help [command [subcommand]|expression]
Without argument, print the list of available debugger commands. a When an argument is given, it is first checked to see if it is command name. For example, help backtrace gives help on the backtrace debugger command.
help backtrace
backtrace
Some commands like info, set, and show can accept an additional subcommand to give help just about that particular subcommand. For example help info line gives help about the info line command.
info
set
show
help info line
info line
To install Devel::Trepan, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Devel::Trepan
CPAN shell
perl -MCPAN -e shell install Devel::Trepan
For more information on module installation, please visit the detailed CPAN module installation guide.