Help on "tr' command Post: 302451573

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Top Forums Shell Programming and Scripting Help on "tr' command Post 302451573 by methyl on Tuesday 7th of September 2010 08:47:15 AM

09-07-2010

Registered User

Code:

tr -cd '[:print:]\n'

The second "tr" command deletes every character which is not in the "printing characters" set called ":print:" except a line-feed character "\n".
The first "tr" commands has already removed some characters which are in the "printing characters" set. It is referring to the Octal value of each character (e.g. \003 is the control code Ctrl/C).
The final result contains a subset of the characters which are in the "printing characters" set or line-feed characters.

On my unix computer the explanation of the meaning of ":print:" is in "man 5 regexp". It will probably be a different "man" page in Linux.

The script posted would only make sense if the input file was already in ASCII (not EBCDIC) or perhaps the environment locale has been changed?

methyl

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