The following sends standard output to the null device (bit bucket). scriptname >/dev/null And if you also want error messages to be sent there, use one of (the first may not work in all shells): scriptname &>/dev/null scriptname >/dev/null 2>&1 scriptname >/dev/null 2>/dev/null And, if you want to record the messages, but not see them, … Read more
And a PHP example, multiple matching lines will be displayed: <?php $file=”somefile.txt”; $searchfor=”name”; // the following line prevents the browser from parsing this as HTML. header(‘Content-Type: text/plain’); // get the file contents, assuming the file to be readable (and exist) $contents = file_get_contents($file); // escape special characters in the query $pattern = preg_quote($searchfor, “https://stackoverflow.com/”); // … Read more
You must either use: echo ‘I love my ‘ . $variable . ‘.’; This method appends the variable to the string. Or you could use: echo “I love my $variable.”; Notice the double quotes used here!
I’m going to give a completely non-technical answer on this one. Let’s say that there is a girl named Sally Function. You want to know if she likes you or not. So since you’re in grade school you decide to pass Sally a note (call the function with parameters) asking her if she likes you … Read more
Why two constructs? The truth about print and echo is that while they appear to users as two distinct constructs, they are both really shades of echo if you get down to basics, i.e. look at the internal source code. That source code involves the parser as well as opcode handlers. Consider a simple action … Read more
Single quotes will not parse PHP variables inside of them. Either use double quotes or use a dot to extend the echo. $variableName=”Ralph”; echo ‘Hello ‘.$variableName.’!’; OR echo “Hello $variableName!”; And in your case: $i = 1; echo ‘<p class=”paragraph’.$i.'”></p>’; ++i; OR $i = 1; echo “<p class=”paragraph$i”></p>”; ++i;
<? and <?= are called short open tags, and are not always enabled (see the short_open_tag directive) with PHP 5.3 or below (but since PHP 5.4.0, <?= is always available). Actually, in the php.ini-production file provided with PHP 5.3.0, they are disabled by default: $ grep ‘short_open’ php.ini-production ; short_open_tag short_open_tag = Off So, using … Read more
What you see is the expected behaviour. The trouble is that the parent shell evaluates $SOMEVAR on the command line before it invokes the command with the modified environment. You need to get the evaluation of $SOMEVAR deferred until after the environment is set. Your immediate options include: SOMEVAR=BBB eval echo zzz ‘$SOMEVAR’ zzz. SOMEVAR=BBB … Read more
Variables are expanded in double quoted strings, but not in single quoted strings: $ name=World $ echo “Hello $name” Hello World $ echo ‘Hello $name’ Hello $name If you can simply switch quotes, do so. If you prefer sticking with single quotes to avoid the additional escaping, you can instead mix and match quotes in … Read more
You can use: printf ‘=%.0s’ {1..100} How this works: Bash expands {1..100} so the command becomes: printf ‘=%.0s’ 1 2 3 4 … 100 I’ve set printf’s format to =%.0s which means that it will always print a single = no matter what argument it is given. Therefore it prints 100 =s.