#!/bin/bash

#-------------------------------------------------------------------------------
# Example 5 for Bash Tips show 17: Trimming leading or trailing parts
#-------------------------------------------------------------------------------

#
# Make an indexed array of root vegetables
#
declare -a vegs=(celeriac artichoke asparagus parsnip mangelwurzel daikon turnip)
printf '%s\n\n' "${vegs[*]}"

#
# Demonstrate some trimming
#
echo "1. Removing the first character:"
echo "${vegs[@]#?}"

echo "2. Removing characters up to and including the first vowel:"
echo "${vegs[@]#*[aeiou]}"

echo "3. Removing characters up to and including the last vowel:"
printf '[%s] ' "${vegs[@]##*[aeiou]}"
echo

echo "4. Using an extglob pattern to remove several different leading patterns:"
shopt -s extglob
echo "${vegs[@]#@(cele|arti|aspa|mangel)}"

echo "5. Removing the last character":
echo "${vegs[@]%?}"

echo "6. Removing from the last vowel to the end:"
echo "${vegs[@]%[aeiou]*}"

echo "7. Removing from the first vowel to the end:"
printf '[%s] ' "${vegs[@]%%[aeiou]*}"
echo

echo "8. Using an extglob pattern to remove several different trailing patterns:"
echo "${vegs[@]%@(iac|oke|gus|nip|zel)}"