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filter command

Let's write a simple filter command that can be used in a pipeline:

$ cat file.txt | upper

It must print the content of a file in full uppercase.

The input is processed line by line.

Running example:

$ nim c upper.nim

$ cat upper.nim | ./upper
IMPORT STD/UNICODE

FOR LINE IN STDIN.LINES:
  ECHO LINE.TOUPPER

The Python program works similarly.