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    <p>Arrays in the Korn shell (and Bash and others) are sparse, so if you use <code>unset</code> to delete members of the array, you won't be able to use the size of the array as an index to the last member and other limitations.</p> <p>Here are some useful snippets (the second <code>for</code> loop is something you might be able to put to use right away):</p> <pre><code>array=(1 2 3) unset array[2] echo ${array[2]} # null indices=(${!array[@]}) # create an array of the indices of "array" size=${#indices[@]} # the size of "array" is the number of indices into it size=${#array[@]} # same echo ${array[@]: -1} # you can use slices to get array elements, -1 is the last one, etc. for element in ${array[@]}; do # iterate over the array without an index for index in ${indices[@]} # iterate over the array WITH an index do echo "Index: ${index}, Element: ${array[index]}" done for index in ${!array[@]} # iterate over the array WITH an index, directly </code></pre> <p>That last one can eliminate the need for a counter.</p> <p>Here are a couple more handy techniques:</p> <pre><code>array+=("new element") # append a new element without referring to an index ((counter++)) # shorter than ((counter=counter+1)) or ((counter+=1)) if [[ $var == 3 ]] # you can use the more "natural" comparison operators inside double square brackets while [[ $var &lt; 11 ]] # another example echo ${array[${index}-1] # math inside an array subscript </code></pre> <p>This all assumes ksh93, some things may not work in earlier versions.</p>
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    1. USDennis Williamson
    1. USDennis Williamson
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    1. COAwesome...thanks a lot Dennis! These are really handy to know and I'll put them to use asap :)
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