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file read and write - line by line
Input / Output example from a Well House Consultants training course
More on Input / Output [link] Source code: flapper Module: U110
--[[ This program opens a file and reads and writes it line by line ]] -- Open a file for read an test that it worked fh,err = io.open("requests.xyz") if err then print("OOps"); return; end -- Open a file for write fho,err = io.open("requests.new","w") -- line by line while true do line = fh:read() if line == nil then break end print (line) if string.find(line,"Python") then fho:write(line) fho:write("\n") end end -- Following are good form fh:close() fho:close() -- removes any file called test.bak print (os.remove("test.bak") and "File removed" or "No action") --[[ ---------- Sample Output ------------------------------- [trainee@easterton u110]$ lua flapper antonia Perl XML PHP Tcl/Tk MySQL barbara Tcl/Tk ASP Ruby Java cherry Perl Java Ruby MySQL delia XML PHP Java ASP ethel MySQL Perl Tcl/Tk ASP florence Ruby PHP Java ASP gloria XML Perl Tcl/Tk MySQL hazel PHP Python Perl Ruby ASP iris Perl MySQL Java Tcl/Tk jenny XML Perl Ruby ASP kerry Perl Tcl/Tk Ruby MySQL leane PHP Python ASP Perl Java margaret XML Perl Ruby MySQL Tcl/Tk nina Tcl/Tk Perl ASP Ruby olivia MySQL Python ASP PHP petra XML Tcl/Tk ASP Perl Ruby queenie Ruby Perl ASP MySQL rita PHP ASP Ruby Perl sally Tcl/Tk Perl XML MySQL tina Tcl/Tk Ruby Java uva MySQL Perl Java PHP venus Java Perl Ruby ASP wendy Perl Tcl/Tk ASP MySQL xena Java Perl PHP ASP XML yollanda Ruby MySQL Tcl/Tk zoe Ruby ASP Perl PHP adam Tcl/Tk Perl Python MySQL barry Python XML Java Perl PHP charles Perl Ruby MySQL Tcl/Tk david Perl Tcl/Tk Java ed Ruby Perl Java PHP fred MySQL Perl Java XML graham Java Perl Tcl/Tk harry PHP Python Java ivan Ruby Java Perl Tcl/Tk MySQL john PHP XML Java Perl ken Tcl/Tk Python Java Perl len Perl Java MySQL Ruby morris Perl Java PHP Tcl/Tk nigel PHP Python Java Perl orpheus MySQL Ruby Tcl/Tk XML peter PHP Java Perl quentin Tcl/Tk Perl PHP Ruby rupert Java Python MySQL steve Tcl/Tk Perl PHP Ruby tommy Perl Java XML ulsyees Java PHP Perl victor Ruby Perl Tcl/Tk MySQL william Ruby Perl PHP xavier PHP Java Perl yuri XML PHP Perl Tcl/Tk zachary MySQL Java Tcl/Tk No action [trainee@easterton u110]$ ]] Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Lua * Lua Programming * Lua Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Input / Output" training module. You'll find a description of the topic and some
other closely related examples on the "Input / Output" module index page.
Full description of the source code
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