Bash: Javac: Command Not Found???

hello everyone
I'm new with Linux,,I tried to install java by using the instructions in the link below

https://www.youtube.com/watch?v=ohmZu3U9DYk

the only problem appeared in the last step "java -version" is:



neaam@neaam-desktop:~$ java -version
bash: /usr/bin/java: cannot execute binary file

can anyone help me?

I am new in java. I executed a java program using eclipse. the program contain two java file. when i try to run it using terminal in Ubuntu.
two files are not linking. it shows error. i am attaching all the data.

It shows the following error
Code:

regex2string.java:83: error: cannot find symbol
	                    str = randomstr.nextString(2000);
	                          ^
  symbol:   variable randomstr
  location: class regex2string
1 error
Exception in thread "main" java.lang.NoClassDefFoundError: regex2string
Caused by: java.lang.ClassNotFoundException: regex2string
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
Could not find the main class: regex2string. Program will exit.

Hello am a newbie to linux,
I tried to install cygwin for windows,all i need is i need to write a shell program for a batch file i already have, I am not able to do this.
My batch file content looks like

SET JAVA_HOME=..\jdk
SET CLASSPATH="%CLASSPATH%;../lib/A.jar;../lib/slf4j-api-1.6.1.jar;../lib/slf4j-simple-1.6.1.jar"

%JAVA_HOME%\bin\java.exe com.A ../conf/C.properties

PAUSE

this works perfectly, I try to write a shell program which is failing when i check it through cygwin. i am not able to set the export to java_home.
The pblm i face is say my current directory where my shell program is 'Z'
then i want to get back to 'y' where X has two sub folders y and z

X
-Y (is jdk )
-Z (where shell pgm resides)

cd ../ or any combination of cd doesnot work in my shell script.

Please help me. Any help is greatly appreciated

Hello,

I am trying to run a java application, but i'm getting an error when running my run.sh

This is my run.sh
Code:

java -classpath bin:deps/poi.jar:deps/mysql.jar:deps/mina.jar:deps/slf4j.jar:deps/slf4j-nop.jar:deps/jython.jar:log4j-1.2.15.jar server.Server

Here is the error while running run.sh
Code:

Exception in thread "main" java.lang.UnsupportedClassVersionError: server/Server : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: server.Server.  Program will exit.

Thanks

I probably do something wrong with $PATH when install Java JDK. Now when I type
startx, reboot, which,... I get command not found.

When I type: echo $PATH
It shows only: /usr/local/java/bin

Ok yes this is a homework assignment BUT I am NOT looking to have the answers given to me. I am in the 6th week of my first Linux class ever and we are in our few weeks of beginning scripting. I have some ideas of what to do or where to start but not many and no one to bounce any ideas off...we are using UNIX Bash shell so any others I have no clue. The scenario is that I need a script that searches all my users home directories for bad words. I need the script to report to the screen certain info like username and word found and path. It should ask a user if it is good or bad and if bad be put into a file of list of bad file names, if good remove from list and no longer flagged by the script. What I have so far is wanting to somehow do a loop. I do know that if I do a grep -r -e kill -e steal /home/* I get a list of what I need. I also know that the list is separated by delimiters which I can pipe to get a variable for the things I need. I also know that I can put it to a file with a > filename.txt

What I have no clue is how to start a loop that would do this...

for each line in filename.txt
UNAME=...
LOC=...
TXT=...
echo "Username: $UNAME, Line with bad word found: $TXT, and Path and file name: $LOC. Is this a BAD file? (Y)"
Read YORN

if ["$YORN" = "Y" ]; then
>> (line of text from grep) badfiles.txt
fi

Next or whatever goes there...sorry if this is crazy I just really need some direction. I am trying to learn so please don't give me the answer...that will do nothing for me and I will not be able to explain the code I came up with.

Hi,

I installed ghostscript via yum package manager. Later I wanted a newer version of ghostscript and compiled it from source. "make install" placed the gs executable file under /usr/local/bin/gs. This works if I run the command with absolute path, but if try to run gs, the shell will output

"-bash: /usr/bin/gs: No such file or directory"

if I echo the path variable it will display

/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin

If i run whereis it will give me the correct path
gs: /usr/local/bin/gs

How do I make it work so that typing "gs" will run the executable file from the /usr/local/bin/gs?

(I am using Centos 6)

Thanks.

hi,

I am newbie in Linux shell scripting.Can anybody help me to check the presence of file identified by variable in Shell scripting?

For example: I am reading the content of a file using while command as below:
"while read -r line
do
code block
done < file_name"

Now in this case every line in file gets stored in the variable 'line' one by one.Problem here is every line in the file is nothing but the file_path of another file say xyz.txt and I am checking presence of this xyz.txt file using below command:
if [-f $line]
as 'line' is the variable which stores file path of xyz.txt but it is not working. It is unable to check the presence of this xyz.txt file as i am addressing it with the variable 'line'.

Please help me.Thanks in advance.

Hello,

I'm looking for options/tools where I can get server performance counters for Linux OS (having Java application on it). For windows based platforms, we have PerfMon that provides this data. I'm looking for a similar tool for Linux platform java apps. Could you please help me in identifying the best options to get the performance related data like Perfmon?

Thanks,
NR

Hy,
I am new to linuxquestion.org, however i am mid-level linux administrator.

As per my scenario, I want to cluster python and java services in two nodes running RHEL 6.4. Till now by watching tutorial I have seen application level clustering of linux for eg: webserver, mysql database and so on. However I haven't found any with python & java clustering.
I am already familiar with windows clustering having clustered ip of the two nodes. In my scenario, we have both the options open either going with active-active or active-passive cluster. So I want to some sort of idea to achieve linux os clustering and hence obtained clustered ip.
Further any idea on how this service will float from one node to another. Further, I cannot get to the fencing mechanism in Linux. Any idea for this will be helpful to understand.

Hope to get positive respond ASAP. Thanks in advance for those who help me with this.