Make 'cat' default to '.' (cwd) instead of requiring argument

Improve command descriptions

Streamline %cmd_map %cmd_map was previously a hash containing: { real_function => alias_function, ... } Now the structure of the hash is: { alias_or_real_func => [ real_func/if_any, autocompleter_func ], ... } This allows for a more streamlined definition of commands and aliases, and makes it possible to keep all data in %cmd_map instead of having additional special cases.

Improve 'help' command POD documentation has been modified to list available shell commands using =head2 instead of =item. This, combined with run_help() modified to accept arguments, allows one to use 'help <command name>' to get help for a specific command, similar/equal to getting help for shell builtins in regular shells. E.g.: help cat help list

Fix precedence of command line arguments Previously, when autogenerating the config file, the name of config itself was included in the YAML contents. This in turn caused the config file to be re-parsed again and any command line arguments were overwritten with values from the config file. Now the name of config file is not dumped if it is equal to the file being written, and the config file is not reparsed if it is the same file.

Allow default attributes to be set via config and cmdline This commit changes the default attribute list from a fixed '*' to a configurable list, defaulting to ['*']. It allows one to use config file or command line to set default attributes to retrieve and display - i.e. to set default attributes to '+' or to a list of multiple specific attributes. Printing or changing this value through env/setenv is currently not supported because env/setenv only work properly with string values while attributes is a list.

merge