Posted by jpluimers on 2017/07/07
Good reading on #NoEmailDay 2017: The case of the 500-mile email [WayBack] on how a sysadmin in the mid 1990s found the cause of not being able to send email further than roughly 500 miles.
The exact mile unit doesn’t matter as it was all approximation. Read the FAQ on the 500-mile email [WayBack]
–jeroen
via:
PS: some sendmail tricks from
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Posted by jpluimers on 2017/07/03
fuser is a simple yet powerful command line utility intended to locate processes based on the files, directories or socket a particular process is accessing.
Source: Learn How to Use ‘fuser’ Command with Examples in Linux [WayBack]
via: Learn How to Use ‘fuser’ Command with Examples in #Linux – Joe C. Hecht – Google+ [WayBack]
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Posted by jpluimers on 2017/06/21
For one of my VMs I forgot to note which of the initial password I had changed, so I wanted to check them.
Since I didn’t have a keyboard attached to the console and ssh wasn’t allowing root, I needed an alternative than actual login to test the passwords.
Luckily /etc/shadow, with getent and openssl came to the rescue.
Since getent varies per distribution, here is how it works on OpenSuSE:
Posted in *nix, *nix-tools, ash/dash, bash, bash, Development, Encoding, Hashing, Linux, md5, openSuSE, Power User, Scripting, Security, SHA, SHA-256, SHA-512, Software Development, SuSE Linux | Leave a Comment »
Posted by jpluimers on 2017/05/24
Apparently, this is not just a joke, but a real problem:
This morning, a popular Stack Overflow question hit a major milestone:
There is an in depth analysis at [WayBack] Stack Overflow: Helping One Million Developers Exit Vim – Stack Overflow Blog
Via: [WayBack] Fabian S. Biehn – Google+
–jeroen
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Posted by jpluimers on 2017/05/24
Cool: someone made a CheatSheet for Readline keyboard shortcuts for bash, bc, ftp, gnuplot, gpg, ksh, mysql, psql, python, smbclient, xmllint and zsh [WayBack] of the GNU Readline library [WayBack].
–jeroen
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Posted by jpluimers on 2017/05/22
I’ve mounted nearly everything with noatime, doesn’t make sense most of the time to have atime updated.
Source: “BTRFS and find considered harmful?” Thats the headline a colleaqe suggested -…
–jeroen
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Posted by jpluimers on 2017/05/15
Never noticed there were sources available for the official Linux no-ip client, but there are: northfield_systems/noip2.c at master · sweetonmac/northfield_systems
Looks similar to what these do: Dynamic DNS through NO-IP: keeping your hosts current, and your NO-IP account happy. « The Wiert Corner – irregular stream of stuff
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Posted by jpluimers on 2017/05/08
From ext3 – How to tell the language encoding of a filename on Linux? – Server Fault [WayBack] I learned a few things:
A good default is UTF-8, but it’s never guaranteed.
Two tools can help to determine the encoding of a filename:
–jeroen
Posted in *nix, *nix-tools, Development, Encoding, Power User, Software Development, UTF-8, UTF8 | Leave a Comment »
Posted by jpluimers on 2017/04/28
HowTo: Wget Command Examples – Wget is a free software package for retrieving files using HTTP, HTTPS and FTP, the most widely-used Internet protocols
Source: HowTo: Wget Command Examples [WayBack]
I totally forgot about
-c switch that continues an aborted download.-r -A combination to only download certain file types.–jeroen
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Posted by jpluimers on 2017/04/24
I don’t use Wireshark enough to be fluent, so here are some links and quotes that proved to be useful for me:
(ip.dst == 192.168.99.61 && ip.src == 192.168.99.38) || (ip.dst == 192.168.99.38 && ip.src == 192.168.99.61) && http(ip.addr == 192.168.99.61 && ip.src == 192.168.99.38) && httphttp contains "SOAPAction:" || http contains "HTTP"src 213.146.155.196 and tcp port 8500ether host MAC 00:21:AC:01:08:B1frame contains clause will match any binary content in the frame (you can be more specific with for instance tcp containsor data contains (which uses the data dissector). Example: (frame contains 21:00 || frame contains 00:21) && tcp.len > 0data.data matches "\xa4.\xc3...\xb2"eth.src == MAC 00:21:AC:01:08:B1GET as tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420POST as tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354 && tcp[((tcp[12:1] & 0xf0) >> 2) + 4:1] = 0x20–jeroen
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The Wiert Corner - irregular stream of stuff 