As of 20170711, the servername ftp.xs4all.nl does not support the ftp protocol any more; xs4all clients can only use the server sftp.xs4all.nl on port 22.
I missed that because I hardly use ftp except for the few rare occasions where I was in an environment without ftp.
So recently I found out: good move!
Since I still need this every now and then (but far less often than 10 years ago), I have set up a very small ftp server at home with limited storage and very limited users that I can turn on/off when needed.
If you ever ssh into something and immediately get the immediate Too many authentication failures message, then you’ve probably mixed your authentication methods.
Video via +Kristian Köhntopp “Die 90er haben angerufen und wollen ihre Amiga Videos und ihre Corba Specs zurück haben.” (the 90s called wanting their Amiga Videos and Corba Specs back)
/ ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$ / g
Explanation:
^ asserts position at start of the string
1st Capturing Group (([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}
{3} Quantifier — Matches exactly 3 times
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you’re not interested in the data
2nd Capturing Group ([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])
1st Alternative [0-9]
Match a single character present in the list below [0-9] 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
2nd Alternative [1-9][0-9]
Match a single character present in the list below [1-9] 1-9 a single character in the range between 1 (ASCII 49) and 9 (ASCII 57) (case sensitive)
Match a single character present in the list below [0-9] 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
3rd Alternative 1[0-9]{2}
1 matches the character 1 literally (case sensitive)
Match a single character present in the list below [0-9]{2} {2} Quantifier — Matches exactly 2 times 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
4th Alternative 2[0-4][0-9]
2 matches the character 2 literally (case sensitive)
Match a single character present in the list below [0-4] 0-4 a single character in the range between 0 (ASCII 48) and 4 (ASCII 52) (case sensitive)
Match a single character present in the list below [0-9] 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
5th Alternative 25[0-5]
25 matches the characters 25 literally (case sensitive)
Match a single character present in the list below [0-5] 0-5 a single character in the range between 0 (ASCII 48) and 5 (ASCII 53) (case sensitive)
\. matches the character . literally (case sensitive)
3rd Capturing Group ([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])
1st Alternative [0-9]
Match a single character present in the list below [0-9]
0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
2nd Alternative [1-9][0-9]
Match a single character present in the list below [1-9] 1-9 a single character in the range between 1 (ASCII 49) and 9 (ASCII 57) (case sensitive)
Match a single character present in the list below [0-9] 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
3rd Alternative 1[0-9]{2}
1 matches the character 1 literally (case sensitive)
Match a single character present in the list below [0-9]{2} {2} Quantifier — Matches exactly 2 times 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
4th Alternative 2[0-4][0-9]
2 matches the character 2 literally (case sensitive)
Match a single character present in the list below [0-4] 0-4 a single character in the range between 0 (ASCII 48) and 4 (ASCII 52) (case sensitive)
Match a single character present in the list below [0-9] 0-9 a single character in the range between 0 (ASCII 48) and 9 (ASCII 57) (case sensitive)
5th Alternative 25[0-5]
25 matches the characters 25 literally (case sensitive)
Match a single character present in the list below [0-5] 0-5 a single character in the range between 0 (ASCII 48) and 5 (ASCII 53) (case sensitive)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Global pattern flags g modifier: global. All matches (don’t return after first match)
HTTP Prompt is an interactive command-line HTTP client featuring autocomplete and syntax highlighting. Download url -> https://github.com/eliangcs/http-prompt – Joe C. Hecht – Google+
I’ve been using cURL but always had a feeling not to its potential basically because the cURL man page [WayBack] is both massive and lacks concrete useful practical examples.
For instance, I knew about the --header and --verbose options (I always use verbose names even though shorter -H and -v exist) to pass a specific header and get verbose output, but the man page basic examples like this by Tader:
You know the drill: site that limits incoming traffic and has painful VPN. Luckily this time outgoing ssh traffic on port 22 was allowed (because they do SFTP which is SSH File Transfer).
That didn’t work: a remote machine could not RDP to port 3389, but a local telnet localhost 3389 would. The reason is that by default sshd binds a remote port to the local address only and not the wildcard addres.
So you have to open up the remote config a bit: at least /etc/sshd_config and most likely also your firewall.
The Wiert Corner - irregular stream of stuff 