upper converts all lowercase letters to UPPERCASE letters.
upper reads input either from a command line argument or standard input.
See also: lower
- upper text (md5 = 3ac8c0624c6849fe3bf4d6e2483b9a48)
- upper.gz zipped (md5 = 07563af24b9b5a144b22ac0a180665cb)
- 0 - No errors were encountered
- 1 - More than one file was specified as an argument
- 2 - The file specified on the command line does not exist
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