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Programming: short demo-files

For some programming languages, demo files are provided, which do
more or less the same thing.

First a database is written to a file.
It has 5 records and each record has 4 fields.
The script reads each line in the generated file and isolates 
the fields (items).
System calls are used to make a temporary trash file.

To test floating numbers and math functions the y=sin(x) is 
calculated for x=1:360 degrees.
Value-pairs x,y are written to a file.

to test: 
=> go to a temporary directory
=> download the dem-file with wget or from the browser
=> execute the demo

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The calculated xy-values can be plotted with gnuplot.
To plot yx-values with gnuplot:
=> download and execute the gnuplot script

wget -O dem-gnuplot.gnp https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-gnuplot.gnp
gnuplot dem-gnuplot.gnp

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#### bash shell script
wget -O dem-bash.sh https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-bash.sh
source dem-bash.sh

#### Perl
wget -O dem-perl.pl https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-perl.pl
perl dem-perl.pl

#### Python; python2 can be other version
wget -O dem-python.py https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-python.py
python2 dem-python.py

#### C
wget -O dem-c.c https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-c.c
gcc dem-c.c && ./a.out

#### Fortran-77
wget -O dem-f77.f https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-f77.f
$FORTRAN-COMPILER dem-f77.f && ./a.out

#### Pascal
wget -O dem-pas.pas https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-pas.pas
$PASCAL-COMPILER dem-pas.pas

#### Octave (Matlab); plot is included; eps- and jpg-files are written
wget -O dem-matlab.m https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-matlab.m
octave dem-matlab.m

#### lua
wget -O dem-lua.lua https://raw.githubusercontent.com/pjgsch/tools/main/tpl/dem-lua.lua
lua dem-lua.lua

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Programming: extended demo-files.

Here are some extended demo-files. 
They do not all the same things, but can be used to change and test things.

#### Perl
wget -O demext-perl.pl https://raw.githubusercontent.com/pjgsch/tools/main/tpl/demext-perl.pl
perl demdemext-perl.pl

#### C
wget -O demext-c.c https://raw.githubusercontent.com/pjgsch/tools/main/tpl/demext-c.c
wget -O IN.txt https://raw.githubusercontent.com/pjgsch/tools/main/tpl/test-txt2.txt
$C-COMPILER demext-c.c &&.a/out

#### Fortran-77
wget -O demext-f77.f https://raw.githubusercontent.com/pjgsch/tools/main/tpl/demext-f77.f
$FORTRAN77-COMPILER demext-f77.f && ./a.out


#### html
wget -O demext-html.html https://raw.githubusercontent.com/pjgsch/tools/main/tpl/demext-html.html
#### demext-html.html : open in browser

#### xfig
wget -O demext-xfig.xfig https://raw.githubusercontent.com/pjgsch/tools/main/tpl/demext-xfig.fig
#### demext-xfig.fig : open in xfig

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Documentation and command examples: open in browser

https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-bash.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-c.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-dos.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-f77.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-gnuplot.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-html.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-LO-calc.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-matlab.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-ment.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-octave.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-pas.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-pl.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-tex.txt
https://raw.githubusercontent.com/pjgsch/tools/main/tpl/doc-vi.txt

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