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www/eps/hpr2739/hpr2739_bash19_ex2.sh

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+#!/bin/bash
+
+#-------------------------------------------------------------------------------
+# Example 2 for Bash Tips show 19: the mapfile/readarray command
+#-------------------------------------------------------------------------------
+
+#
+# Declare an indexed array
+#
+declare -a map
+
+#
+# Fill the array with a process substitution that generates 10 random numbers,
+# each followed by a newline (the default delimiter). We remove the newline
+# characters.
+#
+mapfile -t map < <(for i in {1..10}; do echo $RANDOM; done)
+
+#
+# Show the array as a list
+#
+echo "map: ${map[*]}"
+echo
+
+#
+# Declare a new indexed array
+#
+declare -a daffs
+
+#
+# Define a string with spaces replaced by underscores
+#
+words="I_wandered_lonely_as_a_Cloud_That_floats_on_high_o'er_vales_and_Hills,_When_all_at_once_I_saw_a_crowd,_A_host,_of_golden_Daffodils"
+
+#
+# Fill the array with a process substitution that provides the string. The
+# delimiter is '_' and we remove it as we load the array
+#
+mapfile -d _ -t daffs < <(echo -n "$words")
+
+#
+# Show the array as a list
+#
+echo "daffs: ${daffs[*]}"
+echo
+
+#
+# Fill an array with 100 random dictionary words. Use 'printf' as the callback
+# to report every 10th word using -C and -c
+#
+declare -a big
+mapfile -t -C "printf '%02d %s\n' " -c 10 big < <(grep -E -v "'s$" /usr/share/dict/words | shuf -n 100)
+echo
+
+#
+# Report every 10th element of the populated array in the same way
+#
+echo "big: ${#big[*]} elements"
+for ((i = 9; i < ${#big[*]}; i=i+10)); do
+    printf '%02d %s\n' "$i" "${big[$i]}"
+done
+
+exit