E:\tmp>ls
1gfJaJTeoh
CFG1584.tmp
CFG1587.tmp
EScan
ExchangePerflog_8484fa31f2d96a21cfcccd43.dat
Perflib_Perfdata_784.dat
SCP1D28.tmp
SCPA62.tmp
VBE
WINWORD.log
add_service_authentication_columns.sql
add_service_authentication_columns.sql.bak
ch01.pdf
create_export_tables-2.sql
create_export_tables-2.sql.bak
en-only.rws.swp
jusched.log
msohtml
msohtml1
perldoc_BDeparse_T439ed4fb_d50b1.txt
perldoc_perlfunc_T439eb5b6_bc83c.txt
plugtmp
svn000.tmp.pl
tmp158D.exe
tmp158D.tmp
tmp158E.tmp
tmp1592.tmp
tmp180E.tmp
tmp1811.tmp
~DF67F.tmp
~DF68C.tmp
~DF723C.tmp
~DF850E.tmp
~DFDDFC.tmp
~WRD0828.doc
~WRF2409.tmp
~WRS0003.tmp
~WRS0004.tmp

E:\tmp>ls | grep -oE "\.\w+$" | sort -u
.bak
.dat
.doc
.exe
.log
.pdf
.pl
.sql
.swp
.tmp
.txt
.xls

E:\tmp>