Linux test command Post: 53443

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Operating Systems Linux Linux test command Post 53443 by Ygor on Thursday 15th of July 2004 06:23:35 AM

07-15-2004

Registered User

Another way to test for files

Code:

if ls /home/pv/T20* >/dev/null 2>&1
then
    echo true
fi

However, this would return true for directories and empty files. Since you want to do some processing on the files why not use a for loop...

Code:

for file in $(ls /home/pv/T20*)
do
   [ -s $file ] || continue
   echo do something with $file
   :
done

If there are no files then the code within the for loop is not executed and this message is sent to standard error: "/home/pv/T20* not found"

PS: It is not good practice to rely on "if test -f" for multiple files. Here's why (on HP-UX)....

$ ls *.txt
b.txt c.txt
$ if test -f *.txt
> then
> echo true
> else
> echo false
> fi
true
$ mkdir a.txt
$ if test -f *.txt
> then
> echo true
> else
> echo false
> fi
false

Ygor

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LEARN ABOUT PHP

ziparchive.open

ZIPARCHIVE.OPEN(3)							 1							ZIPARCHIVE.OPEN(3)

ZipArchive::open - Open a ZIP file archive

SYNOPSIS

       mixed ZipArchive::open (string  $filename, [int	$flags])

DESCRIPTION

	Opens a new zip archive for reading, writing or modifying.

PARAMETERS

	      o $filename
		- The file name of the ZIP archive to open.

	      o $flags
		- The mode to use to open the archive.

		     o ZipArchive::OVERWRITE

		     o ZipArchive::CREATE

		     o ZipArchive::EXCL

		     o ZipArchive::CHECKCONS

RETURN VALUES

	      o $Error codes
		- Returns TRUE on success or the error code.

		     o ZipArchive::ER_EXISTS File already exists.

		     o ZipArchive::ER_INCONS Zip archive inconsistent.

		     o ZipArchive::ER_INVAL Invalid argument.

		     o ZipArchive::ER_MEMORY Malloc failure.

		     o ZipArchive::ER_NOENT No such file.

		     o ZipArchive::ER_NOZIP Not a zip archive.

		     o ZipArchive::ER_OPEN Can't open file.

		     o ZipArchive::ER_READ Read error.

		     o ZipArchive::ER_SEEK Seek error.

EXAMPLES

       Example #1

	      Open and extract

	      <?php
	      $zip = new ZipArchive;
	      $res = $zip->open('test.zip');
	      if ($res === TRUE) {
		  echo 'ok';
		  $zip->extractTo('test');
		  $zip->close();
	      } else {
		  echo 'failed, code:' . $res;
	      }
	      ?>

       Example #2

	      Create an archive

	      <?php
	      $zip = new ZipArchive;
	      $res = $zip->open('test.zip', ZipArchive::CREATE);
	      if ($res === TRUE) {
		  $zip->addFromString('test.txt', 'file content goes here');
		  $zip->addFile('data.txt', 'entryname.txt');
		  $zip->close();
		  echo 'ok';
	      } else {
		  echo 'failed';
	      }
	      ?>

PHP Documentation Group 													ZIPARCHIVE.OPEN(3)