![DSCF5361[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/DSCF53611-550x230.jpg "Processing Videos with ffmpeg and Lightroom")
On occasion I wondered how to apply advanced photo filters to my lackluster GoPro and drone videos. You know, not the basic exposure/contrast/saturation or the cheesy special effects you find in video editors, but something …
Read the full story »![DSCF5361[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/DSCF53611-100x65.jpg "Processing Videos with ffmpeg and Lightroom")
![Cat-Devouring-A-Bird-Pablo-Picasso[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/Cat-Devouring-A-Bird-Pablo-Picasso1-100x65.jpg "Searching Twitter")
![l5km2qq7sz7bbvg5pra24eygsdp-2[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/l5km2qq7sz7bbvg5pra24eygsdp-21-100x65.jpg "Bulk Create Linux Users using Salt")
![IMG_5456-scaled[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/IMG_5456-scaled1-100x65.jpg "Checking Linux Account Password")
![IMG_5435[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/IMG_54351-100x65.jpg "Coronavirus Stats in Bash")
Applications, Featured »
Processing Videos with ffmpeg and Lightroom
![DSCF5361[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/DSCF53611-150x150.jpg "Processing Videos with ffmpeg and Lightroom")
On occasion I wondered how to apply advanced photo filters to my lackluster GoPro and drone videos. You know, not the basic exposure/contrast/saturation or the cheesy special effects you find in video editors, but something you can do to a photo in, say, Photoshop or Lightroom.
Searching Twitter
![Cat-Devouring-A-Bird-Pablo-Picasso[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/Cat-Devouring-A-Bird-Pablo-Picasso1-80x80.jpg "Searching Twitter")
Here are just a few hopefully useful tips for searching Twitter to get more relevant results.
Bash Scripts and MySQL
![1fxshw1sngujguztkvexhxu0no9-2[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/1fxshw1sngujguztkvexhxu0no9-21-80x80.jpg "Bash Scripts and MySQL")
I frequently use MySQL to store data collected or processed by various shell scripts. The database comes in handy when massaging data with good old awk and sed gets too cumbersome.
Bulk Create Linux Users using Salt
![l5km2qq7sz7bbvg5pra24eygsdp-2[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/l5km2qq7sz7bbvg5pra24eygsdp-21-80x80.jpg "Bulk Create Linux Users using Salt")
Recently I ran into a situation where hundreds of VMs recently built via OpenShift/Ansible automation were missing an important local user account used for security audits. While our automation guys were working on tracking down …
Checking Linux Account Password
![IMG_5456-scaled[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/IMG_5456-scaled1-80x80.jpg "Checking Linux Account Password")
On occasion you may need to check if an account has a specific password. For example, when you build VMs, you may use some default passwords for some default accounts (i.e. root) that should be …
Coronavirus Stats in Bash
![IMG_5435[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2020/10/IMG_54351-80x80.jpg "Coronavirus Stats in Bash")
The result of my morbid fascination with the coronavirus situation is this quick bash script that parses Johns Hopkins University coronavirus data to generate a quick report for the current date for the specified countries.
Updating Lynis
Lynis is an excellent security audit tool for Linux and various Unix derivatives. I have a small wrapper script that runs Lynis via a cron job, does a selective diff with the previous run’s output, …
Hiding Passwords
I’ve touched on this subject previously, but suddenly felt I should repeat myself. The big issue with using passwords from command line is shell history.
Convert Code Snippets to PNG
On occasion I find myself struggling posting code on discussion forums that don’t handle code formatting all that well. What would’ve helped is some quick and easy way to convert code to an image file …
Backup Options for Raspberry Pi
Just about every Raspberry Pi I used suffered the same fate: the micro SD card died. It is generally accepted that the expected lifespan of an SD card is around ten years of normal use.
Affordable Linux Server
A friend asked me what server I would recommend to run Linux. Yes, a very broad query. After a few followup questions we’ve determined the server will be used to run VMs, or Apache, or …
Backing Up WSL Images
Microsoft’s WSL is interesting. I’d go as far as to say that I like it. The mistake here would be to forget that your Linux image is running under Windows, with everything this entails. Making …
Home-Brew Ransomware Defense
The first well-known case of ransomware was documented in 1989. The so-called AIDS Trojan was delivered on a floppy disc; encrypted data; demanded $189.00 (nearly four hundred bucks in today’s money) as a “license fee”. …
Validating HTTPS Cache Peers for Squid
![sy2zeb1vp2h8itlxfbbylw0jrm0[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2019/12/sy2zeb1vp2h8itlxfbbylw0jrm01-80x80.jpg "Validating HTTPS Cache Peers for Squid")
I have a squid proxy server that uses a long list of authenticated cache peers in a round-robin configuration. The process looks something like this:
Updating PHP 5.6w to 7.1u on CentOS 6.10
![wvtchvkz4f4ua8we5yngswc1mkd[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/wvtchvkz4f4ua8we5yngswc1mkd1-80x80.jpg "Updating PHP 5.6w to 7.1u on CentOS 6.10")
This is mostly just a note to self. As I mentioned previously (probably more than once), I very much dislike systemd and will stick with CentOS 6 for as long as possible. Having said that, …
Analyzing atop Logs with atopsar
![0h7vjqy3irb9p63bjuuxvd0tq85[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/0h7vjqy3irb9p63bjuuxvd0tq851-80x80.jpg "Analyzing atop Logs with atopsar")
I have discussed atop previously but concentrated primarily on how to run it and how to collect data. Now I’d like to spend some time talking about ways to analyze the data collected with atop.
Appending Filenames
![gk5arsj5ijgmshcbh73vvpkdh2k[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/gk5arsj5ijgmshcbh73vvpkdh2k1-80x80.jpg "Appending Filenames")
If you google how to append, say, current timestamp to the filename in Bash, almost every suggestion boils down to something really basic along the lines of mv $somefile $somefile_$(date +’Y%-%m-%d’). Technically, this is correct …
Verifying SNMP Connectivity on Multiple Hosts
![Photo-2019-10-07-14-39-03_0266[1]](https://i1.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/Photo-2019-10-07-14-39-03_02661-80x80.jpg "Verifying SNMP Connectivity on Multiple Hosts")
I needed to check if SNMP was accessible on whatever live servers that existed in a particular subnet. Here’s a quick script to do this.
Selecting Time Ranges from Logs, Part 2
![4bbqfrqoa4vxlgrr02pg883ozks[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/4bbqfrqoa4vxlgrr02pg883ozks1-80x80.jpg "Selecting Time Ranges from Logs, Part 2")
A couple of years ago I wrote an article about selecting specific time ranges from log files. I proposed two options: either convert all timestamps to epoch format (a CPU-intensive process) or rely on regex …
Bulk-Adding IPTables Rules
![b3gk9tc9x14ki5xa4bx8c4v1b66[1]](https://i0.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/b3gk9tc9x14ki5xa4bx8c4v1b661-80x80.jpg "Bulk-Adding IPTables Rules")
I’ve been using my mod of this handy script to block countries with iptables. One issue with the script is that it is adding rules one-by-one using the iptables -A syntax. This is the proper …
Automatically Block Frequent Visitors
![gea59uduencunzibzb6i3gxn36m[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/gea59uduencunzibzb6i3gxn36m1-80x80.jpg "Automatically Block Frequent Visitors")
I had a few similar scripts floating around this site, but this one is a bit more all-inclusive and better organized. The script will analyze your firewall/whatever access log and block particularly active visitors.
Windows 10 Upgrades
![img_0002[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/img_00021-80x80.jpg "Windows 10 Upgrades")
I did the only sensible thing and disabled automatic updates on my two Windows 10 laptops. Microsoft’s belated foray into the world of CI/CD for releasing Windows patches suffers from limited automated testing.
Detecting Blurry Photos with ImageMagick
![ll7je7yy7kvxsiw8ibssm0nmqf0-2[1]](https://i2.wp.com/www.krazyworks.com/wp-content/uploads/2019/11/ll7je7yy7kvxsiw8ibssm0nmqf0-21-80x80.jpg "Detecting Blurry Photos with ImageMagick")
Here’s a typical scenario: I go to a birthday party where everyone knows I’m a shutterbug, so I have to bring my camera. As time goes by and blood alcohol concentration rises and attention to …
Commands & Shells »
Bulk Create Linux Users using Salt
Recently I ran into a situation where hundreds of VMs recently built via OpenShift/Ansible automation were missing an important local user account used for security audits. While our automation guys were working on tracking down …
Coronavirus Stats in Bash
The result of my morbid fascination with the coronavirus situation is this quick bash script that parses Johns Hopkins University coronavirus data to generate a quick report for the current date for the specified countries.
Applications »
Searching Twitter
Here are just a few hopefully useful tips for searching Twitter to get more relevant results.
Bash Scripts and MySQL
I frequently use MySQL to store data collected or processed by various shell scripts. The database comes in handy when massaging data with good old awk and sed gets too cumbersome.
Data »
Bulk Create Linux Users using Salt
Recently I ran into a situation where hundreds of VMs recently built via OpenShift/Ansible automation were missing an important local user account used for security audits. While our automation guys were working on tracking down …
Checking Linux Account Password
On occasion you may need to check if an account has a specific password. For example, when you build VMs, you may use some default passwords for some default accounts (i.e. root) that should be …
Monitoring »
Analyzing atop Logs with atopsar
I have discussed atop previously but concentrated primarily on how to run it and how to collect data. Now I’d like to spend some time talking about ways to analyze the data collected with atop.
Verifying SNMP Connectivity on Multiple Hosts
I needed to check if SNMP was accessible on whatever live servers that existed in a particular subnet. Here’s a quick script to do this.
Networking »
Validating HTTPS Cache Peers for Squid
I have a squid proxy server that uses a long list of authenticated cache peers in a round-robin configuration. The process looks something like this:
Verifying SNMP Connectivity on Multiple Hosts
I needed to check if SNMP was accessible on whatever live servers that existed in a particular subnet. Here’s a quick script to do this.
Editor
Igor
Sr. Unix SysAdmin with twenty years experience supporting Solaris, HP-UX, AIX, IRIX, and Linux servers in a large distributed environment.
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