For my link archive because of the tips: [WayBack] How To Use Journalctl to View and Manipulate Systemd Logs | DigitalOcean
–jeroen
Archive for the ‘*nix-tools’ Category
How To Use Journalctl to View and Manipulate Systemd Logs | DigitalOcean
Posted by jpluimers on 2020/11/05
Posted in *nix, *nix-tools, journalctl and journald, Linux, Power User | Leave a Comment »
Rebooting a Linux server unattended – twm’s blog
Posted by jpluimers on 2020/09/21
[WayBack] Rebooting a Linux server unattended – twm’s blog:
/sbin/shutdown -r now
Simple, but I keep forgetting where Linux has short/long command options and short/long verbs.
–jeroen
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Posted in *nix, *nix-tools, Debian, Linux, OpenShift, openSuSE, Power User, Raspbian, RedHat, SuSE Linux, Tumbleweed, Ubuntu | Leave a Comment »
I need to dig into IPP / driverless printer confuguration
Posted by jpluimers on 2020/09/07
It looks like I need to learn about IPP and driverless based on [WayBack] TIL that your Linux desktop can probably use your somewhat recently made printer, efficiently, with all major features exposed, without needing to download a ton of vendor shitware, without needing to find a PPD file in the depths of hell, without needing to pay extra for explicit PostScript 3 support, and without needing to accept that it will do 0.2 instead of 20 pages per minute because the in-printer PostScript rasterizer runs on a Z80…. – Maik Zumstrull – Google+.
So here are some links:
- [WayBack] driverless(1) — cups-filters-core-drivers — Debian testing — Debian Manpages: driverless generates PPD files for printers which are designed for driverless printing (currently IPP Everywhere and AirPrint printers) by polling capability information from the printers via IPP. it can be either called for listing suitable printers in the network and for actually generating the PPD. It can also be called by CUPS when CUPS is listing available PPDs/drivers or creating print queues, making the setup of driverless printers with printer setup tools transparently working.
- Internet Printing Protocol – Wikipedia
- [Archive.is] IPP / CUPS printing for Chrome & Chromebooks – Chrome Web Store
Via: [WayBack] TIL that your Linux desktop can probably use your somewhat recently made prin… – Kristian Köhntopp – G+
When adding my printer in the Chrome tool, it can properly detect it:
OKI MC342
http://192.168.71.52:631Printer informationPrinter make/model: OKI-MC342-36855D
Printer state: idle
Accepting jobs: true
IPP server version: 1.1
Supports PDF natively: true
Supports PWG raster: false
Supports Postscript: true
Supports Unirast: true
Supports application/octet-stream: true
CUPS server: No
Compatability report: PASS Printer should be compatible – try printing
–jeroen
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Posted in *nix, *nix-tools, Hardware, OKI C332, OKI Printers, Power User, Printers | 2 Comments »
bash – convert comma separated values into a list of values using shell script – Stack Overflow
Posted by jpluimers on 2020/09/07
For a simple comma separated list (no quotes), I was expecting a sed script (and indeed it is possible), but tr is more elegant:
Use
trto change , into newlines:
tr , "\n" < list.txt
Source: [WayBack] bash – convert comma separated values into a list of values using shell script – Stack Overflow.
–jeroen
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Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »
find – display only files starting with . (hidden) – Unix & Linux Stack Exchange
Posted by jpluimers on 2020/08/21
find . -type f -name '\.*' -printMust work if you want list every hidden file down in the directory hierarchy.
This sort of works on Linux, but fails on VMware ESXi (on Linux it only works when applying -maxdepth 1, deeper levels fails because they list all files where the top directory starts with a .):
If you want hidden files and hidden directories, without . and .. :find -regex '\./\..+' -print
This works on both Linux and VMware ESXi:
If you want hidden files and hidden directories, without . and .. :
find . \( -type f -o -type d \) -name '\.*' -print
Based on:
- [WayBack] find – display only files starting with . (hidden) – Unix & Linux Stack Exchange
- [WayBack] shell – `find -name` pattern that matches multiple patterns – Stack Overflow
–jeroen
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Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »
Dirvish
Posted by jpluimers on 2020/08/17
I think it was Thomas Mueller pointing to this, but I’m not sure as I found it in a browser tab from long ago: [WayBack] Welcome to Dirvish
Dirvish is a fast, disk based, rotating network backup system.
With dirvish you can maintain a set of complete images of your filesystems with unattended creation and expiration. A dirvish backup vault is like a time machine for your data.
Dirvish was originally created by jw schultz .
Before starting, I want to read these:
- [WayBack] DirvishWiki – Dirvish wiki
- [WayBack] Dirvish Documentation
- [WayBack] DirvishTips – Dirvish wiki
–jeroen
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Posted in *nix, *nix-tools, Power User, rsync | Leave a Comment »
Comparing versions with wildcards and without them (for instance for semantic versioning)
Posted by jpluimers on 2020/08/12
For a project I’m going to be in need to compare version numbers.
I’m not sure yet if I need wildcards, or can leave them out (but for partial semantic versioning, I might need them).
Below a bunch of links that should get me started.
From a quick glance: versioning is hard, comparing even harder.
On versioning in general
- [WayBack] Why are version constraints combining comparisons and wildcards a bad idea? – Composer
- [WayBack] Compare Version Numbers with large inputs allowed – GeeksforGeeks
- [WayBack] Compare two Version numbers – GeeksforGeeks
- [WayBack] Re: RPM version comparison algorithm
- [WayBack] How Yum and RPM Compare Versions – Jason Antman’s Blog
Numeric versioning (usually without wildcards):
- [WayBack] algorithm – Javascript function to compare two versions – Stack Overflow
- [WayBack] java – Comparing version number strings (major, minor, revision, beta) – Stack Overflow
- [WayBack] versioning – Comparing two software versions in C# – Software Engineering Stack Exchange
- [WayBack] Comparing Version Strings in C++ | Sourcey
On semantic versioning (SemVer for short):
- [WayBack] Semantic Versioning 2.0.0 | Semantic Versioning
- [WayBack] GitHub – scottcorgan/compare-semver: Compare semver versions to many other semver versions
- [WayBack] Simple Versioning · GitHub: A simple, pragmatic versioning convention.In a sense, this is a subset of SemVer, but with slightly different semantics.
- [WayBack] Why Semantic Versioning Isn’t · GitHub – an essay – followed by a lively discussion – against SemVer which turns out to actually end in favour of SemVer
- [WayBack] Just published my smallest ever open source project – 1 unit (not counting the unit tests) … – Vincent Parrett – Google+
- [WayBack] GitHub – VSoftTechnologies/SemanticVersion: Semantic Version Parser for Delphi
- Nice discussion on
inversusCharInSetversusIsDigitversusIsInArray
- [WayBack] Semantic Version C# class · GitHub
- [WayBack] c# – Is there a NuGet package that contains a semantic version parser in .NET? – Stack Overflow
- [WayBack] Semantic Version Functions | sprig Useful template functions for Go templates.
- [WayBack] GitHub – zafarkhaja/jsemver: Java implementation of the SemVer Specification
- [WayBack] Semantic version utility · Issue #566 · stedolan/jq · GitHub
- [WayBack] semver: Basics
- [WayBack] GitHub – substack/semver-compare: compare two semver version strings, returning -1, 0, or 1
On the C# Version class (which handles most of semantic versioning except: leading zero’s, very large numbers, non-numeric release specifiers)
- [WayBack] validation – C# Compare two versions using wildcard – Stack Overflow
- [WayBack] c# – Compare version numbers without using split function – Stack Overflow
- [WayBack] Version.CompareTo Method (Object) (System) which does not regard undefined (-1) as wildcards by documenting
// A Version object contains four hierarchical numeric components: major, minor, // build and revision. Build and revision may be unspecified, which is represented // internally as a -1. By definition, an unspecified component matches anything // (both unspecified and specified), and an unspecified component is "less than" any // specified component.
- [WayBack] Version Class (System) The value of Version properties that have not been explicitly assigned a value is undefined (-1); Ordinarily, the Version class is not used to assign a version number to an assembly. Instead, the AssemblyVersionAttribute class is used to define an assembly’s version, as illustrated by the example in this topic.
Interesting idea, but not sustainable: using floating point values to compare versions:
On wildcards:
- 2008 [Archive.is] Matching Wildcards: An Algorithm | Dr Dobb’s: A simple wildcard text-matching algorithm in a single while loop
- 2014 [ Archive.is] Matching Wildcards: An Empirical Way to Tame an Algorithm | Dr Dobb’s: Optimizing and testing a wildcard algorithm to get 5x performance improvement.
Via: [WayBack] Anyone tips for a TVersion structure that supports at max quad digits or wildcards and comparison? Like 3.2 matching 3.2.5.7, but not matching 3.3.4.28 ? – Jeroen Wiert Pluimers – Google+
–jeroen
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Posted in *nix, *nix-tools, Development, Power User, rpm, Software Development, Versioning | Leave a Comment »
Remote access to the Embarcadero License Center via SSH tunnel – twm’s blog
Posted by jpluimers on 2020/08/10
Thomas basically did all the research on the forwarding needed for ELC (formerly Belise/Elise), then showed the PuTTY equivalent to ssh user@remote -L5567:192.168.1.200:5567:
[WayBack] Remote access to the Embarcadero License Center via SSH tunnel – twm’s blog
Via: [WayBack] Once you have set up an Embarcadero License Center (ELC) for your company (with network named user or concurrent licenses) you will need network access … – Thomas Mueller (dummzeuch) – Google+
Related: [WayBack] Introducing the Embarcadero License Center – ELC
–jeroen
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Posted in *nix, Communications Development, Delphi, Development, Internet protocol suite, Licensing, Power User, Software Development, SSH, ssh/sshd | Leave a Comment »
If your Samba logon script does not get executed – twm’s blog
Posted by jpluimers on 2020/07/31
… even though you can open and read it fine in an editor: You should check its Linux access permissions. If it is not marked as executable, this might be the cause. Change it with chmod like …
Source for my link archive: [WayBack] If your Samba logon script does not get executed – twm’s blog.
Via: [WayBack] … even though you can open and read it fine in an editor: You should check its Linux access permissions. If it is not marked as executable, this might b… – Thomas Mueller (dummzeuch) – Google+
–jeroen
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Verifying large sets of file hashes with md5sum
Posted by jpluimers on 2020/07/24
A few tips:
- Recursively getting all md5 sums from a source directory:
cd /sourceDirectory
find -type f \( -not -name "md5sum.txt" \) -exec md5sum '{}' \; > md5sum.txt.
- Checking the sums against a target directory
cd /targetDirectory
md5sum -c /sourceDirectory/md5sum.txt.
On some systems (this was an ESXi system which can’t run stuff from the console in parallel), you could optimise this using xargs for the generation and GNU parallel for the generation and checking. Both should be very similar:
GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel.
Via:
- [WayBack] command line – How can I recursively list Md5sum of all the files in a directory and its subdirectories? – Ask Ubuntu
- [WayBack] GNU Parallel – GNU Project – Free Software Foundation
- [WayBack] bash – parallel check md5 file – Stack Overflow
- [WayBack] Bash: parallelize md5sum checksum on many files – Stack Overflow
–jeroen
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The Wiert Corner - irregular stream of stuff 