Completely uninstall and reinstall OpenJDK

Question

The following works fine when I type it exactly in the command line:

find /<some_path>/{epson,epson_laser,epson_inkjet} -iname "*.ppd" 
  -exec grep "\*ModelName\:" {} \; | sed 's/.*\"\(.*\)\"/\1/'

However, when I try to call the following from a bash script I get find: missing argument to -exec'.

I have also tried the following (in many variants):

eval find "$1" -iname "*.ppd" -exec 'bash -c grep "\*ModelName\:" "$1" | sed "s/.*\"\(.*\)\"/\1/" \;

as was mentioned in find-exec-echo-missing-argument-to-exec. How can I get to work first code not only in terminal, but also in bash script?

P.S.: I've used eval only for expanding string "/<some_path>/{epson,epson_laser,epson_inkjet}" to multiple paths. Does anyone know better solution for doing this?

Solution 1

You cannot remove OpenJDK 7 because it is not installed. If you are trying to remove OpenJDK 6, try sudo apt-get remove openjdk-6-jdk, or sudo apt-get remove default-jdk.

apt-cache search only shows you available packages, not the packages you have installed. For that, try sudo dpkg --list; sudo dpkg --list | grep -i jdk will show you any JDK-related packages installed on your system.

Solution 2

Run this command, which lets you choose which Java installation to make the default:

sudo update-alternatives --config java

---

There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                           Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java   1061      auto mode
  1            /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java   1061      manual mode
  2            /usr/lib/jvm/java-7-oracle/jre/bin/java         1         manual mode

Solution 3

Recently, I tried to reinstall Java completely. This may help you to remove it:

sudo apt-get remove openjdk*
sudo apt-get clean

Then, if you want, install Java:

sudo apt-get install openjdk-8-jdk

Following these steps helped me to solve my problem.

Comments

[Mr Lou]

get the answer: sudo dpkg --list; sudo dpkg --list | grep -i jdk thanks @izx

[Barmar]

That error means that the \; argument isn't being seen, but it looks fine to me above. Please paste the exact find line from your script.

[Mephi_stofel]

Well, doesn't matter which find line in script as no one works ;) But how to get the same result as in the first line I typed, but get it to work in bash script? the first line work when I type it directly to terminal, but in bash it in any combination doesn't work.

[Barmar]

When you use eval you have to double up the escapes. The first one escapes the character for the original shell, the second one escapes it for eval.

[Barmar]

That's why it's better to put the -exec command into a script, so you don't need to use eval.

[Barmar]

Actually, I'm not sure why you need to use eval in the first place.

[gniourf_gniourf]

Maybe you should also tell us what you're really trying to achieve. We could find the best approach to your problem.

[Mr Lou]

How can i search the packages i installed?What is the difference between packages available and packages installed?

[Mr Lou]

I try both commend you post,get the same results: Reading package lists... Done Building dependency tree Reading state information... Done Package default-jdk is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 182 not upgraded.

[ish]

Please update question with output of sudo dpkg --list | grep -i jdk. Available means "CAN BE installed after downloading" while installed means "IS installed on your system"

[Mr Lou]

thanks @izx i successed remove openjdk.How can i close the question.

[ish]

Please remember to accept the answer if it helped -- this will also close the question. Thanks :)