There are some commands that take file name and there are some case where you need to give file name. But there are some cases where you want to modify the file before passing it to the command. What …

<td> <div class="text codecolorer"> $ $ awk \'{printf "select * from table where id = %c%s%c;\\n",39,$1,39; }\' inputfile.txt </div> </td> </tr> …

You want to learn about Linux, start from learning what not to do. <a href="http://www.junauza.com/2008/11/7-deadly-linux-commands.html" target="_blank">Here is one for the …