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You'll make most changes to xmh with resource entries; Section Changing How Commands Work explains that. This section explains xmh command-line options.
As explained in the Chapter Key Parts of the UNIX Filesystem, MH keeps messages, folders, and other files in a directory. By default, xmh looks for a subdirectory named Mail in your home directory. You can change that by changing the Path: entry in your MH profile. Or, you can use the -path option to xmh (but see the NOTE in the Section Conflicts Between xmh and MH Customization). For example, to use a directory named .Mail (the dot at the start of the directory name hides the directory from the ls command), you might start xmh this way:
xmh -path /xxx/yyy/.Mail &where /xxx/yyy is your home directory.
NOTE: As explained in Section Sharing Other Users' Folders, everyone in a group can share an MH directory if they have UNIX filesystem permission to read and write to the directory. But this might not be a good idea with xmh, because xmh keeps a "snapshot" of each folder in a hidden file named .xmhcache. If one xmh user changes the contents of a folder (packing it, moving messages, and so on) the other user won't see the changes until xmh rebuilds its .xmhcache file -- or the user selects Rescan Folder.
Worse, if a folder isn't writable, you can mark messages for deletion, copying, and so on -- when you use Commit Changes, xmh gives you an error but can also update the table of contents to show that the changes have been made!
The Rescan Folder command will usually get you back to reality. But, if you need to use unwritable folders, think about using MH instead.
Normally, xmh begins with a view of your inbox folder. You can change that with the -initial command-line option. For instance, to start with your project folder, use a line such as:
xmh -initial project &
Because xmh is built with the X Toolkit, it recognizes standard toolkit command-line options. For a complete list, see your online X(1) manual page.
Here are a few of the options:
Figure: Old-fashioned xmh -flag mailbox icons
xmh -bw 15 &sets a 15-pixel-wide border.
xmh -fg red -bg navyblue -bd yellow &
xmh -xrm '*PickGeometry:600x450' &
xmh -xrm '*font: 6x9'
xmh -display :0.1 -xrm '*PickGeometry:600x450' -xrm '*HideBoringHeaders:off' &