List of available command options?

Question

Do you know how to parse images by using rome parser?(java platform) I looked at some samples at rome parser documentation but it's clear. Can you provide me the sample code to parse images by using rome rss parser?

Regards Altaico

Solution 1

I think you're looking for man command.

Try doing man mkdir and look for what the -p switch does. You can use vim style searching here.

Use man man for more info on how to use man command.

Solution 2

Many commands print a brief summary of the possible options when you invoke them with --help. This won't explain in detail what the options do, but it's a good way to find the name of an option you've forgotten, or to find what options are available if you already have some basic familiarity with a command. Not all commands support --help, but I've yet to encounter a command that did any damage when run with --help, so go ahead and try. A few commands respond to -help but not to --help.

The traditional documentation utility on unix is man. For many programs, and in particular most command line utilities, run e.g. man mkdir to see a description of the command and its options.

A few commands are built into the shell. These have no man page; they are documented in the shell man page instead (man bash or man bash-builtins, if your shell is bash; man zshbuiltins if your shell is zsh). Run type COMMAND_NAME (e.g. type mkdir) to see whether a command is a builtin or an external program.

Beyond that, there may be more specific documentation. For example, the complete reference for mkdir on Linux is the coreutils manual (under mkdir).

Comments

[Jörn Horstmann]

Please add some examples ofthe rss that you want to parse, it is not entirely clear what you mean by images, an enclosure, html content or media rss.

[Admin]

In the case of mkdir, -p means "If the parent directories don't exist yet, create them too"

[Blue Cloud]

That's great, thanks! Got a feeling I'll be back here a lot over the next few days!

[Alen Milakovic]

man -k whatever is also worth trying. That does a keyword search in the man pages.

[Marc]

This is incorrect. There is a specification available for images: w3schools.com/rss/rss_tag_image.asp

[Riduidel]

@Marc Excuse me, but it seems to me your comment is not by any fashion more correct than my answer : the tag you present explains how one RSS reader can display an image for the RSS feed (like, say, a favicon for that feed), while I try to explain how to read an image embedded in one RSS entry. In other words, your comment perfectly complement my answer.