequence
  • File execution sequence
  • .profile vs .bash profile and .bash login
• The cut command
  • The cut command
  • Only one delimiter character
  • Repeated delimiters are interpreted as empty fields
  • No quoting
  • Extracting not manipulating
  • Basic usage
• Bash on Windows 10
  • Bash on Windows 10
  • Readme
• Cut command
  • Cut Command
  • Show the first column of a file
  • Show columns x to y of a file
• Splitting files
  • Splitting Files
  • Split a file
  • We can use sed with w option to split a file into mutiple files. Files can be split by specifying line address or pattern.
• Global and local variables
  • global and local variables
  • Global variables
  • Local variables
  • Mixing the two together
• Design Patterns
  • Design Patterns
  • The PublishSubscribe PubSub Pattern
• CGI Scripts
  • CGI Scripts
  • Request Method GET
  • Request Method POST w JSON
• Select keyword
  • Select keyword
  • Select keyword can be used for getting input argument in a menu format
• When to use eval
  • When to use eval
  • Using Eval
  • Using Eval with Getopt
• Networking with bash
  • Networking With Bash
  • Networking commands
• Parallel
  • Parallel
  • Parallelize repetitive tasks on list of files
  • Parallelize STDIN
• Grep
  • Grep
  • How to search a file for a pattern
• Strace
  • strace
  • How to observe the system calls of a program
• Sleep
  • Sleep utility
  • sleep 1
• Decodi
  • Decoding URL
  • Simple example
  • Using printf to decode a string
• Contributors