bash programming

1. CheetSheet
2. GNU's Manual
3. Arithmetic
4. Arrays
5. Base and Extensions
6. Escape Sequences

CheetSheet

GNU's Manual

Arithmetic

• let expression - Make a variable equal to an expression.
• expr expression - Print out the result of the expression.
• $(( expression )) - Return the result of the expression. eg a=$(( 4 + 5 )) or ((i++))
• ${#var} - Return the length of the variable var.

Arrays

Base and Extensions

Escape Sequences

• \a Alert (bell).
• \c Suppress trailing newline.
• \e Escape.
• \f Form feed.
• \n Newline.
• \t Horizontal tab.
• \v Vertical tab.
• \\ Backslash.
• \0NNN The eight-bit character whose value is the octal value NNN (zero to three octal digits).
• \NNN The eight-bit character whose value is the octal value NNN (one to three octal digits).
• \xHH The eight-bit character whose value is the hexadecimal value (one or two hexadecimal digits).