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POHow to optimize a bash script? (Find files, ignore those on whitelist, report rest)
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copied!<p>I wrote this script to find all files/directories to which $WWWUSER has write permissions. At first I stored the remaining, matching items in a temporary file. I new there must be a way without using files, so this is my "solution". It works, but it's pretty slow. Any tips?</p> <p><strong>Update:</strong> On a directory structure containing about 7k directories and 30k files (~8k whitelistings) the script takes about 15 minutes... (ext3 filesystem, UW320 SCSI harddisk).</p> <pre><code>#!/usr/bin/env bash # Checks the webroot for files owned by www daemon and # writable at the same time. This is only needed by some files # So we'll check with a whitelist WWWROOT=/var/www WWWUSER=www-data WHITELIST=(/wp-content/uploads /wp-content/cache /sitemap.xml ) OLDIFS=$IFS IFS=$'\n' LIST=($(find $WWWROOT -perm /u+w -user $WWWUSER -o -perm /g+w -group $WWWUSER)) IFS=$OLDIFS arraycount=-1 whitelist_matches=0 for matchedentry in "${LIST[@]}"; do arraycount=$(($arraycount+1)) for whitelistedentry in "${WHITELIST[@]}"; do if [ $(echo $matchedentry | grep -c "$whitelistedentry") -gt 0 ]; then unset LIST[$arraycount] whitelist_matches=$(($whitelist_matches+1)) fi done LISTCOUNT=${#LIST[@]} done if [ $(echo $LISTCOUNT) -gt 0 ]; then for item in "${LIST[@]}"; do echo -e "$item\r" done echo "$LISTCOUNT items are writable by '$WWWUSER' ($whitelist_matches whitelisted)." else echo "No writable items found ($whitelist_matches whitelisted)." fi </code></pre>

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