Member Avatar for nileshdalvi

Is this valid in shell programming?
tr 'a-z' 'A-Z' < filename>filename
note: The filename refers to the same file.

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  • Latest Post Latest Post by jim mcnamara
Member Avatar for jim mcnamara 
tr -s '[:lower:]'  '[:upper:]'  < filename > newfilename

You have to use POSIX character classes, not "regex" classes.
this: < filename > filename : causes filename to be truncated to zero length BEFORE tr runs.

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