linux grep

siid@siid-Asus-Ranger:~$ ls -a
. .bash_history .compiz ddl Documents .gnome .local Music Pictures .ssh .Xauthority
.. .bash_logout .config Desktop Downloads .gnupg .macromedia .nano .pki .sudo_as_admin_successful .xsession-errors
.adobe .bashrc .dbus .dmrc .gconf .gvfs MEGAsync .nv .profile Templates .xsession-errors.old
.bash_aliases .cache dd doc .gksu.lock .ICEauthority .mozilla .nvidia-settings-rc Public Videos
siid@siid-Asus-Ranger:~$ ls -a |grep -i .xau*
.Xauthority
siid@siid-Asus-Ranger:~$ ls -a |grep -i .xa*
.Xauthority
.xsession-errors
.xsession-errors.old
siid@siid-Asus-Ranger:~$ ls -a |grep -i .x*
siid@siid-Asus-Ranger:~$ ls -a |grep -i .*x
.Xauthority
.xsession-errors
.xsession-errors.old
siid@siid-Asus-Ranger:~$ ls -a |grep -i .*xa
.Xauthority
siid@siid-Asus-Ranger:~$ ls -a |grep -i .*xs
.xsession-errors
.xsession-errors.old
siid@siid-Asus-Ranger:~$ ls -a |grep -i .xs*
siid@siid-Asus-Ranger:~$