Why can't a non-root user do this?
$ dd if=/dev/zero of=img bs=1024k count=1 $ mke2fs -F img $ mkdir mnt $ mount -t ext2 -o loop img mnt $
That's (IIUC) the standard way to create an initial ram disk for the linux kernel (as documented in eg its Documentation/initrd.txt).
mkcramfs OTOH doesn't require root privileges; any user can run that program to produce a cramfs image from a directory of its contents.
(But the existence of that tool seems to be a result of the fact that cramfs as a filesystem is readonly, so the above method doesn't work -- you can't create any content in the empty filesystem, because it's readonly -- so they were forced to make a separate tool. I'm not aware of corresponding tools for other filesystems. It's too bad the general method above doesn't work for non-root users. It seems unfortunate that just "mounting" a file to see what's packaged up in it -- that's what a filesystem image is, it's basically just like a ".tar.gz" file isn't it? -- why should that be a security risk?)
two-column xterm (and emacs)
Sometimes "top" output is more lines than fit in an xterm on my screen. But I have width enough for another xterm next to it. I'd like a "two-column" xterm so that the second xterm is treated as a vertical extension of the first one.
I'd also like the same thing in Emacs, where I split the screen down the middle (C-x 3) but the right half is a second column extending the buffer on the left half.
Googling "two-column xterm" came up empty.
(Actually I'm running gnome-terminal, not xterm. But varying the search terms doesn't seem to help.)
I wonder about Emacs. Someone has probably implemented what I want for Emacs, right?! Hmm. Looking at "apropos column" results ... "2C-two-columns" sounded promising but I wasn't able to get it to do anything useful. Reading some more docs I see it's meant for editing files with two columns of text. But I just want to display (and scroll and edit) a regular "single column" text file (buffer, really) using *more* than one column, continuing the text from the bottom of one column at the top of the next column (and so on, with three or more columns.)
Hmm... If I had the two-column xterm (gnome-terminal, whatever) presumably I could *run* Emacs in it and it would Just Work and I'd have my two-column Emacs display. But window-splitting would be kinda weird... Hmm...
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