Pure Bash Bible

FOREWORD

STRINGS

1. Trim leading and trailing white-space from string
2. Trim all white-space from string and truncate spaces
3. Use regex on a string
4. Split a string on a delimiter
5. Change a string to lowercase
6. Change a string to uppercase
7. Trim quotes from a string
8. Strip all instances of pattern from string
9. Strip first occurrence of pattern from string
10. Strip pattern from start of string
11. Strip pattern from end of string
12. Check if string contains a sub-string
13. Check if string starts with sub-string
14. Check if string ends with sub-string

ARRAYS

1. Reverse an array
2. Remove duplicate array elements
3. Random array element
4. Cycle through an array
5. Toggle between two values

LOOPS

1. Loop over a range of numbers
2. Loop over a variable range of numbers
3. Loop over an array
4. Loop over an array with an index
5. Loop over the contents of a file
6. Loop over files and directories

FILE HANDLING

1. Read a file to a string
2. Read a file to an array (by line)
3. Get the first N lines of a file
4. Get the last N lines of a file
5. Get the number of lines in a file
6. Count files or directories in directory
7. Create an empty file
8. Extract lines between two markers

FILE PATHS

1. Get the directory name of a file path
2. Get the base-name of a file path

VARIABLES

1. Assign and access a variable using a variable

ESCAPE SEQUENCES

1. Text Colors
2. Text Attributes
3. Cursor Movement
4. Erasing Text

PARAMETER EXPANSION

1. Indirection
2. Replacement
3. Length
4. Expansion
5. Case Modification
6. Default Value

BRACE EXPANSION

1. Ranges
2. String Lists

ARITHMETIC OPERATORS

1. Assignment
2. Arithmetic
3. Bitwise
4. Logical
5. Miscellaneous

ARITHMETIC

1. Simpler syntax to set variables
2. Ternary Tests

TRAPS

1. Do something on script exit
2. Ignore terminal interrupt (CTRL+C, SIGINT)
3. React to window resize.
4. Do something before every command.
5. Do something when a shell function or a sourced file finishes executing

PERFORMANCE

1. Disable Unicode

OBSOLETE SYNTAX

1. Shebang
2. Command Substitution
3. Function Declaration

INTERNAL VARIABLES

1. Get the location to the bash binary
2. Get the version of the current running bash process
3. Open the user’s preferred text editor
4. Get the name of the current function
5. Get the host-name of the system
6. Get the architecture of the Operating System
7. Get the name of the Operating System / Kernel
8. Get the current working directory
9. Get the number of seconds the script has been running
10. Get a pseudorandom integer

INFORMATION ABOUT THE TERMINAL

1. Get the terminal size in lines and columns (from a script)
2. Get the terminal size in pixels
3. Get the current cursor position

CONVERSION

1. Convert a hex color to RGB
2. Convert an RGB color to hex

CODE GOLF

1. Shorter for loop syntax
2. Shorter infinite loops
3. Shorter function declaration
4. Shorter if syntax
5. Simpler case statement to set variable

OTHER

1. Use read as an alternative to the sleep command
2. Check if a program is in the user’s PATH
3. Get the current date using strftime
4. Generate a UUID V4
5. Progress bars
6. Get the list of functions in a script
7. Bypass shell aliases
8. Bypass shell functions