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www/eps/hpr2719/hpr2719_bash17_ex5.sh

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+#!/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)}"
+