{} in bash 

*Tags*: bash {}

$ echo aa{a,b}
aaa aab
echo mkdir -p /mnt/iso{1,2,3,4,5}
echo mkdir -p /mnt/tmp{,1,2}
echo mkdir -p /dos/drv_{a,b,c}{1,2,3,4}

no any space allowed 

bash$ echo m{1,2,3} n{1,2,3}
m1 m2 m3 n1 n2 n3
bash$ echo m{1,2,3 a b} n{1,2,3}
m{1,2,3 a b} n1 n2 n3
bash$ echo m{1,2,3,a,b} n{1,2,3}
m1 m2 m3 ma mb n1 n2 n3
bash$ echo m{1,2,3,a, b}
m{1,2,3,a, b}