I have a process I want to start from Java. The problem is that due to a mismatch between the remote desktop client and the process I want to start I need to modify the environment variables. I will not use this in production, but only for running tests. I will also just do this until this bug is fixed in the tool I use.  I do not have root access and I am using Linux RHEL7. Anyone having an idea how I can set this environment variable from Java? I should also add that I run this from an IDE.  The following answer was not very helpful due to the lack of actual examples:   and the following example was not able to set the variables in the scope I needed to set them:   I tried this,  Process p = Runtime.getRuntime().exec("setenv " + name + " " + value);   But get the following error message,  java.io.IOException: Cannot run program "setenv": error=2, No such file or directory   EDIT: Someone suggested this post,    Unfortunately I do not find any solutions in there. The process I want to start already have a Java API, which does not work in my environment. What I want is an equivalent to the linux command,  setenv NAME VALUE   for the process which java runs in.
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How do I set environment variables from Java?  I see that I can do this for subprocesses using . I have several subprocesses to start, though, so I'd rather modify the current process's environment and let the subprocesses inherit it.  There's a System.getenv(String) for getting a single environment variable. I can also get a Map of the complete set of environment variables with System.getenv(). But, calling put() on that Map throws an UnsupportedOperationException -- apparently they mean for the environment to be read only. And, there's no System.setenv().  So, is there any way to set environment variables in the currently running process?  If so, how?  If not, what's the rationale?  (Is it because this is Java and therefore I shouldn't be doing evil nonportable obsolete things like touching my environment?)  And if not, any good suggestions for managing the environment variable changes that I'm going to need to be feeding to several subprocesses?
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In Windows 7, when I start the Command prompt, is there any command to display the contents of an environment variable (such as the JAVA_HOME or PATH variables)?  I have tried with echo $PATH, echo PATH and $PATH but none of these work.
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I have been working on several projects, and they require different environment variables (e.g., PATH for different versions of clang executables, PYTHONPATH for several external modules). Whenever I work on one project, I have to modify these environment variables myself (e.g., change .zshrc/.bashrc and source it); and I sometimes forget and make mistakes.  Is there a way/project that helps do this automatically, similar to what  does in Python?
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java program is not running on my windows 10 pc.  C:\Users\Antony&gt;set path=C:\Program Files (x86)\Java\jre1.8.0_171\bin  C:\Users\Antony&gt;cd Desktop  C:\Users\Antony\Desktop&gt;javac helloworld.java 'javac' is not recognized as an internal or external command, operable program or batch file.  C:\Users\Antony\Desktop&gt;  environment path =C:\Program Files (x86)\Java\jre1.8.0_171\bin   C:\Users\  java -version java version "1.8.0_171" Java(TM) SE Runtime Environment (build 1.8.0_171-b11) Java HotSpot(TM) Client VM (build 25.171-b11, mixed mode, sharing)   still showing same error
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Is there an easy way to substitute/evaluate environment variables in a file? Like let's say I have a file config.xml that contains:  &lt;property&gt;     &lt;name&gt;instanceId&lt;/name&gt;     &lt;value&gt;$INSTANCE_ID&lt;/value&gt; &lt;/property&gt; &lt;property&gt;     &lt;name&gt;rootPath&lt;/name&gt;     &lt;value&gt;/services/$SERVICE_NAME&lt;/value&gt; &lt;/property&gt;   ...etc. I want to replace $INSTANCE_ID in the file with the value of the INSTANCE_ID environment variable, $SERVICE_NAME with the value of the SERVICE_NAME env var. I won't know a priori which environment vars are needed (or rather, I don't want to have to update the script if someone adds a new environment variable to the config file). Thanks!
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I have a bunch of piped shell commands that give some env output. I want to set these as env variables for an additional command to add to the chain  Kevins-MBP:ops kevzettler$ eb printenv | tail -n +2 | sed "s/ //g" NODE_ENV=staging RDSPassword=changme RDSHost=sa1c7quehy7pes5.lolol.us-east-1.rds.amazonaws.com RDSUsername=derp
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I tried to persist the environment variables for ORACLE in RedHat using /etc/environment.  It cleared my PATH variable; no command was recognized afterwards.  Why does it happen, since just executing the same commands in the shell just works fine?!   The contents of my /etc/environment:  ORACLE_HOME=/usr/lib/oracle/12.1/client64 PATH=$ORACLE_HOME/bin:$PATH LD_LIBRARY_PATH=$ORACLE_HOME/lib
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In my ~/.bashrc and ~/.profile I have some variables set to some filepaths:  export MY_VAR1="/path/to/somewhere"   In my ~/bin/ (which is added to my PATH) I have a few scripts that rely on those variables being set.  If I run those commands from the terminal, they work as expected.  However, if I try to double click on a script in Nautilus and run it, it runs as if those variables were not set.  Same thing happens if I add one of the scripts to Gnome's "Startup Applications" using the GUI utility or if I add them to the Gnome menu using the "Main Menu" GUI utility.  I would've thought that since I included these variables in my ~/.profile, which is run at login that gnome and nautilus and processes spawned by them would have access to those variables.  Both Gnome and Nautilus are run under my login user. All my scripts in ~/bin have the bash shebang at the top.  I am new to bash scripting, sorry if I am missing something obvious. I am using Debian Wheezy and Gnome3.
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I set some environment variables in a terminal, and then run my script. How can I pull in the variables in the script? I need to know their values. Simply referring to them as $MY_VAR1 doesn't work; it is empty.
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I know that VARIABLE=value creates an environment variable, and export VARIABLE=value makes it available to processes created by the current shell. env shows the current environment variables, but where do they live? What comprises an environment variable (or an environment, for that matter)?
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In Linux When I invoke python from the shell it replicates its environment, and starts the python process. Therefore if I do something like the following:  import os os.environ["FOO"] = "A_Value"   When the python process returns, FOO, assuming it was undefined originally, will still be undefined. Is there a way for the python process (or any child process) to modify the environment of its parent process?  I know you typically solve this problem using something like  source script_name.sh   But this conflicts with other requirements I have.
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Some context about the bug:      Bash supports exporting not just shell variables, but also shell   functions to other bash instances, via the process environment to   (indirect) child processes.  Current bash versions use an environment   variable named by the function name, and a function definition   starting with “() {” in the variable value to propagate function   definitions through the environment.  The vulnerability occurs because   bash does not stop after processing the function definition; it   continues to parse and execute shell commands following the function   definition.  For example, an environment variable setting of    VAR=() { ignored; }; /bin/id       will execute /bin/id when the environment is imported into the bash   process.   Source:   When was the bug introduced, and what is the patch that fully fixes it? (See )  What are the vulnerable versions beyond noted in the CVE (initially) (3.{0..2} and 4.{0..3})?  Has the buggy source code been reused in other projects?  Additional information is desirable.    Related:
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I looking into writing my own init.d scripts to control several services running on my Linux server. I came across an example online which contained:  nohup $EXEC_SCRIPT 0&lt;&amp;- &amp;&gt; $LOG_FILE &amp; echo $! &gt; $PID_FILE   From what I understand:   nohup Catches the hangup signal  $EXEC_SCRIPT is a variable containing the command to be run  0&lt;&amp;- &amp;&gt; Not come across this before $LOG_FILE similar to $EXEC_SCRIPT but contains the log file path &amp; starts logging to $LOG_FILE in the background? $! is the PID of the most last background command &gt; writes the result of $! to the $PID_FILE   I can work through it with this knowledge but the 0&lt;&amp;- &amp;&gt; is completely throwing me off. I don't like to include things that I don't at least partially understand first.
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I got the latest update from Windows that adds bash, and I was trying to script the execution of an Android emulator through this; however the Path variables of Windows are not taken into account for bash.  Plus I tried executing adb manually and I got:  andtest@DESKTOP:/mnt/c/Android/sdk/platform-tools$ exec ./adb.exe bash: /mnt/c/Android/sdk/platform-tools/adb.exe: cannot execute binary file: Exec format error   Is there something I'm missing here? I want to use this Windows computer as a test server for Android.
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How can I write a program in Java that will execute another program? Also, the input of that program should be given from our program and the output of that program should be written into a file.  This is my small set of code to get its output:  Process p = Runtime.getRuntime().exec("C:\\j2sdk1.4.0\bin\\helloworld.java"); BufferedReader input =         new BufferedReader(new InputStreamReader(p.getInputStream())); while ((line = input.readLine()) != null)    System.out.println(line);  input.close();   This was my set of code but this throws an IOException.
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I'm running Ubuntu 11.04. I use the terminal to start a bash session, and I want to add an environment variable:  $r@hajt:~$ env THEVAR=/example   But it's not working. It shows all the variables with THEVAR being the last one, but another call to env does not show THEVAR anymore- env | grep THEVAR returns nothing.  Similarly, scripts with export (export THEVAR=/example) or other variable assignments (THEVAR=/example) don't add the environment variable.  I know I'm doing something wrong, I know it should be something simple, but I just can't find what.  UPDATE: The real meaning of my question was this one:   (Anyway I'll choose the most voted answer and leave the edited title -that wasn't what I was asking)  env runs a program in a modified environment, then dismisses all the changes.
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I have a systemd file to start a jar file. But I want to execute jar file as *.jar. Is there a way to do this?   [Unit] Description=Test Background  [Service] ExecStart=/usr/bin/java -jar /var/www/test.com/*.jar Type=simple WorkingDirectory=/var/www/test.com  [Install] WantedBy=multi-user.target   I tried this but not working.