Test if a string has a period in it with bash

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http://unix.stackexchange.com – I want to run a bash command on output from Drupal's drush command-line interface. drush site-alias returns a list of webroots, first showing the name of the group, and then each site in that group. The site itself is aliased in the form group.site. For instance, you might get internal internal.site1 internal.site2 external external.site1 external.site2 marketing marketing.site1 marketing.site2 I want to do a command on each of the site aliases, but not on the group alias itself. I need to test if the string has a period in it, and if so, run it: for i in $(drush site-alias); do {if no peri (HowTos)