Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You are mixing the two concepts of arguments and piping.</p> <p>The parameters that you specify in the <code>main</code> function handles arguments, not piping.</p> <p>The "pipe" character <code>|</code> is used to do piping, and that doesn't affect the arguments, it affects the input and output stream. The <code>&lt;</code> and <code>&gt;</code> can be used to pipe from and to a file.</p> <p>What you append after a program call is arguments, example:</p> <pre><code>progam.exe arg1 arg2 arg3 </code></pre> <p>These will be parsed by the bolerplate code in the program, and end up in the <code>argv</code> array when the <code>main</code> function is called.</p> <p>When you use the <code>&lt;</code> character to pipe a file into a program, the content of the file will be sent to the input stream of the program:</p> <pre><code>program.exe &lt; data.txt </code></pre> <p>The program will not have console input (screen and keyboard), instead it's fed data from the file.</p> <p>When you use the <code>&gt;</code> character to pipe to a file, the output of the program goes to the file instead of the console. Example:</p> <pre><code>program.exe &gt; result.txt </code></pre> <p>When you use the <code>|</code> character to pipe from one program to another, the output stream of the first program is the input stream of the other program. Example:</p> <pre><code>program.exe | sort.exe </code></pre> <p>Everything that the first program writes to the output stream goes into the input stream of the other program. If you don't specify any input or output files, the first program has console input, and the second program has console output. So, the data flows through the two programs like this:</p> <pre><code>[console] --&gt; [program.exe] --&gt; [sort.exe] --&gt; [console] </code></pre> <p>You can pipe several programs, so that the data flows from the first program to the last. Example:</p> <pre><code>program.exe | sort.exe | more.exe </code></pre> <p>The data then flows throught all three programs:</p> <pre><code>[console] --&gt; [program.exe] --&gt; [sort.exe] --&gt; [more.exe] --&gt; [console] </code></pre> <p>(The <code>.exe</code> extension is normally not needed when specifying a program, I just included it here to distinguish clearly between programs, arguments and files.)</p>
    singulars
    1. This table or related slice is empty.
    1. POOn the lack of "int main(int argc, char* argv[])" knowledge
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USGuffa
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POOn the lack of "int main(int argc, char* argv[])" knowledge
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COGood answer- is it worth adding, for the benefit, that getting input from the input stream can be done with `scanf`, and the way to send output to the output stream is with `printf`
      singulars
      1. PO
      1. USSanjay Manohar
    2. COAlso, it's important to realize that these operators (<, > and |) are all implemented by the shell in typical environments, the actual program binary doesn't have to do anything and is in fact not aware of the operators being used, typically. They don't appear in `argv[]`.
      singulars
      1. PO
      1. USunwind
    3. COThat helped a lot Guffa. Now I know what it stands for. Nevertheless I just tried another thing and I still don't get what I need. I just edit the post. I don't want to read, i want to "throw" stuff to the program.
      singulars
      1. PO
      1. USstringparser
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload