A set of dynamic variables that can affect the running processes.

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41
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4answers
2k views

Is there ever a good reason to run sudo su?

To launch a root shell on machines where the root account is disabled, you can run one of: sudo -i : run an interactive login shell (reads /root/.bashrc and /root/.profile) sudo -s : run a non-login ...
1
vote
1answer
28 views

Get value of environment variable in for loop

I have several environment variable pam_branch app_branch worker_branch I use an array to define different projects and I want to get the values of these env var by rebuilding them in a for loop ...
0
votes
1answer
571 views

How to specify a custom include directory in Debian?

I am trying to compile my program on a Debian system via ssh and without root privileges. PRETTY_NAME="Debian GNU/Linux 7 (wheezy)" NAME="Debian GNU/Linux" VERSION_ID="7" VERSION="7 (wheezy)" I ...
5
votes
2answers
2k views

How can I set env variables so that KDE recognizes them?

I need to set some environment variables such as the XDG spec ones, before KDE starts in such a way that kwin and any apps run from KDE will inherit them. Where could I do this, and how?
0
votes
1answer
29 views

What is the perfect combination of Environment Variables for Tomcat? [closed]

I hosted one application UI in apache-tomcat server. I had set environment variables in bin/setenv.sh file as: CATALINA_OPTS="-server -Xms256m -Xmx512m -XX:PermSize=512m -XX:MaxPermSize=1024m ...
2
votes
1answer
94 views

Finding out what sh is [duplicate]

I am writing a set of scripts that I want to be portable, but I need to know whether sh on the current platform stands for bash, ksh, or ash. Is there a clear way to do it? What comes to my mind ...
5
votes
0answers
27 views

Bash: How to avoid variable name substitution when using auto-completion?

I'd like Bash to stop removing variable names from paths and replacing them by their values. I tried several 'shopts' settings in various bash versions but was not successful in keeping a variable ...
1
vote
1answer
46 views

Why does bash parameter expansion not work inside systemd service files?

I am trying to use systemd's EnvironmentFile and add an option to the command when it is set in the file. I have the following in the unit file: ExecStart=/usr/bin/bash -c "echo ${PORT:+port is ...
0
votes
2answers
23k views

“not a valid identifier” when I do “export $PATH”

When I run export $PATH in bash, I get the error not a valid identifier. Why?
0
votes
1answer
61 views

Set Environment variable $PATH globally on Ubuntu 14.04

I am trying to add evironment path variable of composer globally. I've tried many ways but doesnot seem to work. Searched other posts but did not find matching answers. I am trying to work out ...
0
votes
1answer
31 views

When I execute a .run file as <user> it works fine. If I sudo run it, it cannot detect Java

I am trying to execute a .run file that will install some applications. I'm installing the application in /opt/... When I run it without sudo, the installer runs correctly but cannot write to /opt/. ...
1
vote
6answers
91 views

How can I pass an environment variable to a script?

Okay, I can display an environmental variable from the commandline: echo $COLUMNS And get a response. But I can't execute that from within a shell script, I get nothing. So, there must be a way to ...
0
votes
1answer
700 views

Installing netbeans on Scientific Linux- NoClassDefFoundError thrown from the UncaughtExceptionHandler in thread “main”

I'm installing netbeans 8.0.1 on Scientific Linux. I have executed the installer .sh but I get the error: java.lang.NoClassDefFoundError thrown from the UncaughtExceptionHandler in thread "main" ...
8
votes
2answers
10k views

How to reset a shell environment?

This issue has been bugging me for a while, and although I've taught I've found my answer through EnvWatcher, unfortunately it only works on Bash. And I use zsh. I would like to replicate the things ...
2
votes
1answer
60 views

Updating environment variable in a shell script

I am trying to update the value of an environment variable in a third party shell script. My OS is Oracle Linux Server release 6.4 (Red Hat Enterprise Linux Server release 6.4 (Santiago). I already ...
0
votes
0answers
95 views

glxinfo does not see environmental variables?

I am running following 32 bit command on 64 bit system: LIBGL_DEBUG=verbose glxinfo32 -v -t | head -5 It's output says direct rendering: No (If you want to find out why, try setting ...
1
vote
1answer
45 views

Configure tmux to use zsh

Right now I have my iTerm session configured to use zsh (/usr/local/bin/zsh), but I'm trying to configure tmux to use zsh as well, instead of /bin/bash/, which it's currently defaulting to. So far ...
5
votes
2answers
7k views

“No protocol specified” when running vim with sudo

Recently I start to get "No protocol specified" when using sudo vim. It's just a warning I guess, because everything was working normally (I can open, edit and save files). The message doesn't appear ...
3
votes
2answers
358 views

Where do EDITOR, PAGER, BROWSER environment variables come from?

When I look in man bash none of these are defined. However, random posts online refer to them; where do they come from? Or are they just a convention?
0
votes
1answer
11 views

OracleSolaris 11.2 - setting MANPATH variable

What is the right way to extend MANPATH in Solaris? Currently it is empty for a user session, so I get to do it manually in $HOME/.bash_profile: ...
3
votes
3answers
45 views

What's the 'right' format for the HTTP_PROXY environment variable? Caps or no caps?

I've encountered both http_proxy and HTTP_PROXY. Are both forms equivalent? Does one of them take precedence over the other?
1
vote
1answer
26 views

How to switch java environment for specific process?

I use openjdk in my work, but sometimes I need oracle's jre or even specific version of oracle's jre. As I know, I should update JAVA_HOME value and /usr/bin/java or /etc/alternatives/java link ...
4
votes
4answers
1k views

How can I make shell aliases available when shelling out from Vim?

In my .zshrc, I declare some aliases. Eg, which dbstart shows the contents of that alias. If I open vim from that shell, it is a child process. In Vim, I can run shell commands with :! some_command. ...
0
votes
1answer
31 views

How to change JAVA_HOME temprorary with env command

I use openjdk for my work, but sometimes I need oracle's JRE. I thought that I could use 'env' command for this, but can't figure out why it's not working. I have openjdk in ...
1
vote
1answer
30 views

How to append to an environment variable using an .env file?

Assuming the .env file is loaded before execution, how can you append to it without overriding it? DEBUG=True FOO=BAR PYTHONPATH="/Users/James/project/" The above file would (?) override it, and ...
1
vote
1answer
39 views

Magic environment variables in gnome-terminal

I had installed a proxy software (cntlm) on my machine. It sets the environment variable http_proxy to 127.0.0.1:3128. Now I've uninstalled the program using apt-get remove cntlm. However I'm able ...
0
votes
2answers
33 views

Does kali distro not use /etc/environments file?

I appended a path to /etc/environments file and now it is like so: mindaugas@Kali:~$ cat /etc/environment | tr ":" "\n" PATH="/usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin /sbin" I ...
1
vote
1answer
42 views

How do I add an installed program to my PATH so I can run it from the command line?

I installed jsx using npm: npm install -g jsx Now it installed jsx in this path: /node_modules/lib/node_modules/jsx/bin In the bin, I'm having jsx. Now if type ./jsx, it works fine as expected. ...
1
vote
4answers
80 views

Is there a CLI tool that would prettify a JSON string [closed]

On my host I enter the following, which returns a bunch of information which isn't particularly easy to read at the CLI. echo $ENV_VAR | base64 --decode Is there a way to format it? This is a ...
1
vote
2answers
628 views

How to set Ruby GEM_HOME and GEM_PATH

I'm a NOVICE user of Linux and using Linux mint 17.1 I've reinstalled Linux mint 20 time in last 3 days for that issue but could not fix it I'm trying to install ruby on rails using rvm what ...
0
votes
1answer
143 views

Possible to pass env vars into chpst without envdir?

I use runit to daemonize my web application, and I'm trying to see if I can have my process managed by sv not have to have a corresponding envdir for its environment variables. I wonder if I can just ...
2
votes
1answer
27 views

Unset all ENV variables matching _PROXY

I'm trying to unset all environment variables that match _PROXY: env | grep -i _proxy | column -t -s '=' | awk '{ print $1 }' | grep -iv 'no_proxy' | xargs -0 -I variable unset variable but it's ...
2
votes
1answer
78 views

How to safely transmit a password over SSH for a remote command to use

On the local server, I have a program that stores the password in the predefined environment variable (SPECIAL_PASSWORD). On the remote server I have a program that reads and uses a password from a ...
3
votes
1answer
115 views

what is the use of “export” command

I created a environment variable in one terminal window and tried to echo it in another terminal window. That displayed nothing. $TEST=hello After that I exported it and tried again to echo it in ...
1
vote
1answer
79 views

HOME is not set when exploiting a vulnerability

Can you help me solve this error? sh: line 61: cd: HOME not set. Distribution: Metasploitable 2 (Ubuntu 8.04) /root/.bashrc (comments and whitespace removed): [ -z "$PS1" ] && return ...
3
votes
3answers
121 views

How to set HOSTNAME in zsh?

In bash, which sets $HOSTNAME for you, I was able to calculate the total length of prompt line simply by using something like: PS1_length=$((${#USER}+${#HOSTNAME}+${#PWDNAME}+12+${#PS1_GIT})) It was ...
5
votes
2answers
2k views

What is $PWD? (vs current working directory)

So Wikipedia (link) tells me that the command pwd is short for "print working directory", and that makes sense. But for the environment variable, the "P" has to be an acronym for something else than ...
5
votes
2answers
2k views

What is the difference between 'env' and 'printenv'?

What is the difference between the two commands env and printenv? They both show the environment variables, and the output is exactly the same aside from _. Are there any historical reasons for there ...
1
vote
1answer
23 views

How to correctly set the XDG base dirs gobally and dynamically

I get a lot of config folders in my homefolder. I assume that is, because $XDG_CONFIG_HOME is not set and some software (e.g. fontconfig, umlet) does not follow the standards. $XDG_CONFIG_HOME ...
0
votes
0answers
17 views

Can I run a single program without running it through a window manager? (Gnome, Technic-Launcher)

I'm running into an issue with Technic-Launcher being completely white when run in gnome, but it's fine in other DE's. The developer says it's an issue with mutter and undecorated java windows. Can I ...
2
votes
2answers
474 views

How to source correct startup scripts on interactive, non-login shell

I'm trying to set up a sane/usable environment in a barebones OpenSolaris-derivative (OmniOS, a distribution of Illumos/OpenIndiana). I have all the plumbing code I need in .profile, .inputrc, and ...
2
votes
2answers
126 views

Zsh: export: not valid in this context

When running this script, I run into an error on this line (relevant snippet below): ... _NEW_PATH=$("$_THIS_DIR/conda" ..activate "$@") if (( $? == 0 )); then export PATH=$_NEW_PATH # If ...
15
votes
3answers
801 views

Issue an error when using empty shell variables

Sometimes I use, $PROJECT_HOME/* to delete all files in the project. When the environment variable, PROJECT_HOME is not set (because I did su and the new user doesn't have this environment variable ...
1
vote
0answers
27 views

If processes can't modify their parent's environment, what is MC doing?

As far as I know, a process cannot modify its parent's environment. However, when I run mc (GNU's Midnight Commander, a curses-based file manager) and then quit it, I end up with another $PWD: ...
47
votes
2answers
6k views

$VAR vs ${VAR} and to quote or not to quote

I can write VAR=$VAR1 VAR=${VAR1} VAR="$VAR1" VAR="${VAR1}" the end result to me all seems about the same. Why should I write one or the other? are any of these not portable/POSIX?
0
votes
1answer
72 views

Fixing a broken PYTHONPATH environment variable

I recently installed some software, which required python to operate. For some reason, it installed its own version of python, and modified the PYTHONPATH variable. Now, when I attempt to import a ...
0
votes
0answers
70 views

$PATH variable on Fish Shell OS X

I have somehow screwed up my path variables with Fish shell on OS X. Is this the proper $PATH variable in the config.fish? user@host ~> more ~/.config/fish/config.fish set -g -x PATH ...
0
votes
0answers
30 views

Computer won't load if I comment out sourcing bashrc from .profile? [duplicate]

I am trying to understand the difference/application of system files like .profile/.bash_profile/.bashrc etc. Now, I understand that .profile will be sourced when I login to the computer routinely ...
5
votes
2answers
285 views

Can you execute a Bash function with the `at` command?

I want to execute a Bash function at a scheduled time. I think the right tool for this is the at command. However, it doesn't seem to be working. function stupid () { date } export -f stupid ...
3
votes
2answers
94 views

What is the difference if I start bash with “/bin/bash” or “/usr/bin/env bash”? [duplicate]

In shell scripts one specifies language interpreter on shebang(#!) line. As far as I know, it is recommended to use #!/usr/bin/env bash because env is always located in /usr/bin directory while ...