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PObash - compare string against keys of an associative array
 

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    <p>Consider the following bash code:</p> <pre><code>echo -e "\nThe following versions are available for install:" declare -A VERS CNT=0 for FILE in `ls ${ASSET_DIR}/enterprise`; do let "CNT++" VERS_STR=`sed -e 's/^file-\([0-9].[0-9].[0-9]\).zip/\1/' &lt;&lt;&lt; ${FILE}` VERS[${CNT}]=${VER_STR} done for i in ${!VERS[@]}; do echo " ${i} - ${VERS[${i}]}" done echo -n "Which version do you want to install?: " read VERS_INPUT </code></pre> <p><code>$VERS_INPUT</code> should equate to one of the keys in the associative array <code>$VERS</code>. How can I verify that the value of <code>$VERS_INPUT</code> equals any of the keys of <code>$VERS</code>. As it stands right now, with our current setup, there's 6 available options generated from the for loop(s), but this has potential to grow, thus I don't want to make it a static check and have to change the script every time an additional file gets put in <code>${ASSET_DIR}/enterprise</code>. I presume an if statement is in order, but I'm not certain how I would check that it matches a key from the associative array.</p> <hr> <p><strong>EDIT:</strong></p> <p>To give an example, lets say the first for loop dynamically generated the associative array <code>$VERS</code> with four values:</p> <pre><code>$ echo $ENV["1"] 3.4.3 $ echo $ENV["2"] 3.4.4 $ echo $ENV["3"] 3.4.5 $ echo $ENV["4"] 3.4.6 </code></pre> <p>The user is prompted to enter a value (assigned to variable <code>$VERS_INPUT</code>) that should hopefully be 1, 2, 3, or 4. How can I check that the value of <code>$VERS_INPUT</code> is either 1, 2, 3, or 4. Obviously this is an arbitrary example, since my list is currently at 6 available options, and is only going to grow further. I want to make this as dynamic as possible, since 1, 2, 3, 4, etc... is dynamically generated from the first for loop and is not manually generated.</p>
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    1. CODon't parse the output of `ls` if you can avoid it. Whitespace is our enemy. Whitespace in filenames is a massive enemy. `for FILE in ${ASSET_DIR}/enterprise/*; do` should do it. Take care on hidden files.
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