Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
 
For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Removing control characters using tcl

Posted by awalia (awalia), 28 January 2007
Hi I want to write tcl script to remove the following control characters from a file.

[m
^M
^H
^[

For this I want to use "sed". I have been succesful in doing the third and the fourth using eval and sed, but have no success with the first two.

Note: I do know that to have control character ^M, I have to use Ctrl+V and Ctrl+M.



Posted by admin (Graham Ellis), 29 January 2007
I would use regsub.   There's an example that converts all control characters into their unicode equivalents here which should get you started.  Please post up sample code if you have any further problems, or indeed if you get it working, please let us know with an example that others can learn from too.   Thanks!

Posted by awalia (awalia), 29 January 2007
This is how I remove the characters ^H and ^[

eval "exec sed \"s/^H//g\" | sed \"s/^[//g\" < file1 > file2"



Posted by admin (Graham Ellis), 30 January 2007
I would use regsub.  Tcl is perfectly capable of making the changes you need without using another language / program.  

I've just noticed that you said "I want to use sed", though.   Why?  It seems an odd way to go ...



This page is a thread posted to the opentalk forum at www.opentalk.org.uk and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2024: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • FAX: 01144 1225 793803 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho