- 01Setting up (what you'll need)
- 02Your first shell script (echo)
- 03Using variables
- 04Command-line arguments ($1, $2 ...)
- 05Branching (the if statement)
- 06Repeating (the for loop)
- 07Repeating (the while loop)
- 08Writing your own function
- 09Working with arrays
- 10Command substitution ($())
- 11Working with strings (parameter expansion)
- 12Reading from standard input (read)
- 13Exit status and && / ||
- 14Pipes and redirection
- 15The case statement
- 16Arithmetic ($(( )))
- 17The basics of grep, sed and awk
- 18Argument checks and error handling
- 19Function return values and exit codes
- 20[Project] Build a small log-tallying script
Working with arrays
This lesson covers the array, which handles several values together.
An array is declared as name=(value1 value2 value3). To take every element you write ${name[@]}, and for the element count ${#name[@]}.
The sample code creates the array fruits=("apple" "orange" "grape") and displays every element with for f in "${fruits[@]}"; do echo "$f"; done.
A common early stumble is separating the elements with commas. A shell script array lists its values separated by spaces: (value1 value2 value3).
In professional work, arrays are used to hold a list of file names or server names, and combined with a for loop to process them all in one pass.
๐งช This site can't compile or run Shell Script directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser โ nothing is sent anywhere).