I want to be a superhero, and also a ninja! Why choose?
Quick snippet, as I was searching for this one today.
You can output both standard and error output to both screen and log file with the below command:
my_command.sh 2>&1 | tee my_command.log
Explanation:
my_command.sh
2>&1
| tee
I’ve been quite busy this whole day with a partially complete database dump and wanted to prepare for tomorrow with some ninja bash voodoo shizzle. I’m doing a braindump here because I know I’ll have forgotten this when I wake up tomorrow 🙂
The command stated below was the first working example I’ve gotten together, please let me know if you know a neater / better solution!
I’ve got two files. The first file contains lines which need to be deleted from the second line (if they exist there) Continue reading “Remove duplicate lines while comparing two files”
This post is a distilled version of the discussion here: https://github.com/mitchellh/vagrant/issues/3740
When I started using the latest Puppetlabs boxes, I encountered the error “Error: Could not parse application options: invalid option: –manifestdir” when my puppet manifest was about to be executed. Continue reading “Puppet provisioning on Vagrant Error: –manifestdir”
This post will mostly serve as a reference for future posts, the goal is to create the simplest HTTPS webserver possible, which will serve to test certificates, authentication via private keys and in the end; configure SSL offloading to an Apache HTTPD, which will act as a proxy between your client and the secure endpoint.
GOAL: At the end of this article, you will have a running secure web server which you can access via your web browser and/or via an SSL client. Continue reading “Create a simple HTTPS server with OPENSSL S_SERVER”
This post is mostly a bookmark for myself. I’ve been using search engines way too often to find this command..
The command to remove a host from a knownhosts file without seeing the actual hostname in the knownhosts file is the following:
[code]ssh-keygen -R HOSTNAME[/code]
Continue reading “Remove host from SSH KnownHosts file without seeing the hostname”
Sed is very very powerful, which is a good thing to be aware of.
I was looking to compare the output of a sed command to the original file before I wanted to execute the sed command directly on the file and came across this handy trick.
It works by using temporary named pipes inside the diff command.
Contents of file:
[code title=”contents of numbers.txt:”]
One
Two
Three
Four
Five
[/code]
If I just want to remove the line which begins with “Four”, I can check my sed command like this:
[code title=”Terminal output:”]
joris@beanie ~
$ diff <(sed ‘/Four/d’ numbers.txt) numbers.txt
3a4
> Four
[/code]
Awesome possum, now I know my sed command won’t destroy anything.
This approach works in several distros, I’ve been using it in Ubuntu for a while and just used it in Fedora as well.
As a developer, you might need to switch between java versions often, this approach will come in handy then.
We will be using the command “alternatives”, in this case to check the configuration of your Java installation. The default is most often OpenJDK, while you might need Oracle Java.
Run “alternatives –display java” to see which versions you can currently choose from:
[code gutter=”false”]
[joris@today ~]$ alternatives –display java
java – status is manual.
link currently points to /usr/java/latest/bin/java
Current `best’ version is /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-3.b13.fc21.x86_64/jre/bin/java.
[joris@today ~]$
[/code]
There’s no Oracle Java yet, make sure you’ve installed Oracle Java. If you haven’t, you can check this blog post: Install Oracle Java in Fedora, Red Hat or CentOS using Yum and RPM
When Oracle Java is installed, you can add it to your alternatives: “sudo alternatives –install /usr/bin/java java /usr/java/latest/bin/java 20000”
Please note: I used “latest” in the command above, another options is to specifically set the version you want. This way you can install several JDK’s and switch as shown below.
When that is finished, you can select your current flavour of Java:
[code gutter=”false”]
[joris@today ~]$ sudo alternatives –config java
There are 2 programs which provide ‘java’.
Selection Command
———————————————–
* 1 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-3.b13.fc21.x86_64/jre/bin/java
+ 2 /usr/java/latest/bin/java
Enter to keep the current selection[+], or type selection number:
[/code]
Choose the option you want to switch between Java versions.
As mentioned by enkouyami, please check if you need to use update-java-alternatives instead of alternatives. The use of alternatives was valid when I wrote the post, but might not be working anymore!
This is a fairly handy trick.
I’m always logging in to different servers, which all have a different location for their logs. With this trick you can login and just type “cd logs” from anywhere.
First we will add our directory to the CDPATH variable:
[code language=”Bash”]
joris@badattitude /data/share/my_domain
$ echo $CDPATH
joris@badattitude /data/share/my_domain
$ export CDPATH=/data/share/my_domain
joris@badattitude /data/share/my_domain
$ echo $CDPATH
/data/share/my_domain
[/code]
Then we’ll check if it is working:
[code language=”Bash”]
joris@badattitude ~
$ cd logs
/data/share/my_domain/logs
joris@badattitude /data/share/my_domain/logs
$
[/code]
Awesome, we’ve arrived in our logs directory straight from our homedir!
This article shows how to execute remote commands via ssh, but you’ll send the commands from your own shell.
[code highlight=”1″]
ssh my_server ‘ls -l /home/my_home_dir’
[/code]
This will result in this output:
[code highlight=”1″]
$ ssh ae2 ‘ls -lha ~’
total 36K
drwxr-xr-x 2 joris joris 4.0K Jan 23 11:42 .
drwxr-xr-x. 5 root root 4.0K Jan 23 11:41 ..
-rw-r–r– 1 joris joris 54 Jan 23 11:41 .bash_logout
-rw-r–r– 1 joris joris 507 Jan 23 11:41 .bash_profile
-rw-r–r– 1 joris joris 213 Jan 23 11:41 .bashrc
-rw——- 1 joris joris 51 Jan 23 11:42 .history
-rw-r–r– 1 joris joris 171 Jan 23 11:41 .kshrc
-rw-r–r– 1 joris joris 375 Jan 23 11:41 .profile
-rw-r–r– 1 joris joris 153 Jan 23 11:41 .vimrc
[/code]
What’s even better, is that you can run multiple commands separated with a semi colon, like this:
[code highlight=”1″]
ssh my_server ‘ls -l /home/my_home_dir;whoami’
[/code]
And the best trick is this one, user input with an interactive command, sending input and output back and forth!
[code highlight=”1″]
ssh -t my_server ‘vi ~/.bash_profile’
[/code]
Everybody knows that the java executable is located in /usr/bin/java , but what if you need the JDK / JRE location itself?
Just using “whereis” will not get you there, that will point you to the /usr/bin/java point.
So, let’s find out a but more about /usr/bin/java:
ls -l /usr/bin |grep java
Awesome, this will lead us somewhere, it’s a symlink to /etc/alternatives/java
So let’s do the same there:
ls -l /etc/alternatives/ |grep java
And we’ve hit the jackpot, among the lines here, there’s a bunch of lines pointing us to the JRE location:
As you can see in the screenshit, our java executable within the JRE location is:
/usr/lib/jvm/java-7-oracle/jre/bin/java
Which means the JRE location is:
/usr/lib/jvm/java-7-oracle/jre