Perl: How to check if there is something being piped in

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xed

xed(1)							    BSD General Commands Manual 						    xed(1)

NAME

     xed -- Xcode text editor invocation tool.

SYNOPSIS

     xed [-xcwrbhv] [-l lineno] [file ...]

DESCRIPTION

     The xed tool launches the Xcode application and opens the given documents, or opens a new untitled document, optionally with the contents of
     standard in.

OPTIONS

     The options for xed are similar to those for the command-line utiltiies for other text editors:

     -x, --launch
	      Launches Xcode opening a new empty unsaved file, without reading from standard input.

     -c, --create
	      Creates any files in the file list that do not already exist.  If used without --launch, standard input will be read and piped to
	      the last file created.

     -w, --wait
	      Wait for the files to be closed before exiting.  xed will idle in a run loop waiting for a notification from Xcode when each file is
	      closed, and will only terminate when all are closed.  This is useful when invoking it from a script.

     -l, --line <number>
	      Selects the given line in the last file opened.

     -b, --background
	      Opens Xcode without activating it; the process that invoked xed remains in front.

     -h, --help
	      Prints a brief summary of usage.

     -v, --version
	      Prints the version number of xed

     [file...]
	      A list of file paths.  Existing files will be opened; nonexistent files will be created only if the --create flag is passed.  If no
	      files are passed, then standard input will be read and piped into a new untitled dcument (unless --launch is passed).  If --create
	      and at least one nonexistent file name is passed, the last nonexistent file will be created, filled with the standard input, and
	      opened.

HISTORY

     xed was introduced in Mac OS X 10.5 with Xcode 3.0.

Mac OS								   June 1, 2019 							    Mac OS

Shell Programming and Scripting