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Top Forums UNIX for Beginners Questions & Answers Finding Files with Perl on a Hidden Dir? Post 302976444 by LinQ on Wednesday 29th of June 2016 10:47:19 AM
Old 06-29-2016
Thank you, Aia, for posting! Sorry for the confusion...

Here's the program flow which I am seeking to achieve with my crude little snippet:
  1. Begin by printing the word "starting" to the terminal.
  2. Check ~/.somedir using while() to see if the file "testFile" is present.
  3. If it is, send the phrase "file detected" to the terminal; and loop back again to check if "testFile" is still present after a 1-second timeout.
  4. If "testFile" doesn't exist on ~/.somedir, print the phrase "file missing" to the terminal and exit.
Not too exciting; but I think it about encapsulates what I need to do Smilie

To this end, I have formed three different while() statements to interchangeably fit into the main script code:
Code:
  1. while (`wc -l ~/.somedir/testFile | sed -e 's/ \/.*$//'` eq "0")
  2. while (`ls -a ~/.somedir | grep -e \"testFile\"` eq "testFile")
  3. while (-e "~/.somedir/testFile")

The commandlines from 1) and 2) both work well as stand-alone code at the terminal; but do not execute properly from Perl. #2 is particularly well-suited to the work; as it doesn't rely upon the file being of any particular size to allow for successful detection. String comparisons should logically work as expected in this context.

Choice #3 is preferred as a straightforward solution; but, unfortunately, Perl will not find our "testFile" on a hidden directory such as ~/.somedir using the normal
Code:
while (-e "~/.somedir/testFile")

statement layout.

So, that's the problem in a nutshell...

Again, I'd prefer going with the straight-Perl approach which #3 offers. But, if making this work is more complicated than getting the commandline in
Code:
while (`ls -a ~/.somedir | grep -e \"testFile\"` eq "testFile")

to function correctly in this code context, I'll settle for a just "quick fix" of #2 for now.

Thanks again!
 

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ost::Dir(3)						     Library Functions Manual						       ost::Dir(3)

NAME
ost::Dir - A low level portable directory class. SYNOPSIS
#include <file.h> Inherits ost::File. Public Member Functions Dir (const char *name=NULL) void open (const char *name) void close (void) virtual ~Dir () const char * getName (void) const char * operator++ () const char * operator++ (int) const char * operator* () bool rewind (void) bool operator! () bool isValid (void) Static Public Member Functions static bool create (const char *path, Attr attr=attrGroup) static bool remove (const char *path) static bool setPrefix (const char *path) static bool getPrefix (char *path, size_t size=256) Additional Inherited Members Detailed Description A low level portable directory class. Used to support ccstd Directory container. This provides a basic mechanism for allocating and accessing file entries. Author: David Sugar dyfet@ostel.com low level directory access class. Constructor &; Destructor Documentation ost::Dir::Dir (const char *name = NULL) virtual ost::Dir::~Dir () [virtual] Member Function Documentation void ost::Dir::close (void) static bool ost::Dir::create (const char *path, Attrattr = attrGroup) [static] const char* ost::Dir::getName (void) static bool ost::Dir::getPrefix (char *path, size_tsize = 256) [static] bool ost::Dir::isValid (void) void ost::Dir::open (const char *name) bool ost::Dir::operator! () [inline] const char* ost::Dir::operator* () const char* ost::Dir::operator++ () [inline] const char* ost::Dir::operator++ (int) [inline] static bool ost::Dir::remove (const char *path) [static] bool ost::Dir::rewind (void) static bool ost::Dir::setPrefix (const char *path) [static] Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 ost::Dir(3)
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