Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

lrange(3tcl)


NAME

   lrange - Return one or more adjacent elements from a list

SYNOPSIS

   lrange list first last
______________________________________________________________________________

DESCRIPTION

   List  must  be  a  valid Tcl list.  This command will return a new list
   consisting of elements first through last, inclusive.  The index values 
   first and last are interpreted the same as index values for the command 
   string index, supporting simple index arithmetic and  indices  relative 
   to  the  end of the list.  If first is less than zero, it is treated as
   if it were zero.  If last is greater than or equal  to  the  number  of
   elements  in  the list, then it is treated as if it were end.  If first
   is greater than last then an empty string is returned.   Note:  "lrange
   list  first  first"  does not always produce the same result as "lindex
   list first" (although it often does for  simple  fields  that  are  not
   enclosed in braces); it does, however, produce exactly the same results
   as "list [lindex list first]"

EXAMPLES

   Selecting the first two elements:
          % lrange {a b c d e} 0 1
          a b

   Selecting the last three elements:
          % lrange {a b c d e} end-2 end
          c d e

   Selecting everything except the first and last element:
          % lrange {a b c d e} 1 end-1
          b c d

   Selecting a single element with lrange is not the same as doing so with
   lindex:
          % set var {some {elements to} select}
          some {elements to} select
          % lindex $var 1
          elements to
          % lrange $var 1 1
          {elements to}

SEE ALSO

   list(3tcl),  lappend(3tcl), lindex(3tcl), linsert(3tcl), llength(3tcl),
   lsearch(3tcl), lset(3tcl), lreplace(3tcl), lsort(3tcl), string(3tcl)

KEYWORDS

   element, list, range, sublist



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner