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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘*nix-tools’ Category

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installing the joe terminal/console text editor on Mac OS X: brew to the rescue

Posted by jpluimers on 2016/10/07

The most recent versions of Joe don’t even build from stock in OS X any more and there are no direct installers for them.

But there are two most recent older versions that have installers, and a formula recent brew based HomeBrew installation:

  1. joe-3.7-0.pkg – rudix-snowleopard – JOE – Rudix: The hassle-free way to get Unix programs on Mac OS X – Google Project Hosting.
  2. PROJECT DETAIL for Joe’s Own Editor.
  3. Homebrew Formulas – Joe.

After experimenting for a while without brew preferring the first over second, I’ve installed the the third as:

  1. The first actually installs version 3.6, but has the syntax highlighting files installed in the correct place, so you get syntax highlighting.
  2. The second does install version 3.7, but since the syntax highlighting files are in the wrong place: you get no syntax highlighting.
  3. The brew formula has an up to date joe version 4.0 and installs the syntax highlighting in the right place: you get syntax highlighting.

Before making a choice, you might want to consider reading about joe versions in JOE – Joe’s own editor / … /NEWS.md.

Having a background partially in the Linux world, I tried building joe from source on my Mac following the steps at JOE – Joe’s own editor / Discussion / joe-editor-general:Mac binary for 3.3 does not run on OS/X 10.8. It failed because the Mercurial 3.8 branch required automake and autoconf which are not available on  just a Mac + Xcode. So I’m happy that others have bit the bullet and make a good HomeBrew build.

What makes HomeBrew so great is that it is based on a fully versioned git/ruby combination, allows for multiple Python versions, allows for binaries through bintray served bottles and has zillions (well, thousands) of installable formulae, all versioned.

–jeroen

Posted in *nix, *nix-tools, Apple, joe, Mac OS X / OS X / MacOS, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, OS X 10.10 Yosemite, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User | Leave a Comment »

Awesome vim cheat sheet for your consideration. Download #vimcheatsheet

Posted by jpluimers on 2016/09/26

Awesome vim cheat sheet for your consideration. Download http://vimcheatsheet.com

You can either

  1. buy the poster (which is now at version 2.0),
  2. buy the digital PDF downloads (at version 2.0 too),
  3. get the free small resolution PNG downloads at 1024 x 700 or 1979 x 1346.

–jeroen

via:

Read the rest of this entry »

Posted in *nix, *nix-tools, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

Converting sendmail .db files to text

Posted by jpluimers on 2016/09/15

If you want to inverse the work of newaliases, you can use makemap to convert them to text:

makemap -u hash access.db

This is quite handy to see if the newaliases indeed put all information into the db file (for instance if you use a script, you can verify it ran correctly).

It works for any db, but you need to be aware of the database format: hash type or btree type.

To my knowledge only one uses the btree type format:

  • userdb.db

All others use hash type format:

  • aliases.db
  • aliases-maillist.db
  • mailertable.db
  • genericstable.db
  • virtusertable.db
  • access.db
  • auth-info.db
  • domaintable.db

–jeroen

via: Reading Sendmail .db files.

Posted in *nix, *nix-tools, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »

ESXi: when esxtop shows garbage.

Posted by jpluimers on 2016/09/14

The ESXi console top to show processes is not available *, the alternative is esxtop. But that can show garbage because the ESXi console has a very limited support of terminals **.

For instance, when connecting from a Mac OS X terminal through ssh, this is my terminal:

# echo $TERM
xterm-256color

The solution:

TERM=xterm esxtop

–jeroen

via: VMware KB: Output of esxtop defaults to non-interactive CSV with unknown TermInfo.

Read the rest of this entry »

Posted in *nix, *nix-tools, bash, bash, Development, ESXi5, ESXi5.1, ESXi5.5, ESXi6, Power User, Scripting, Virtualization, VMware, VMware ESXi | 2 Comments »

Flush deferred messages in sendmail queue :: Stephan Paukner :: syslog

Posted by jpluimers on 2016/09/12

Be careful with setting the timeout of sendmail to zero when trying to flush the mail queue:

sendmail -OTimeout.hoststatus=0m -q -v

Reason: a lot of target systems do rate-limiting if you retry too much in too short time, for instance gmail does that:

421-4.7.0 [###.###.###.### 15] Our system has detected an unusual rate of
421-4.7.0 unsolicited mail originating from your IP address. To protect our
421-4.7.0 users from spam, mail sent from your IP address has been temporarily
421-4.7.0 rate limited. Please visit
421-4.7.0 https://support.google.com/mail/answer/81126 to review our Bulk Email
421 4.7.0 Senders Guidelines. w1si28749381wju.16 - gsmtp

–jeroen

via Flush deferred messages in sendmail queue :: Stephan Paukner :: syslog.

Posted in *nix, *nix-tools, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

A bash script to btrfs snapshot details like disk sizes (requires btrfs quota to be enabled)

Posted by jpluimers on 2016/09/06

One thing I’ve not figured out yet is this: How does enabling btrfs quotas impact the system? – Unix & Linux Stack Exchange

My gut feeling says it’s not much. But if someone knows: please chime in.

Anyway: btrfs quota support helps you to see how big snapshots (and other subvolumes) are.

Enabling and disabling is easy (the slash is the path from where to enable quota):

btrfs quota enable /

btrfs quota disable /

The bad thing is that there is no command that gives just the quota status. You have to revert to btrfs qgroup show /

This will show you quota groups when quota are enabled:

qgroupid         rfer         excl 
--------         ----         ---- 
0/5          16.00KiB     16.00KiB

or errors when quota are disabled either of these two errors:

# btrfs qgroup show /
ERROR: can't perform the search - No such file or directory
ERROR: can't list qgroups: No such file or directory

# btrfs qgroup show /
ERROR: can't list qgroups: quotas not enabled

You might also want to check the syslogs as there was a [PATCH 1/2] btrfs: syslog when quota is enabled.

The btrfs qgroup output is the base for agronick/btrfs-size: A script that will print out a list of BTRFS subvolumes along with their size in megabytes and their name.

It actually shows it in human readable form (kilo/mega/giga/… bytes) and is documented at Get the size of your BTRFS Snapshots | PoisonPacket. It gives me a nice overview that corresponds to the snapper list output (see below).

The script has two drawbacks:

./btrfs-size/btrfs-size.sh: line 55: can't + 0: syntax error: invalid arithmetic operator (error token is "'t + 0")

  • it can take a while for btrfs quota enable / to actually deliver the quota for all the qgroupid values snapper uses. Until that time, the columns ID/Total/Exclusive Data are empty.
  • it won’t warn you if the quota data is out of data; to check that, run the below script

# btrfs qgroup show / > /dev/null
WARNING: Qgroup data inconsistent, rescan recommended

In that case, run btrfs quota rescan / and wait for it to complete by running this command until the warning is gone:

# btrfs qgroup show / > /dev/null
WARNING: Rescan is running, qgroup data may be incorrect

If the warning reverts to WARNING: Qgroup data inconsistent, rescan recommended then you might see the effects from this bug and should not worry about it: Bug 933428 – btrfs qgroup – allways shows WARNING: Qgroup data inconsistent.

For more btrfs quota background information, see: UseCases – btrfs Wiki.

–jeroen

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Posted in *nix, *nix-tools, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux, Tumbleweed | 1 Comment »

tombh/texttop: A fully interactive X Linux desktop rendered in TTY and streamable over SSH

Posted by jpluimers on 2016/08/09

Wonder if I can get this to work from macOS / OS X as a client:

texttop – A fully interactive X Linux desktop rendered in TTY and streamable over SSH

Source: tombh/texttop: A fully interactive X Linux desktop rendered in TTY and streamable over SSH

via: Kristian Köhntopp – Google+

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Posted in *nix, *nix-tools, Communications Development, Development, Internet protocol suite, Linux, Power User, Software Development, SSH, TCP | Leave a Comment »

bash – How can I convert tabs to spaces in every file of a directory? – Stack Overflow

Posted by jpluimers on 2016/08/05

Kev:

Try the command line tool expand.

expand -t 4 input >output

Chrono Kitsune:

And for those systems that don’t use the GNU Core Utilities, you have a decent chance of expand being installed since it is standardized by The Open Group’s Single Unix Specification. See Issue 6, which is from 2001, though some updates were applied, hence the year of publication being 2004: expand

–jeroen

via bash – How can I convert tabs to spaces in every file of a directory? – Stack Overflow.

Posted in *nix, *nix-tools, bash, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »

moreutils: sponge

Posted by jpluimers on 2016/07/29

sponge, a great *nix tool part of moreutils:

sponge: soak up standard input and write to a file

Now need to figure out how to get it on Tumbleweed; maybe http://rpm.pbone.net/index.php3/stat/4/idpl/23781842/dir/opensuse/com/moreutils-0.48-1.1.i586.rpm.html

–jeroen

via: moreutils.

Posted in *nix, *nix-tools, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

Woof – simply exchange files – one-time sharing of a file over http

Posted by jpluimers on 2016/06/22

Woof is a small simple stupid webserver that can easily be invoked on a single file. Your partner can access the file with tools he trusts (e.g. wget). No need to enter passwords on keyboards where you don’t know about keyboard sniffers, no need to start a huge lot of infrastructure, just do a

$ woof filenameand

tell the recipient the URL woof spits out. When he got that file, woof will quit and everything is done.And when someone wants to send you a file, woof has a switch to offer itself, so he can get woof and offer a file to you. …

Woof needs Python on a unix’ish operating system. Some people have used it successfully on Windows within the cygwin environment.

Source: Woof – simply exchange files

Works from homebrew on OS X.

via: Web Offer One File – Thomas Mueller (dummzeuch) – Google+

Source: Web Offer One File

–jeroen

Posted in *nix, *nix-tools, Apple, BSD, Home brew / homebrew, Linux, Mac, Mac OS X / OS X / MacOS, Power User | Leave a Comment »

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