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

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Archive for the ‘cURL’ Category

When high SEO ranking fails to give you a reliable result: failed to detect the WayBack Machine outage

Posted by jpluimers on 2022/02/11

A high SEO ranking does not automatically indicate a reliable result.

When the WayBack Machine was down a while ago (it responded to traceroute UDP requests, but would not establish TCP connections on ports 80 and 443), the first Google hit for detecting down status (searching for [] waybackmachine down – Google Search) failed miserably because it redirected (which fails) to (which succeeds):

IsIdDownRightNow failing to detect downtime

IsIdDownRightNow failing to detect downtime

Luckily when asking around on Twitter:

  • others were experiencing the same problem, not just in The Netherlands, but also in other countries
  • after trying a few things, the WayBack machine got backup [] before I could try cURL.
  • I got pointed at which correctly does check the right subdomain and shows it is down from many locations:

Read the rest of this entry »

Posted in *nix, cURL, Infrastructure, Internet, InternetArchive, LifeHacker, Power User, WayBack machine | Leave a Comment »

Downloading files with wget on ESXi · random writes

Posted by jpluimers on 2021/05/31

Reminder to self to check if wget on ESXi now finally supports https downloading: [WayBack] Downloading files with wget on ESXi · random writes.

In the mean time, ESXi 6.7 Update 2 and up seems to support this; so the below workaround might only be needed for ESXi 6.7 update 1 and below.

[WayBack] VMware ESXi: help downloading large ISO – Server Fault

I will likely not do this, as by now all my ESXi boxes should have been recent enough.

I will keep the article because of the BusyBox commands section below.

If so, I might finally try and write a Python wrapper for this, as I know that Python 3 on ESXi supports https, but the ESXi BusyBox does not have a built-in cURL.

Some links and notes I might need by then:

BusyBox commands

Another cool thing in the above blog post is that it shows how to dump the BusyBox built in commands.

I ran it for ESXi 6.7 with a slight trick to get the full path (using back-ticks and escaped back-ticks) and content.

Since ESXi is BusyBox based, the commands that are in /bin are not actually binaries, but each command is a symlink to the BusyBox binary. BusyBox then knows the original name of the command, so it can deduct what part to execute. This makes for a very space efficient storage scheme.

The various bits of the tricks to get the location of the BusyBox binary, so the --list parameter can be passed to it:

  • The which wget gives the full path of wget.
  • The ls -l `which wget` shows the full path of wget and the symlink target (but there is no way for ls to only show the symlink target).
  • The readlink -f `which wget` shows the full path of where /bin/wget points to: the BusyBox binary.

The main trick consists of backtick evalution, and knowing that ls cannot get you just the symlink target, but readlink can:

Now the back-tick escapes, because you cannot nest back-ticks:

  • The `readlink -f \`which wget\`` executes the BusyBox binary without arguments.
  • The `readlink -f \`which wget\`` --list executes the BusyBox binary with the --list parameter.

Note I do not like the cat --help (see [WayBack] How do I check busybox version (from busybox)? – Unix & Linux Stack Exchange) way of getting the BusyBox version, as that gets echoed to stderr.

This is the output:

Read the rest of this entry »

Posted in *nix, *nix-tools, cURL, ESXi6, ESXi6.5, ESXi6.7, Power User, Virtualization, VMware ESXi, wget | Leave a Comment »

56 Linux Networking commands and scripts

Posted by jpluimers on 2021/01/25

Back in 2019, there were 56 commands and scripts covered. I wonder how many there are now.

An ongoing list of Linux Networking Commands and Scripts. These commands and scripts can be used to configure or troubleshoot your Linux network.

Source: [WayBack55 Linux Networking commands and scripts

List back then (which goes beyond just built-in commands: many commands from optional packages are here as well):

  1. arpwatch – Ethernet Activity Monitor.
  2. bmon – bandwidth monitor and rate estimator.
  3. bwm-ng – live network bandwidth monitor.
  4. curl – transferring data with URLs. (or try httpie)
  5. darkstat – captures network traffic, usage statistics.
  6. dhclient – Dynamic Host Configuration Protocol Client
  7. dig – query DNS servers for information.
  8. dstat – replacement for vmstat, iostat, mpstat, netstat and ifstat.
  9. ethtool – utility for controlling network drivers and hardware.
  10. gated – gateway routing daemon.
  11. host – DNS lookup utility.
  12. hping – TCP/IP packet assembler/analyzer.
  13. ibmonitor – shows bandwidth and total data transferred.
  14. ifstat –  report network interfaces bandwidth.
  15. iftop – display bandwidth usage.
  16. ip (PDF file) – a command with more features that ifconfig (net-tools).
  17. iperf3 – network bandwidth measurement tool. (above screenshot Stacklinux VPS)
  18. iproute2 – collection of utilities for controlling TCP/IP.
  19. iptables – take control of network traffic.
  20. IPTraf – An IP Network Monitor.
  21. iputils – set of small useful utilities for Linux networking.
  22. jwhois (whois) – client for the whois service.
  23. “lsof -i” – reveal information about your network sockets.
  24. mtr – network diagnostic tool.
  25. net-tools – utilities include: arp, hostname, ifconfig, netstat, rarp, route, plipconfig, slattach, mii-tool, iptunnel and ipmaddr.
  26. ncat – improved re-implementation of the venerable netcat.
  27. netcat – networking utility for reading/writing network connections.
  28. nethogs – a small ‘net top’ tool.
  29. Netperf – Network bandwidth Testing.
  30. netsniff-ng – Swiss army knife for daily Linux network plumbing.
  31. netstat – Print network connections, routing tables, statistics, etc.
  32. netwatch – monitoring Network Connections.
  33. ngrep – grep applied to the network layer.
  34. nload – display network usage.
  35. nmap – network discovery and security auditing.
  36. nslookup – query Internet name servers interactively.
  37. ping – send icmp echo_request to network hosts.
  38. route – show / manipulate the IP routing table.
  39. slurm – network load monitor.
  40. snort – Network Intrusion Detection and Prevention System.
  41. smokeping –  keeps track of your network latency.
  42. socat – establishes two bidirectional byte streams and transfers data between them.
  43. speedometer – Measure and display the rate of data across a network.
  44. speedtest-cli – test internet bandwidth using
  45. ss – utility to investigate sockets.
  46. ssh –  secure system administration and file transfers over insecure networks.
  47. tcpdump – command-line packet analyzer.
  48. tcptrack – Displays information about tcp connections on a network interface.
  49. telnet – user interface to the TELNET protocol.
  50. tracepath – very similar function to traceroute.
  51. traceroute – print the route packets trace to network host.
  52. vnStat – network traffic monitor.
  53. wget –  retrieving files using HTTP, HTTPS, FTP and FTPS.
  54. Wireless Tools for Linux – includes iwconfig, iwlist, iwspy, iwpriv and ifrename.
  55. Wireshark – network protocol analyzer.



Posted in *nix, *nix-tools, cURL, dig, Internet, nmap, Power User, SpeedTest, ssh/sshd, tcpdump, Wireshark | Leave a Comment »

curl/wget: use content-disposition for the file names

Posted by jpluimers on 2020/04/27

For me, on Windows, curl works better than wget, but on Linux/Mac OS X, curl tends to work better. Some people find wget easier for downloading multiple URLs at the same time. So here the parameter switches for both so they download to the file specified by the Content-Disposition http header:

  • curl --remote-name --remote-header-name
  • wget --content-disposition

My experience is that wget is better at this, especially when redirects are involved (by adding a [WayBack] --location parameter to  thecurl command line).

So for instance the first fails, but the second succeeds determining the download to be VSCodeUserSetup-x64-1.27.2.exe (so curl keeps the name stable):

curl.exe --location --remote-name --remote-time --remote-header-name

wget.exe --content-disposition

This takes into account the name after all followed redirects.



Posted in *nix, cURL, Power User, wget | Leave a Comment »

20 Cool Command Line Tricks for Windows and macOS

Posted by jpluimers on 2019/11/08

After all these years in the field, I still learned new tricks from [WayBack20 Cool Command Line Tricks for Windows and macOS which I have rephrased:


1) View installed drivers: [WayBack] driverquery

2) Watch Star Wars in ASCII: [WayBacktelnet

3) Save folder trees to disk: tree (I had totally forgotten about this, probably because it leaves out a lot of directories and files)

5) Show your Wi-Fi password [WayBacknetsh wlan show profile SSID key=clear (replace SSID with your network name; use nets wlan show profile to view the network names)

7) Check your laptop’s battery health: [WayBack] powercfg /batteryreport which will be in ” and hit Enter to generate the report, then %HOMEPATH%\battery-report.html

8) View your Windows license key: wmic path softwarelicensingservice get OA3xOriginalProductKey [WayBack]

Mac OS X / macOS / however it is called now

1) Change the default screenshot type: [WayBackdefaults write type JPG (you can also use JP2 (for JPEG2000), PDF, PNG, TIFF and others)

2) Get your Mac to speak to you: use say

3) Add a message to the login screen: sudo defaults write /Library/Preferences/ LoginwindowText "your new text on the logon window" [WayBack]

4) Play Tetris and other classics: start emacs, then press Esc followed by X, type in tetris, pong, snake or solitaire (to exit emacs, press CtrlX followed by CtrlC). There are [WayBack] more emacs games.

5) Get a dictionary definition: run curl dict:// (where word is what you are after) which uses the [WayBack] dict protocol

6) Keep macOS awake: [WayBack] caffeinate optionally followed by a -t## parameter where ## is the number of seconds to not sleep.

7) Show hidden files: defaults write AppleShowAllFiles -bool TRUE; killall Finder or use this AppleShowAllFiles script which I had forgotten about writing in the first place.

10) Add Spaces to the Dock: defaults write persistent-apps -array-add ‘{”tile-type”=”spacer-tile”;}’; killall Dock running the command as many times as you want spaces. To get rid of a space you’ve added, just drag them to the Trash.


via: [WayBack] 20 Cool Command Line Tricks for Windows and macOS – Joe C. Hecht – Google+

Posted in *nix, *nix-tools, Apple, cURL, Power User | Leave a Comment »

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