Write syntax to use grep function?

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What is 'rollback' command in perl?

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How to replace perl array elements?

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how to find a substring in a string without using substr built in functions, and print the substring found

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How do you match one letter in the current locale?

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while(my($key, $value) = each(%hash) ) { print "$key => $value\n"; } my($key, $value); while(($key, $value) = each(%hash) ) { print "$key => $value\n"; } What is the different between these two code in case of "my" usage ?

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what is Perl one liner?

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you are required to replace a char in a string and store the number of replacements. How would you do that?

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What is the use of –w?

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How to make the following assignment, as arrayreference assignment ? my $arr_ref='[1,2,3,4,4,'elem']';

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Where the command line arguments are stored and if you want to read command-line arguments with Perl, how would you do that?

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Assuming both a local($var) and a my($var) exist, what's the difference between ${var} and ${"var"}?

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