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Category Archives: shell
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[one-liner]: Working with ssh-keygen & SSH Key Pair Files
Background
Here are some typical examples for creating ssh RSA key files. SSH keys are generated & modified using the command ssh-keygen.
Example #1 – defaults
For starters here’s what happens when you run ssh-keygen with just it’s defaults:
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% ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/jaml/.ssh/id_rsa):
Enter passphrase (empty for no […] Continue reading
Posted in linux, one-liner, Security, shell, ssh, Syndicated, tips & tricks
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[one-liner]: Working around the SSH error message: Too many authentication failures for root
Background
Yesterday I ran into an issue while trying to ssh to one of my computers. I started getting this error, Too many authentication failures for root. At first I thought it has something to do with PAM or some sort of login detection protection related to /var/log/btmp (a log file maintaining bad login attempts). Turns […] Continue reading
Posted in linux, one-liner, Security, shell, ssh, Syndicated, sysadmin, tip, tips & tricks
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[one-liner]: Calculating Disk Space Usage for a List of Files Using du under Linux
Background
Being the most techie of my group of friends I often get other people’s problems dumped into my lap when something goes wrong with their computer. I generally don’t mind since it gives me the opportunity to help out a friend and work on some obscure problems, such as:
* issue #1: laptop no longer works, […] Continue reading
Posted in backup, linux, one-liner, shell, Syndicated, sysadmin, tip, tips & tricks
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[one-liner]: Working with VMware ESXi 3.5 via the command line
Background
Recently I’ve been getting more hands on experience with VMware ESXi 3.5 at my day job. It seems pretty capable in it’s free version form. After familiarizing myself with the command line shell over the last few days it’s finally starting to make sense. If you’ve worked on any Red Hat distros such as Fedora/CentOS/RHEL […] Continue reading
Posted in one-liner, server, shell, Syndicated, sysadmin, tip, tips & tricks, virtualization, vmware
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[one-liner]: How to make CD & DVD .iso images from physical CDs/DVDs on Linux via the Command Line
Background
Quick tip on how to make CD & DVD .iso images from physical CDs/DVDs via the command line.
Solution
There are many ways but these are probably the 2 more common ones.
using the cat command
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% cat /dev/dvd > ~/image1.iso
using the dd command
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% dd if=/dev/dvd of=~/image1.iso bs=2048
NOTE: On my Thinkpad 410 laptop my CD/DVD drive has the […] Continue reading
Posted in linux, one-liner, shell, Syndicated, sysadmin, tip, tips & tricks
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How to use rvm installs of Ruby in shell & CGI scripts
Background
Before I get started some quick defninitions:
Ruby : a programming language
rvm : Ruby Version Manager, tool for managing rubies
If you’ve had to work with multiple versions of Ruby in the past, the power of rvm is very compelling. Gone are the headaches of trying to get multiple versions to coexist nicely on a single box. […] Continue reading
Posted in programming, Ruby, rvm, shell, Syndicated, sysadmin, tip, tips & tricks
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[one-liner]: Copying a Subset of Files in a Directory using cpio
Background
Recently I needed to make copies of a bunch of files: .mp3, .doc, .xls, .ppt, and .jpg from an old windows hard drive. This gave me a chance to try out my recently purchased Rosewill SATA or IDE 3-in-1 (5.25″, 3.5″, 2.5″) to USB2.0 Cable Converter Adapter (part#: RCW608). The product url is here.
Rosewill Setup
The […] Continue reading
Posted in one-liner, shell, Syndicated, sysadmin, tip, tips & tricks
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[one-liner]: Previewing a Pretty Printed Text File using enscript & ps2pdf
Background
Before my wife and I had kids we thought it would be nice to collect the United States quarters that were released during 1999 through 2008 to commemorate each of the 50 states. Seemed like something simple to do and would be a nice gift for the kids when they got older. So we bought […] Continue reading
Posted in one-liner, shell, Syndicated, tips & tricks
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[one-liner]: Copying & Moving Files efficiently with xargs
Background
From time to time I need to move and/or copy a subset of files from one directory to another. I typically would use something like one of these to do the task:
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#– COPY
find . -type f -ctime -1 | xargs -I {} cp {} /some/other/directory
#– MOVE
find . -type f -ctime -1 | xargs -I {} […] Continue reading
Posted in one-liner, shell, Syndicated, tips & tricks
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[one-liner]: How to Use the Bash Shell’s export Command
Problem
Recently at my day job I’ve been having to go through some pretty old Bash scripts that I’ve basically inherited. As I’ve been going through them I’ve been seeing a lot of confusion as to the proper use of Bash’s export command. The major offense? Not really understand whether a particular variables needs to be […] Continue reading
Posted in bash, one-liner, shell, Syndicated, tip, tips & tricks
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