perl code doubt

[siva rajesh]

what is the meaning of

my $DIRDEPTH = "..\\..\\..";

what is the meaning of \\ and .. in perl?

thank you
Rajesh

 

[Brian Wakem]

what is the meaning of

my $DIRDEPTH = "..\\..\\..";

what is the meaning of \\ and .. in perl?

thank you
Rajesh

\

 

[Paul Lalli]

Subject: perl code doubt

Please put the subject of your post in the Subject of your post. Your
post is not about doubting perl code. Your post is about '\\' and '..'

what is the meaning of

my $DIRDEPTH = "..\\..\\..";

what is the meaning of \\ and .. in perl?

In a normal string, .. has no special meaning of any kind. Those are
simply two periods.

The \ is a special character. It starts an escape sequence. It makes
non-special characters special (for example, a \n means "newline"). It
also makes special characters non-special. In this case, the first \
is used to make the second \ non-special. Therefore, "\\" simply means
a single backslash.

The above string looks to be a directory location, going three levels
up from the current directory.

If you post some more context, we can probably help you figure out what
the specific chunk of code is actually doing.

Paul Lalli

 

[John W. Krahn]

what is the meaning of

my $DIRDEPTH = "..\\..\\..";

what is the meaning of \\ and .. in perl?

Everything between quotes (") are string characters. The \ character is
special in a double quoted string in that it and the character following
it represent either a meta-character ( \n, \t, \b, etc. ) or the
character itself.

perldoc perlop


John

 

[Tintin]

what is the meaning of

my $DIRDEPTH = "..\\..\\..";

what is the meaning of \\ and .. in perl?

same as writing

my $DIRDEPTH = '..\..\..';

 

[Big and Blue]

The above string looks to be a directory location, going three levels
up from the current directory.

Only on MS Windows.

On Unix it would refer to an entry called '..\..\..', which is a valid,
albeit unusual, filename.

It might be better written as:

my $DIRDEPTH = "../../..";

which would refer to 3-levels up on Windows, Unix (and MacOSX), and avoid
the reader having to work out that "\\" is actually '\'.