为什么我的tr只能替换第一个字符？

beginner-bj

我记得以前用同样的写法是能够替换整个字符串的，今天突然不行了，难道我记错了？

1. bash-2.03# echo "this is a test string" |tr a-z A-Z
   
2. this is A test string
   
3. bash-2.03#

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我希望得到这样的效果：

1. bash-2.03# echo "this is a test string" |tr [:lower:] [:upper:]
   
2. THIS IS A TEST STRING
   
3. bash-2.03#

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Minsic

1. $echo "this is a test string"|tr [a-z] [A-Z]
   
2. THIS IS A TEST STRING

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another test:

1. oracle>echo "this-is-a-test-string,test-z"|tr a-z A" "Z
   
2. this is A test string,test Z

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bjgirl

1. $echo "this is a test string"|tr a-z A-Z
   
2. THIS IS A TEST STRING

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1. 
   
2. tr version:
   
3. tr (textutils) 2.0.21

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beginner-bj

man过之后才知道，原来是这样

1. bash-2.03$ echo "this is a test string" |/usr/xpg4/bin/tr a-z A-Z
   
2. THIS IS A TEST STRING
   
3. bash-2.03$ which tr
   
4. /usr/bin/tr
   
5. bash-2.03$ echo "this is a test string" |/usr/bin/tr a-z A-Z
   
6. this is A test string
   
7. bash-2.03$

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