Hello friends,

I want to make my own C-Programs. Small ones!!!

Just like

main()
{ printf("Hello!") }

In which steps can I compile and execute my
small C-sweets??

Yours,
Bernhard

dd@hermes:~> cat > test.c
#include <stdio.h>

main()
{ printf("Hello!"); }

dd@hermes:~> gcc -o test test.c
dd@hermes:~> chmod +x test
dd@hermes:~> ./test
Hello!

why you using cat for that? I thought that cat was used to view a file and not have the ability to make changes to the file. Is htat write?

cat takes input from a file or stdin and outputs it on stdout.

The ">" operator redirects stdout from the console to a file.

Its a convienient way to get a little bit of text in to a file or to give examples involving the contents of files.

blah blah blah?!?
Ok noob here just said what my limited exsiting knowledge was telling me....

So you can, use cat to take a file and then have it make a new file containing whatever changes you wanted to make? And what it stdin and stdout, becuase this sounds like valuable info.

Well... making changes with cat by itself is very difficult.

Generally you would run it through a stream editor.

e.g.

cat myfile | sed s/this/that/ > newfile

The pipe (|) redirects stdout to the stdin of an other program, sed then replaces all instances of "this" with the word "that" and outputs it to stdout, the ">" then redirects stdout to a file called "newfile".

stdin and stdout are standard input and standard output, and are generally the keyboard and the screen respectively.

>> appends, > overwrites so you could use cat to add stuff to a file.

cat firstfile secondfile > newfile

would create a new file which was the first file followed by the second file.

cat secondfile >> firstfile

would add secondfile to the end of firstfile.

ahhh Ic now. I shall add this to my knowlegde of Linux. Thank you.

Thanks for your support!
Now I can make my small C-programs...
great!
Yours,
Bernhard