Create key for specific purpose or other user:

ssh-keygen -f keybasename -C "user@host"

Encrypt:

gpg --encrypt -r keyid --armor < inputfile -o outputfile

Decrypt:

gpg --decrypt filename

List keys:

gpg --list-options "show-keyring" [--list-keys|--list-secret-keys]

Create key:

gpg --full-generate-key

Import keys:

gpg --import keyname_pub.asc
gpg --allow-secret-key-import --import keyname_sec.asc

Export keys:

gpg --output keyname_pub.asc --armor --export keyid
gpg --output keyname_sec.asc --armor --export-secret-key keyid

Delete keys:

gpg --delete-secret-keys XXKEYIDXX
gpg --delete-keys XXKEYIDXX

Flush password cache:

echo RELOADAGENT | gpg-connect-agent

Switch to hex mode: :%!xxd
Switch back from hex mode: :%!xxd -r

https://www.freedesktop.org/wiki/Software/fprint

Here's a quick/easy self-signed SSL cert creation command:

openssl req -new -x509 -keyout lighttpd.pem -out lighttpd.pem -days 365 -nodes

Alternately, for a separate key & cert file:

openssl req -newkey rsa:2048 -nodes -keyout yourapp.key -x509 -days 365 -out yourapp.pem

• yum install mod_ssl
• On CentOS, edit /etc/httpd/conf.d/ssl.conf and:
  • Comment out the SSL key file entry
  • Ensure correct name of SSL cert file
• Remove password from PEM cert:

  openssl rsa -in mycert.pem -out newcert.pem
  openssl x509 -in mycert.pem >> newcert.pem

• On CentOS, put password-less PEM/OpenSSL cert file at /etc/pki/ssl/certs/localhost.pem
• If you need to re-create the key from the PEM:

  openssl rsa -in mycert.pem -out mycert.key

• Restart apache

These points are mostly relevant to a slackware install, as that's what I use. I also prefer to operate the software out of its own home directory (especially since it has its own uid/gid).

• Create the lighttpd user and group:
  groupadd -g 208 lighttpd
useradd -u 208 -g 208 -d /home/lighttpd -s /bin/ksh -c “lighttpd” -m lighttpd
• Perform the slackbuild, and install the resulting package (or use a package you previously created with the slackbuild)
• Initialize the lighttpd login's home directory (easiest if logged in as the lighttpd user):
  cd
echo “export ENV=${HOME}/.kshrc” > .profile
echo “set nobackup” > .vimrc
mkdir bin etc www log tmp
chmod 750 bin etc www log tmp
• Acquire a suitable .kshrc for per-session environment config ( here's a sample .kshrc file )
• Apply the changes to configuration files indicated by the below diffs
• The changes to config files imply some further modifications to the stock installation footprint:
  • Move /etc/lighttpd/lighttpd.conf to ~lighttpd/etc
  • Replace the /etc/lighttpd directory with a link to ~lighttpd/etc
  • Replace the /var/log/lighttpd directory with a link to ~lighttpd/log
  • Remove the /var/www/htdocs-lighttpd directory

The below config file diffs assume using FastCGI, and contain a reference/inclusion to a FastCGI config file - here's a
sample FastCGI config file

diff -Naur old/rc.lighttpd new/rc.lighttpd
--- old/rc.lighttpd     2015-03-27 23:28:30.509740421 -0500
+++ new/rc.lighttpd     2015-03-27 23:29:52.655763520 -0500
@@ -21,8 +21,8 @@
 #
 
 LIGHTTPD=/usr/sbin/lighttpd
-PIDFILE=/var/run/lighttpd/lighttpd.pid
-LIGHTTPD_OPTIONS="-f /etc/lighttpd/lighttpd.conf"
+PIDFILE=/home/lighttpd/tmp/lighttpd.pid
+LIGHTTPD_OPTIONS="-f /home/lighttpd/etc/lighttpd.conf"
 
 is_pidof() {
   local STATE=$(ps -p $1 -o cmd= | grep "$2" > /dev/null ; echo $?)

diff -Naur old/lighttpd.conf new/lighttpd.conf
--- old/lighttpd.conf   2015-03-27 23:24:28.970432691 -0500
+++ new/lighttpd.conf   2015-03-27 23:24:42.677769203 -0500
@@ -25,7 +25,7 @@
 #                               "mod_proxy",
 #                               "mod_simple_vhost",
 #                               "mod_evhost",
-#                               "mod_userdir",
+                                "mod_userdir",
 #                               "mod_cgi",
 #                               "mod_compress",
 #                               "mod_ssi",
@@ -37,10 +37,13 @@
 
 ## a static document-root, for virtual-hosting take look at the
 ## server.virtual-* options
-server.document-root        = "/var/www/htdocs-lighttpd"
+server.document-root        = "/home/lighttpd/www"
+
+## User document root
+userdir.path                = "www"
 
 ## where to send error-messages to
-server.errorlog             = "/var/log/lighttpd/error.log"
+server.errorlog             = "/home/lighttpd/log/error.log"
 
 # files to check for if .../ is requested
 index-file.names            = ( "index.php", "index.html",
@@ -113,7 +116,7 @@
 # server.tag                 = "lighttpd"
 
 #### accesslog module
-accesslog.filename          = "/var/log/lighttpd/access.log"
+accesslog.filename          = "/home/lighttpd/log/access.log"
 
 ## deny access the file-extensions
 #
@@ -145,7 +148,7 @@
 #server.error-handler-404   = "/error-handler.php"
 
 ## to help the rc.scripts
-server.pid-file            = "/var/run/lighttpd/lighttpd.pid"
+server.pid-file            = "/home/lighttpd/tmp/lighttpd.pid"
 
 
 ###### virtual hosts
@@ -170,6 +173,9 @@
 
 ## virtual directory listings
 #dir-listing.activate       = "enable"
+$HTTP["url"] =~ "^/pub($|/)" {
+   dir-listing.activate = "enable"
+}
 
 ## enable debugging
 #debug.log-request-header   = "enable"
@@ -188,6 +194,9 @@
 ## change uid to <uid> (default: don't care)
 server.groupname           = "lighttpd"
 
+# Follow symbolic links at the filesystem level
+server.follow-symlink      = "enable"
+
 #### compress module
 #compress.cache-dir         = "/tmp/lighttpd/cache/compress/"
 #compress.filetype          = ("text/plain", "text/html")

If vhosts are desired, then a file named like lighttpd-hostname.conf would be created in ~lighttpd/etc that would look similar to this:

$HTTP["host"] =~ "yourdomain\.org" {
        server.document-root = "/home/lighttpd/yourdomainwwwroot"
        accesslog.filename   = "/home/lighttpd/log/yourdomain-access.log"
        errorlog.filename    = "/home/lighttpd/log/yourdomain-error.log"
}

… and then you would want to include that config file from the primary config file (~lighttpd/etc/lighttpd.conf)
include “lighttpd-hostname.conf”

This re-write config should be populated into the vhost config:

url.rewrite-once = (
"^/(wp-.+).*/?" => "$0",
"^/(sitemap.xml)" => "$0",
"^/(xmlrpc.php)" => "$0",
"^/keyword/([A-Za-z_0-9\-]+)/?$" => "/index.php?keyword=$1",
"^/.*?(\?.*)?$" => "/index.php$1"
)

Add something like this into a /etc/rsyslog.d/myprogram.conf file:

# Separate myprogram logging into its own file
if $programname == 'myprogram' then /var/log/myprogram.log
& stop

… then, something like logger -t myprogram “this is a log message” will get routed to the custom log file.
PHP code to do the same:

   openlog( "myprogram", 0, LOG_LOCAL6);
   syslog( LOG_NOTICE, "this is a log message");

Also, don't forget to add the custom log to logrotate by populating a file like /etc/logrotate.d/myprogram with:

/var/log/myprogram.log {
   missingok
   weekly
   size 2G
   copytruncate
   rotate 12
   notifempty
}

• Hydrogen is only available in 32-bit, so the 32-bit versions of Ardour and Jack should also be selected
• The libjack.dll in the Hydrogen program folder should be renamed so that it won't get used
  (Jack needs to use its own version of this DLL)

sudo apt-get install libx11-6:i386 libxext6:i386 libasound2:i386 libc6:i386 libfreetype6:i386 libc6:i386 libstdc++6:i386 libgcc1:i386 libxcb1:i386 zlib1g:i386 libpng12-0:i386 libxau6:i386 libxdmcp6:i386 libgl1-mesa-glx:i386 libgl1-mesa-dri:i386

In Unbuntu, add this PPA in order to use this bug-fixed and upgraded version:
https://launchpad.net/~sunab/+archive/ubuntu/kdenlive-release

In theme/default/help_index.php, a check for file existence will prevent significant log content created by bots/spammers trying to hit help pages that don't exist.
Line 40:

$str = file_get_contents($file);

Replace with:

$str = file_exists( $file) ? file_get_contents($file) : "";

 <item oor:path="/org.openoffice.Office.Labels/Manufacturer">
  <node oor:name="Avery Letter Size" oor:op="replace">
   <node oor:name="Label0" oor:op="replace">
    <prop oor:name="Measure" oor:op="fuse">
     <value>S;5334;1676;4445;1651;1016;1473;4;15;21590;27940</value>
    </prop>
    <prop oor:name="Name" oor:op="fuse"><value>5195 Return Address Labels</value></prop>
   </node>
  </node>
 </item>

A useful reference: RFC 1912
In particular, MX DNS records should not refer to CNAME records, only A records

In order to forward mail using a .forward file, and when your home directory has to be group-writable, this sendmail option has to be specified in the configuration:

O DontBlameSendmail=forwardfileingroupwritabledirpath

… or, in the MC file …

define(`confDONT_BLAME_SENDMAIL',``forwardfileingroupwritabledirpath,otherdontblames,...'')

An rsync daemon for public rsync service can be set up with these files. /etc/rsyncd.conf

max connections = 2
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsyncd.lck
timeout = 300

[fxp]
	comment = Public FreeSlack mirror
	path = /srv/www/zenteknix.com/fxp
	read only = yes
	list = yes
	uid = nobody
	gid = lighttpd
	auth users = anonymous
	secrets file = /etc/rsyncd.secrets

/etc/rc.d/rc.rsyncd

#!/bin/sh
# Start/stop/restart rsync daemon.
 
# Start rsync daemon:
rsyncd_start() {
  CMDLINE="/usr/bin/rsync --daemon --config=/etc/rsyncd.conf --bwlimit=512"
  echo -n "Starting NTP daemon:  $CMDLINE"
  $CMDLINE
  echo
}
 
# Stop rsync daemon:
rsyncd_stop() {
  echo -n "Stopping rsync daemon..."
  if [ -r /var/run/rsyncd.pid ]; then
    kill -HUP $(cat /var/run/rsyncd.pid)
    rm -f /var/run/rsyncd.pid
# else
#   killall -HUP -q rsync
  fi
  echo
}
 
# Restart rsync daemon:
rsyncd_restart() {
  rsyncd_stop
  sleep 1
  rsyncd_start
}
 
# Check if rsync daemon is running
rsyncd_status() {
  if [ -e /var/run/rsyncd.pid ]; then
    echo "rsync daemon is running."
  else 
    echo "rsync daemon is stopped."
    exit 1
  fi
}
 
case "$1" in
'start')
  rsyncd_start
  ;;
'stop')
  rsyncd_stop
  ;;
'restart')
  rsyncd_restart
  ;;
'status')
  rsyncd_status
  ;;
*)
  echo "usage $0 start|stop|restart|status"
esac

First, add a profile by launching firefox like: firefox –new-instance -P profilename
… and add a profile to suit the app you want to run in the minimal window.
Open firefox using the profile, and go to about:config in the URL bar.
Change the value of toolkit.legacyUserProfileCustomizations.stylesheets to true.
Then, populate file $HOME/.mozilla/firefox/<profileid>.<profilename>/chrome/userChrome.css with:

/*
 * Do not remove the @namespace line -- required to work
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

/*
 * Hide tab bar, navigation bar and scrollbars
 * !important may be added to force override, but not necessary
 */
#TabsToolbar {visibility: collapse; !important; }
#navigator-toolbox {visibility: collapse; !important; }
#content browser {margin-right: -14px; margin-bottom: -14px;}

In .vimrc:

set noundofile

This is how to put a file using WebDAV (tested with webdav on lighttpd)

curl -H "Expect:" -T file.txt --user login:password http://www.website.com/dav/pub/