📅  最后修改于: 2022-03-11 14:55:34.834000             🧑  作者: Mango
# capitalize a vowels in raw string 'hello'
echo abc | tr aeou AEOU
hEllO
# capitalize vowels in text from file 'hello_world.text'
tr aeou AEOU < hello_world.text
hEllO wOrld