mac上bash中的大小写

在bash中,可以使用nocaseglob

shopt -s nocaseglob
for file in *.jpg *.jpeg *.gif
do
  echo "$file"
done
#turn off
shopt -u nocaseglob

一般来说,要转换案例,有多种方法

echo "stRING" | awk '{print toupper($0)}'

echo "STRING" | tr "[A-Z]" "[a-z]" # upper to lower

echo "StrinNG" | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' #lower to upper

这是bash内置的:

要将$Y转换为大写:

y="this Is A test"
echo "${y^^}"

并将$Y转换为小写:

y="THIS IS a TeSt"
echo "${y,,}"

$ echo 'this IS some TEXT' | tr '[:upper:]' '[:lower:]'
this is some text

在bash中可以使用 资本化 :

echo "HelLo! how ArE you?" | capitalize -u

echo "HelLo! how ArE you?" | capitalize -l

echo "HelLo! how ArE you?" | capitalize -c