Data commit

Task/Arrays/UNIX-Shell/arrays-1.sh

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+alist=( item1 item2 item3 )  # creates a 3 item array called "alist"
+declare -a list2        # declare an empty list called "list2"
+declare -a list3[0]     # empty list called "list3"; the subscript is ignored
+
+# create a 4 item list, with a specific order
+list5=([3]=apple [2]=cherry [1]=banana [0]=strawberry)

Task/Arrays/UNIX-Shell/arrays-10.sh

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+unset alist

Task/Arrays/UNIX-Shell/arrays-2.sh

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+count=${#alist[*]}
+echo "The number of items in alist is ${#alist[*]}"

Task/Arrays/UNIX-Shell/arrays-3.sh

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+x=0
+while [[ $x < ${#alist[*]} ]]; do
+  echo "Item $x = ${alist[$x]}"
+  : $((x++))
+done

Task/Arrays/UNIX-Shell/arrays-4.sh

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+x=${#alist[*]}       # start with the number of items in the array
+while [[ $x > 0 ]]; do     # while there are items left
+  : $((x--))               # decrement first, because indexing is zero-based
+  echo "Item $x = ${alist[$x]}"   # show the current item
+done

Task/Arrays/UNIX-Shell/arrays-5.sh

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+alist[${#alist[*]}]=new_item

Task/Arrays/UNIX-Shell/arrays-6.sh

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+# shell function to append values to an array
+# push LIST VALUES ...
+push() {
+  local var=${1:?'Missing variable name!'}
+  shift
+  eval "\$$var=( \"\${$var[@]}\" \"$@\" )"
+}
+
+push alist "one thing to add"
+push alist many words to add

Task/Arrays/UNIX-Shell/arrays-7.sh

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+unset alist[0]

Task/Arrays/UNIX-Shell/arrays-8.sh

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+# pop ARRAY -- pop the last item on ARRAY and output it
+
+pop() {
+  local var=${1:?'Missing array name'}
+  local x ;   eval "x=\${#$var[*]}"
+  if [[ $x > 0 ]]; then
+    local val ; eval "val=\"\${$var[$((--x))]}\""
+    unset $var[$x]
+  else
+    echo 1>&2 "No items in $var" ; exit 1
+  fi
+  echo "$val"
+}
+
+alist=(a b c)
+pop alist
+a
+pop alist
+b
+pop alist
+c
+pop alist
+No items in alist

Task/Arrays/UNIX-Shell/arrays-9.sh

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+unset alist[*]