prompt>  echo hi{DDD,BBB,CCC,AAA}there
hiDDDthere hiBBBthere hiCCCthere hiAAAthere

prompt>  mv info{,.old}   -> mv info info.old

prompt>  echo 1 to 10 is {1..10}
1 to 10 is 1 2 3 4 5 6 7 8 9 10

prompt> echo a{A{1,2},B{3,4}}b
aA1b aA2b aB3b aB4b 

prompt> mkdir {2007..2009}-0{1..9} {2007..2009}-{10..12}
prompt> ls
2007-01 2007-07 2008-01 2008-07 2009-01 2009-07
2007-02 2007-08 2008-02 2008-08 2009-02 2009-08
2007-03 2007-09 2008-03 2008-09 2009-03 2009-09
2007-04 2007-10 2008-04 2008-10 2009-04 2009-10
2007-05 2007-11 2008-05 2008-11 2009-05 2009-11
2007-06 2007-12 2008-06 2008-12 2009-06 2009-12

prompt> echo {Z..A}  
Z Y X W V U T S R Q P O N M L K J I H G F E D C B A