CONGRATULATIONS! Your OpenBSD install has been successfully completed! When you login to your new system the first time, please read your mail using the 'mail' command.
Oh, no!
You have a fresh install
and the only way to read
your welcome message from Theo
requires using
mail.
chroot SFTP accounts
For
$DAYJOB
I had to create user accounts for customers
and give them access to
SFTP
files to/from secured areas of our server.
We wanted to use
chroot
functionality to ensure
that no customer could see other customers' data,
and prevent them from poking around
potentially sensitive areas of the server.
After a bit of trial-and-error,
I've listed the lessons-learned here
in a cook-book fashion
so that in case I ever have to do it again,
I have the steps documented.
This post was spurred to exist thanks to this Reddit post asking about creating an encrypted FTP server on OpenBSD so my reply there became the basis for this post.
Sometimes you want to turn some text
into "sarcastic Spongebob" text
so this little fragment of
awk
will make that transformation for you:
#!/usr/bin/awk -f
BEGIN { srand() }
{
n = split($0, a, //)
for (i=1; i<=n; i++) {
c=a[i]
printf("%c", rand() < 0.5 ? toupper(c) : tolower(c))
}
print ""
}
I wanted to do some full-justification of text.
So a little
awk
later,
I could set the desired width
and pipe to justify it.
#!/usr/bin/awk -f
BEGIN {c = "COLUMNS" in ENVIRON ? ENVIRON["COLUMNS"] : 80}
{
if (NF > 1) {
s = $0
wc = split(s, a)
gsub(FS, "", s)
totalfill = c - length(s)
fill = totalfill / (wc - 1)
intfill = int(fill)
errdelta = fill - intfill
err = 0.5
printf("%s", a[1])
for (i=2; i<=length(a); i++) {
width = intfill
err += errdelta
if (err >= 1) {
++width
err -= 1
}
printf("%*s%s", width, " ", a[i])
}
printf("\n")
} else print
}
Most Linux, BSD, MacOS machines
come with
/usr/share/dict/words
so a little
awk,
grep,
and other shell utilities
can find some interesting words.
Our daughter wanted to
"freeze dance"
(music plays,
stopping at random intervals,
at which the dancing kids freeze in place
until the music resumes).
So what is a geek dad to do?
Load up a playlist of kids' music in
cmus,
start playing the music,
and let the shell randomly freeze and resume the music
while true ; do sleep $(( $RANDOM % 15 + 5)) ; cmus-remote -u ; sleep 4; cmus-remote -u ; done
This does as
sleep
for some random interval between
5
and
20
seconds, then does as
sleep
for
4
seconds before unpausing the music.
You could do something similar with
mpd/mpc
if you prefer them.