linux 大小寫轉化

(1)sed:

cat file | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'

 

(2)tr:

cat file | tr a-z A-Z

cat file | tr "[:lower:]" "[:upper:]"

 

(3)perl:

$string="abcdef";

$string =~ tr/[a-z]/[A-Z]/;

or

$string=uc($string); #大小轉小寫用lc,具體參見perldoc -f lc與perdoc -f uc