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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Neil Williams wrote: > I've seen and used this syntax: > > $ prog < input.file > output.file > > (but can't remember when or with which prog!) Any which behaves as a "filter". Filter is the magic word. As in "writing unix filters" ;) > Can 'prog' be given options in such a syntax? Of course. > I'd like to see how it works in the source so if anyone knows of a program > that can do this (and which is written in C), it would be handy! Try "apt-get source coreutils" for various examples - probably one of the simplest is "tr". There is a simpler example here, but whether than is upto GNU standards I'm not sure. http://www-128.ibm.com/developerworks/linux/library/l-clutil/ However there is a long way from my understanding of how they ought to work, to coding it, and my C isn't upto it yet. -----BEGIN PGP SIGNATURE----- Comment: Encryption...is a powerful defensive weapon for free people. Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFC6+WgGFXfHI9FVgYRAvtFAJ0Vx9E34aK+0GulbQbHbXwSE3wkfgCfYm99 PkkWCL1HI+wUWNMVNfIuFj8= =al1i -----END PGP SIGNATURE----- -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe. FAQ: www.dcglug.org.uk/linux_adm/list-faq.html