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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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 the new line with chop or chomp in Perl - what is the difference?

Where Perl supports functions of similar names, you'll find they do similar things - such as chop v chomp.

chop always removes the last character of a string
  whereas
chomp removes the last character of a string but only if it is a new line

Both chop and chomp alter the variable that's passed in to them and they return result; in the case of chop, that's the character that was removed and in the case of chomp (since you'll already know the character), it's the number of characters removed.

Since functions like print, printf and sprintf all output the result of any other functions they call, using a chop or chomp directly with a one of them will result in a new line or a count being displayed / output, rather than a reduced version of the input string.

Sample program ... including sample outputs ... [here]




Notes

chomp will also work on a list, removing final new-line characters from each member of the list

• If you want to trim all the white spaces, as well as any new line character, off the end of a string, you can do it in a single operation using the s operator:
  $varname =~ s/\s+$//;
which (in literal terms) replaces one or more trailing white space characters - space, tab, new line and carriage return - with nothing.
(written 2010-09-21)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P205 - Perl - Initial String Handling
  [31] Here documents - (2004-08-28)
  [254] x operator in Perl - (2005-03-22)
  [324] The backtick operator in Python and Perl - (2005-05-25)
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [1195] Regular Express Primer - (2007-05-20)
  [1608] Underlining in Perl and Python - the x and * operator in use - (2008-04-12)
  [1849] String matching in Perl with Regular Expressions - (2008-10-20)
  [1860] Seven new intermediate Perl examples - (2008-10-30)
  [2798] Perl - skip the classics and use regular expressions - (2010-06-08)
  [2816] Intelligent Matching in Perl - (2010-06-18)
  [2832] Are you learning Perl? Some more examples for you! - (2010-06-27)
  [3005] Lots of ways of doing it in Perl - printing out answers - (2010-10-19)
  [3411] Single and double quotes strings in Perl - what is the difference? - (2011-08-30)
  [3547] Using Perl to generate multiple reports from a HUGE file, efficiently - (2011-12-09)
  [3548] Dark mornings, dog update, and Python and Lua courses before Christmas - (2011-12-10)
  [3770] Sample answers to training course exercises - available on our web site - (2012-06-21)


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An introduction to file handling in programs - buffering, standard in and out, and file handles
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The Well House team - September 2010
A Melksham news roundup
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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