Perl interview answers

There is a 'ref' function that lets you know

Use: 1. the method is used only for modules (only to include .pm type file) 2. the included object are verified at the time of compilation. 3. No Need to give file extension. Require: 1. The method is used for both libraries (package) and modules 2. The included objects are verified at the run time. 3. Need to give file Extension.

'chop' functionality removes the last character completely 'from the scaler, where as 'chomp' function only removes the last character if it is a newline. by default, chomp only removes what is currently defined as the $INPUT_RECORD_SEPARATOR. whenever you call 'chomp ', it checks the value of a special variable '$/'. whatever the value of '$/' is eliminated from the scaler. by default the value of '$/' is 'n'

@solution = sort {lc $a comp lc$b } @arr.

It is a symbolic link to link one file name to a new name. so lets say we do it like file1-> file2, if we read file1, we end up reading file2.

System calls "traditionally" returns 9 when successful and 1 when it fails. system (cmd) or die "Error in command";

Perl -p -ibak -e 's/search_str/replace_str/g' filename

Use XYZ my $objref =XYZ -> new() OR, bless $objref, 'XYZ';

Pack converts a list into a binary representation. Takes an array or list of values and packs it into a binary structure, returning the string containing the structure. It takes a LIST of values and converts it into a string. The string containing a con-catenation of the converted values. Typically, each converted values looks like its machine-level representation. For example, on 32-bit machines a converted integer may be represented by a sequence of 4 bytes.

Through push() and shift() function. push adds the element at the last of array and shift() removes from the beginning of an array.

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