Changing the first letter of every line in a file to uppercase

Question

I need to change the first letter of every line in a file to uppercase, e.g.

the bear ate the fish.
the river was too fast.

Would become:

Answer 1

pearl.311> cat file1
linenumber11
linenumber2  
linenumber1
linenumber4
linenumber6
pearl.312> awk '{print toupper(substr($0,1,1))""substr($0,2)}' file1
Linenumber11
Linenumber2  
Linenumber1
Linenumber4
Linenumber6
pearl.313>