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Script Libraries: Share Code

Script libraries share code. Reusable functions. Common utilities.

Here's the thing: Libraries let you reuse code. Write once. Use everywhere.

Creating Libraries​

# lib.sh
function log_info() {
    echo "[INFO] $1"
}

My take: Libraries are files with functions. Simple.

Using Libraries​

source lib.sh
log_info "Message"

My take: Source libraries. Use functions.

Common Patterns​

Utility Library​

# utils.sh
function is_file() {
    [ -f "$1" ]
}

What's Next?​

Now that you understand libraries, let's talk about Configuration Files.

Personal note: Libraries seemed unnecessary at first. Then I used them. Now I use them constantly. They're useful. Use them.