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Full Discussion: What is the meaning the $ special character?
Top Forums UNIX for Beginners Questions & Answers What is the meaning the $ special character? Post 303006519 by dakelly on Friday 3rd of November 2017 05:14:19 AM
Old 11-03-2017
Bodisha,

The best way I like to remember it is that it is a marker to show a variable.

for instance this is my PS1
Code:
HOST=`hostname`
PS1='$LOGNAME@$HOST: $PWD>

PS1 = (the following)
$LOGNAME is the variable LOGNAME that holds my login name
$HOST is the variable that holds the hostname of the server
$PWD is the variable that holds the current (print) working directory
so if I want to echo this PS1 out to see what it looks like I would use:
Code:
dk@server: /home/dk> echo $PS1
$LOGNAME@$HOST: $PWD>
dk@server: /home/dk>

hope this helps
 

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LEARN ABOUT PHP

apd_breakpoint

APD_BREAKPOINT(3)							 1							 APD_BREAKPOINT(3)

apd_breakpoint - Stops the interpreter and waits on a CR from the socket

SYNOPSIS

       bool apd_breakpoint (int  $debug_level)

DESCRIPTION

	This  can be used to stop the running of your script, and await responses on the connected socket. To step the program, just send enter (a
       blank line), or enter a php command to be executed.

PARAMETERS

	      o $
		debug_level -An integer which is formed by adding together the XXX_TRACE constants.It is not recommended to use  MEMORY_TRACE.	It
		is  very  slow and does not appear to be accurate.  ASSIGNMENT_TRACE is not implemented yet.To turn on all functional traces (TIM-
		ING, FUNCTIONS, ARGS SUMMARY (like strace -c)) use the value 99

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Typical session using tcplisten

	      bash#tcplisten localhost 7777

	      APD - Advanced PHP Debugger Trace File
	      ---------------------------------------------------------------------------
	      Process Pid (6118)
	      Trace Begun at Sun Mar 10 23:13:12 2002
	      ---------------------------------------------------------------------------
	      (  0.000000): apd_set_session_trace called at /home/alan/Projects/project2/test.
	      php:5
	      (  0.074824): apd_set_session_trace_socket() at /home/alan/Projects/project2/tes
	      t.php:5 returned.  Elapsed (0.074824)
	      (  0.074918): apd_breakpoint() /home/alan/Projects/project2/test.php:7
			    ++ argv[0] $(??) = 9
	      apd_breakpoint() at /home/alan/Projects/project2/test.php:7 returned.  Elapsed (
	      -2089521468.1073275368)
	      >

	      statement: /home/alan/Projects/project2/test.php:8
	      >

	      statement: /home/alan/Projects/project2/test.php:8
	      >

	      statement: /home/alan/Projects/project2/test.php:10
	      >apd_echo($i);
	      EXEC: apd_echo($i);
	      0
	      >apd_echo(serialize(apd_get_active_symbols()));
	      EXEC:  apd_echo(serialize(apd_get_active_symbols()));
	      a:47:{i:0;s:4:"PWD";i:1;s:10:"COLORFGBG";i:2;s:11:"XAUTHORITY";i:3;s:14:"
	      COLORTERM_BCE";i:4;s:9:"WINDOWID";i:5;s:14:"ETERM_VERSION";i:6;s:16:"SE
	      SSION_MANAGER";i:7;s:4:"PS1";i:8;s:11:"GDMSESSION";i:9;s:5:"USER";i:10;s:5:"
	      MAIL";i:11;s:7:"OLDPWD";i:12;s:5:"LANG";i:13;s:10:"COLORTERM";i:14;s:8:"DISP
	      LAY";i:15;s:8:"LOGNAME";i:16;s:6:"
	      >apd_echo(system('ls /home/mydir'));
	      >apd_continue(0);

PHP Documentation Group 													 APD_BREAKPOINT(3)
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