Questions tagged [environment-variables]
For questions pertaining to environment variables, a set of dynamic variables that can affect the running processes behavior and access to resources. Use this tag for questions about environment variables or questions about issues arising from the impact of setting or modifying the variables value in running processes behavior and access to resources.
1,512
questions
-1
votes
2
answers
37
views
How to prepend a prefix to variables sourced from a config/env file
I have this situation:
source local.env
run_my_app
In local.env, I have a bunch of environment variabless that pertain specifically to run_my_app, like this:
es_protocol="http"
es_host=0.0....
- 9,718
0
votes
0
answers
10
views
Set proxy on login if proxy server is reachable
I have to move between work, where we have a firewall and have to connect to the internet through a proxy and home where I do not need a proxy.
Since there are no global proxy settings in Linux and a ...
- 101
-6
votes
1
answer
92
views
What is the `COLOR` environment variable? [closed]
What is the history behind $COLOR, why is no one using it, is it safe to use, and what should it be used for.
Why is it COLOR="1" on my "Windows Subsystem for Linux v2 Debian VM"? ...
- 379
0
votes
1
answer
34
views
Set PATH for /bin/sh in Debian:11 image
Background
I am building an image based on Debian:11. I am trying to set the PATH for the /bin/sh with a dynamic value determined at image build-time. (The "at image build time" is important....
- 103
4
votes
3
answers
463
views
Safely save and restore environment variables
I have a script that parses a rudimentary .env file and exports its contents as environment variables, before taking further action:
set -eu
test -f .env && load_dotenv
exec ./foobar x y z &...
- 1,278
0
votes
0
answers
37
views
How to set dotenv variables in bash shell when changing directory? [duplicate]
I'm trying to set custom environment variables when changing to a particular directory that has a .env file containing the variables. In order for it to be triggered automatically, I included the ...
- 1
0
votes
0
answers
41
views
How do you pass an array through systemd EnvironmentFile?
[root@vm-devcjn-01-a tmp]# cat /tmp/test_service_script_fred
#!/bin/bash
sleep 30&
echo `date` $# args: $@ > $0.log
When called from the shell, passing an array, works as expected:
[root@vm-...
- 1
1
vote
0
answers
76
views
Use env var in the path section of LoadCredential of systemd unit file
I am creating a service that I want to run under Ubuntu using systemd. For this service I need to load a credential using the LoadCredential= option of systemd. This works with the following unit file ...
0
votes
1
answer
132
views
Add remote server path to environment variable
A very (I thought) simple question, but cannot find an answer:
In Bash:
Is it possible to add the path to a remote server to an environment variable?
Use case:
We are setting up a local pip repo and ...
- 205
1
vote
1
answer
188
views
How to export global variables to child process in bash
I am using Arch and bash and Openbox window manager.
Everything is up to date.
Openbox is configured with a file called rc.xml
Within rc.xml I typically call bash -c 'command1; command2; etc'
to ...
- 819
1
vote
1
answer
150
views
some_variable vs some-variable in zsh
Why is it that zsh seems to understand what to do with some_variable=1 command, but not some-variable=1 command? E.g.: $ fs_screen=1 mpv --fs-screen=${fs_screen} someFile.mp4 works fine but $ fs-...
- 1,954
0
votes
2
answers
65
views
how to make a subshell a "program"
I want to ignore all pre-existing env variables, and echo just one, like this:
env -i <(
export foo=bar;
env
)
and this would just print:
foo=bar
however, the construct of
env -i <()
...
- 9,718
0
votes
1
answer
74
views
diffing two .env files
I have two env files, let's say x.env and y.env, the order of the variables is different, but the content could be the same but likely different.
Is there some tool I could use to diff the variables?
...
- 9,718
0
votes
0
answers
49
views
Environment variable explicitly set on /etc/profile is lost on Arch
This was my /etc/profile before I modified it.
$ cat /etc/profile
# /etc/profile
# Append "$1" to $PATH when not already in.
# This function API is accessible to scripts in /etc/profile.d
...
- 1
0
votes
1
answer
80
views
Why am I missing $XDG_RUNTIME_DIR and $DBUS_SESSION_BUS_ADDRESS after logging in via SSH and trying to set up user scope service
I'm trying to set up a user scope service after logging in via SSH, but when I try setting anything up like..
systemctl --user enable wallpaper.timer
I get these errors, even though I'm logged in via ...
- 537
0
votes
1
answer
281
views
Why the docker-compose.yml environment overrides the .env file content?
I have a docker container that is set up using docker-compose.yml and I introduce a couple of environment variables in it:
environment:
- AUTH_SECRET=some_secret
Then I have these ...
- 639
0
votes
0
answers
69
views
Environment variables are not getting loaded when script is executed on a remote server via SSH (RHEL 8)
I have a vendor script (startup.sh) to start application services on a Linux box. Script when called manually by logging into the server (as sudo su - userID) initiates all the environment variables. ...
- 15
1
vote
0
answers
60
views
How can daemons source environment variables on a machine without persistent storage
I'm working on a Yocto Project build of an AARCH64 system, where I need the monit daemon (or at least a process started by monit) to access an environment variable I'm setting.
It's my understanding ...
- 11
0
votes
0
answers
52
views
Use environment variables in terminator config
I want to launch terminator with multiple terminals with some starting on a different directory. The directories could change based on the $USER on different systems but I have them defined in .bashrc ...
- 13
0
votes
0
answers
44
views
Bash script or the like to erase env values that host secrets once used to initialized app in a kubernetes container
I have a flask app that runs in a kube cluster. It does all the right things by using kube secrets to set the env values required to initialize the application. There are some env values I suspect ...
- 101
0
votes
0
answers
38
views
Automating proxy configuration across multiple applications without plaintext password
More generally than the post described here: Using bash functionality in rc files
I would like to set an appropriate proxy configuration for all/multiple applications including but not limited to: ...
- 107
3
votes
1
answer
149
views
`sudo --preserve-env=MY_VAR` vs `sudo env MY_VAR=$MY_VAR`
I read in man sudo the following:
--preserve-env
Indicates to the security policy that the user wishes to preserve their existing environment variables. The security policy may return an error if the ...
- 701
0
votes
1
answer
34
views
What are the differences in the way to get the value of a single environment variable? [duplicate]
I know the typical way is echo "$PATH", for example. But echo $PATH also works. Also, you don't need the echo command even, you can just type $PATH, and the value of path will be outputted ...
- 11
0
votes
1
answer
74
views
Is it a good idea to put "export BASH_ENV=~/.bashrc" in my .bashrc?
Let's say my Bash has some extensive ~/.bashrc customization that aids me not only in interactive use, but also in scripting (aliases, functions, variables, etc.). I would like to have this available ...
- 214
0
votes
2
answers
106
views
Pass a variable that contains a comma as a -v option to qsub
After seeing the reactions on Stack Overflow on this question and an unfamiliarity with qsub, I believe thqt U&L is better suited for this question.
In qsub, we can pass environment variables (a ...
- 183
0
votes
1
answer
126
views
Why RStudio is not picking up environment variables defined in $HOME/.bashrc
I use Arch Linux.
I use SSDM as display manager, but I have disabled it with:
sudo systemctl disable sddm
I have put code in /etc/profile, $HOME/.bash_profile and $HOME/.bashrc to echo when those ...
- 303
0
votes
0
answers
64
views
Reading Environment variable in ebpf
I am trying to create an ebpf program in C and want to read user set environment variables. Something similar to getenv in C.
I am unable to find a bpf_helper() function that does this job.
Does there ...
- 1
3
votes
2
answers
338
views
How to unset bash variable `!::=::\`? [duplicate]
When I run printenv one of the returned variables is !::=::\. I noticed that the variable exists because docker does not work correctly with it set.
$ printenv | grep ::
!::=::\
$ docker stack deploy ...
- 133
-3
votes
1
answer
48
views
Bash variable ${DIRSTACK[@]} for zsh [closed]
What the Zsh equivalent of Bash's ${DIRSTACK[@]} variable?
user572894
0
votes
1
answer
212
views
What are these bash functions on Alma Linux 8 viewable in the environment with `env`?
When I run in env in Alma Linux 8, I get the following
BASH_FUNC_which%%=() { ( alias;
eval ${which_declare} ) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot $@
}
...
- 29.6k
2
votes
1
answer
233
views
Systemd unit file - set environment variable value based on conditional?
I was wondering if it's possible to set an environment variables value based off of a conditional inside the systemd unit file, specifically a service file.
Ex:
Environment=if (condition) { SOME_VAR=1}...
- 21
1
vote
1
answer
410
views
How to pass environment variables when executing command as another user?
As root I did
# WWWFOLDER=myproject
# echo $WWWFOLDER
myproject
# su - anothershelluser /bin/bash -c "echo $WWWFOLDER"
#
As you can see, I got nothing printed.
I already tried, without ...
- 849
0
votes
1
answer
287
views
execute script from another script not working [closed]
I am using shell scripts to compile the different components. I have one main script which is calling another shell script.
Here is an example,
Repo/build.sh
Repo/code/mode/1/build/build_1.sh
Now if ...
- 3
0
votes
1
answer
210
views
How time zone variable for Kubernetes should look like?
I am European
export BOOTSTRAP_TIMEZONE="UTC +2"
I can not check, something is wrong with Github right now.
If that is not right what should I change?
- 311
0
votes
0
answers
152
views
How to change default DISPLAY environment variable in RHEL8
I'm in a weird spot in which I'm trying to run an independent vnc server on display localhost:1, but given that I am running Gnome, that display is already being used by the desktop itself.
I do not ...
- 1
0
votes
0
answers
350
views
Use shell command to set env variable in Dockerfile
I am trying ot set up a custom redis alpine image and I would like to set the private IP that get assigned to the instance as an environment variable. In order to do so, I am using the following ...
0
votes
1
answer
65
views
How might I source a Bash script from another interactive Bash script?
I have a interactive Bash script, conozcoArrays.sh,
#!/usr/bin/bash
echo -e "\nGive me their phone number?\n"
read number
TOGOes=("$(find ~/chicas -maxdepth 1 -iname "*$number*&...
- 621
1
vote
3
answers
111
views
export command behaviour in bash vs bourne shell
bash v3.2 (though I think holds for newer versions too):
In section 3.7.4 Environment, the docs say:
On invocation, the shell
scans its own environment and creates a parameter for each name found, ...
- 13
3
votes
1
answer
318
views
systemd $HOME environment variable different from expected
I have a service that runs as root:
[Unit]
Description=my service
After=docker.service network-online.target
Requires=docker.service network-online.target
[Service]
TimeoutStartSec=0
RestartSec=60
...
- 171
0
votes
1
answer
111
views
How to keep all environmental variables during sudo?
I am trying to use sudo -u postgres to run all postgresql commands inside a container and I'd like to inherit all environment variables before the sudo.
I need to sudo in the first place because some ...
- 618
0
votes
2
answers
228
views
Variable content lost after while-done loop in a script finishes [duplicate]
I like to make global variables for all my host names.
The must get an variable name ip_ = ipadress
I got it working partially...
The variable is lost out of the while done loop
#!/bin/bash
#file x.x
...
- 5
-3
votes
2
answers
351
views
Bash Script - Expand ESCAPED dollar-sign ($) into its Variable
My Problem
I have this run.sh script:
#!/bin/bash
TODAY=$(date)
FILE="my_file.txt.\${TODAY}"
When I echo FILE I get this:
echo ${FILE}
Output: `my_file.txt.${TODAY}`
But I want this:
...
- 661
-2
votes
1
answer
48
views
Bash and Environment Variables
I have a number of bash scripts that use the following variables. Would it make sense to include them an Environment Variables? If so, how can I declare them properly?
wht="$( tput bold; tput ...
- 1,183
0
votes
0
answers
155
views
Script for awscli check not working with crontab schedule
I have written a small code snippet to check the aws cli version
#!/usr/bin/env bash
if [ -e "/usr/local/bin/aws" ];
then
myAWS="/usr/local/bin/aws"
else
...
- 1
0
votes
2
answers
350
views
Command substitution not working with environment variable
I have this command which I want to variabilize. Particularly I want the latest argument presence to depend on an environment variable.
ansible-playbook --inventory inventories/ssg-dev deploy.yml --...
- 103
1
vote
0
answers
225
views
Docker does not trigger login or invoke /etc/profiles?
Trying to deal with the problem of
dircolors: no SHELL environment variable, and no shell type option given
when I start my docker container.
So from
What sets the $SHELL environment variable? it can ...
- 1,344
0
votes
5
answers
438
views
How to start ssh-agent without eval
What I already know
To start ssh-agent you need to use the command eval $(ssh-agent)
You have to do this because of security reasons. A child process can't change environment variables of the process ...
- 661
0
votes
1
answer
96
views
Conventions for the PATH variable's value
I am looking for best practices, or at least conventions, for the PATH variable's value.
In particular, I would like to know
is there any preferred/recommended ordering for the /bin, /usr/bin, and /...
- 15k
0
votes
0
answers
29
views
Manage PATH and other environmental variable centrally in Unix/Linux?
In windows, we can make a window pop up in control panel to edit environmental variables. That includes PATH. Then at all places we can use programs in PATH.
However, in macOS, linux, etc, we add ...
- 111
-1
votes
3
answers
782
views
Understand PS1 environment variable
On Stackoverflow, I just saw a question concerning the PS1 environment variable, which is responsible for the Linux terminal prompt.
My prompt looks as follows:
username@PORT-usr:/dir
username is the ...
- 141