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並前往https://superuser.com/questions/935374/difference-between-and-in-shell-script/935427

Difference between ${} and $() in a shell script - Super User

echo ${animal}s cats $ echo $animal_food # No such variable as “animal_food”. ... cat myecho.sh echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $10 $11 $12 $13 $14 $15 $ .

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