Andy's blog

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从标准输入中替换，缩减，删除字符，并将结果写到标准输出 -d 删除字符 -s 保留连续字符的第一个字符，删除其他字符 -c 使用第一个字符串的补集，取反

 ✘  ~/Desktop  cat code.py 


class A:
    def __enter__(self):
        a = 1

    def __exit__(self):
        b = 2

with A() as obj:
    print(obj)


 ~/Desktop  tr 'class' 'Module' < code.py              


Modll A:
    def __enter__(leof):
        d = 1

    def __exit__(leof):
        b = 2

with A() dl obj:
    print(obj)

大小写转换

 ~/Desktop  tr '[a-z]' '[A-Z]' < code.py 


CLASS A:
    DEF __ENTER__(SELF):
        A = 1

    DEF __EXIT__(SELF):
        B = 2

WITH A() AS OBJ:
    PRINT(OBJ)

删除字符

 ✘  ~/Desktop  tr -d 'A' < code.py


class :
    def __enter__(self):
        a = 1

    def __exit__(self):
        b = 2

with () as obj:
    print(obj)

删除文件中的换行，制表符

~/Desktop  tr -d '\n\t' < code.py
class A:def __enter__(self):a = 1def __exit__(self):b = 2with A() as obj:print(obj)%

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