-s string

change all letters in string to uppercase. Any other command line options are ignored and tables or files waiting to be read from the standard input are flushed.

-fc

use c as the input field separation character for tableorlist.

-h

print out the header rows in tableorlist as is, without any case alterations.

column ...

uppercase only that text found in column(s) from tableorlist.

$ uppercase -s 'this is a fine state of affairs!'
THIS IS A FINE STATE OF AFFAIRS!

$ cat inventory
Item    Amount  Cost    Value   Description
----    ------  ----    -----   --------------
   1         3    50      150   Rubber Gloves
   2       100     5      500   Test Tubes
   3         5    80      400   Clamps

$ uppercase < inventory
ITEM    AMOUNT  COST    VALUE   DESCRIPTION
----    ------  ----    -----   --------------
   1         3    50      150   RUBBER GLOVES
   2       100     5      500   TEST TUBES
   3         5    80      400   CLAMPS

$ uppercase -h description < inventory
Item    Amount  Cost    Value   Description
----    ------  ----    -----   --------------
   1         3    50      150   RUBBER GLOVES
   2       100     5      500   TEST TUBES
   3         5    80      400   CLAMPS