Grepping in bash

This option will search in the filename for two occurances of character “e”

ls | grep "e\{2\}"

This option will search in the filename for whitespace characters including tabs, pagebreaks, space and others.

ls | grep "\s"

Use a plus modifier to look for more than one occurances.

ls | grep "\s\+"

To look for a single whitespace character that is space use following.

ls | grep "[[:blank:]]"

A modifier plus sign may be used to alter the number of occurances to look for. A special character \t will match tabs.