can you lease give me explanation of these commands .
Code:
$Program = $0 ; $Program =~ s/.*\/// ;
$MyDir = $0 ; $MyDir =~ s/[^\/]*$// ;
what does these lines mean "~ s/.*\/// " ,"~ s/[^\/]*$// " ?
use DBI;
use DBD::Oracle qw(:ora_types);
use File::Copy;
what does above lines refer to ?
Code:
if ( defined ( $opt_v ) )
what does this mean?
Last edited by zaxxon; 09-11-2013 at 04:09 AM..
Reason: changed icode to code
s/.*\/// - replaces everything in front of / with nothing s/[^\/]*$// - replaces the characters in between the last / and the end of the string with nothing
what does these lines mean "~ s/.*\/// " ,"~ s/[^\/]*$// " ?
This is a substitute command similar to sed on the unix shell. s/.*\/// --> delete all the characters in $Program variable from the beginning till the last occurrence of '/' (rather it substitutes the characters from the beginning till the last occurrence of '/' with nothing)
s/[^\/]*$// --> delete all the characters in $Mydir from the last occurrence of '/' till the end (substitute the characters from the last occurrence of '/' till the end with nothing).
To give a better picture these two 's' commands work similar to "basename" and "dirname" utilities in unix.
Quote:
Code:
use DBI;
use DBD::Oracle qw(:ora_types);
use File::Copy;
what does above lines refer to ?
You're asking the perl compiler to use these modules (load these modules) so that the sub-routines in these modules can be used in your current program. You may want to read more about modules in perl.
Quote:
Code:
if ( defined ( $opt_v ) )
what does this mean?
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