"file names are same ; and i did cwd , it still says the same error ."

There were no replies when I started composing my response. My post was not related to Athanasius' post nor your 'hey it says "permission denied "'.

"i was hoping is there any command that brings us to the current directory ?"

That would be chdir — follow the link I posted above.

"and if anyone can please state what could be the reason for permission deniale"

That would depend on your OS. On *nix, it usually means you don't have write access to either the directory or the specific file.

Your questions suggest you're unfamiliar with the OS you're working on. I'd recommend seeking advice from the system administrator.

I am working on windows xp

If it's a temporary file you created in that program, then I'm guessing you still have the file open.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

#!/usr/bin/perl --
use strict;
use warnings;

Main( @ARGV );
exit( 0 );

sub Fudge {
    use Errno();
    join qq/\n/,
      "Error @_",
      map { "  $_" } int( $! ) . q/ / . $!,
      int( $^E ) . q/ / . $^E,
      grep( { $!{$_} } keys %! ),
      q/ /;
}

sub Main {
    for my $unfile ( 'NUL', './..', 'XYZQQQQQQQQQ', ){
        unlink $unfile or warn Fudge( $unfile );
    }
}
__END__
Error NUL
  22 Invalid argument
  87 The parameter is incorrect
  EMARCH_ENC_I17_IMM41a_VAL_POS_X
  EMR_SETTEXTALIGN
  EVENT_SYSTEM_MINIMIZESTART
  ERROR_BAD_COMMAND
  EINVAL
    at - line 20.
Error ./..
  22 Invalid argument
  5 Access is denied
  EMARCH_ENC_I17_IMM41a_VAL_POS_X
  EMR_SETTEXTALIGN
  EVENT_SYSTEM_MINIMIZESTART
  ERROR_BAD_COMMAND
  EINVAL
    at - line 20.
Error XYZQQQQQQQQQ
  2 No such file or directory
  2 The system cannot find the file specified
  ETO_OPAQUE
  ERROR_LABEL_QUESTIONABLE
  EDS_RAWMODE
  EWX_REBOOT
  EC_QUERYWAITING
  EIMES_CANCELCOMPSTRINFOCUS
  ENOENT
  ELEMENT_STATUS_IMPEXP
  ENABLE_WRAP_AT_EOL_OUTPUT
  ES_RIGHT
  EV_RXFLAG
  ERROR_FILE_NOT_FOUND
  EVENTLOG_WARNING_TYPE
  EVENPARITY
  ENOFILE
  ESB_DISABLE_RTDN
  EMARCH_ENC_I17_IMM41c_INST_WORD_X
  EEInfoNextRecordsMissing
  ES_DISPLAY_REQUIRED
  ESB_DISABLE_RIGHT
  EVENT_MODIFY_STATE
  EMR_POLYBEZIER
  ENABLE_LINE_INPUT
  EVENT_SYSTEM_ALERT
  EXCEPTION_UNWINDING
  EC_RIGHTMARGIN
  EVENTLOG_END_PAIRED_EVENT
  EXTEND_IEPORT
  ExceptionNestedException
  ESB_DISABLE_DOWN
  EVENTLOG_SEEK_READ
    at - line 20.
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