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

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Removing a directory from PATH

I'm trying to compile wxWidgets using MingW, and I have cygwin in my path, which seems to conflict. So I would like to remove /d/Programme/cygwin/bin from the PATH variable and I wonder if there is ...
0
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2answers
43 views

Percent signs and environment variable in a shell script

While troubleshooting an issue, I came across these entries given below in one of the shell scripts used by our application. This was written by someone who no longer works in the company and I am ...
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2answers
4k views

Who sets $USER and $USERNAME environment variables?

Also, will these variables always match currently logged-in username (they do on my Debian system)? Can I assume their availability in other Unix(-like) systems? I'm also curious why one would use ...
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1answer
53 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" ...
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2answers
39 views

where is LD_LIBRARY_PATH? how do I set the LD_LIBRARY_PATH env variable?

where is LD_LIBRARY_PATH? how do I set the LD_LIBRARY_PATH env variable?
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2answers
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“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 ...
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3answers
4k views

Set Variable Environment Variables in bash (or other)

I want my script to read a file containing key/value pairs of environment variables to set, and then to set them. So far, I have this: #!/bin/bash cat $1 | while read kv do key=${kv%=*} ...
1
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1answer
23 views

Run an X11 program under Cygwin

How do I set the appropriate DISPLAY environment variable? I try to launch idle in cygwin using the following command: idle ...and I get a display error: _tkinter.TclError: no display name and ...
2
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1answer
33 views

Preserve environment variables using systemd?

Do systemd unit files support preserving existing environment variables? (Something similar to sudo -E?) Not referring to Environment= or EnvironmentFile= here. It would be be useful if systemd ...
2
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4answers
56 views

Change prompt when starting a terminal from bash script (but don't affect all terminals)

I have two terminals installed, gnome-terminal and xfce4-terminal. I would like to have only the xfce terminal showing a simple > as prompt when I start it. The gnome-terminal prompt should remain ...
2
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4answers
5k views

Storing a list in a variable

I am trying to store the name of list of files that contain 781 in their name. I will be using this list to perform some operations and after that I will delete this list. I have two options to do ...
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0answers
11 views

Loading linux environment variables [duplicate]

I have a set of environment variables and i would like to load it automatically on each startup. As of now i am doing the following: In /etc/environment export FLEETCTL_TUNNEL=10.77.189.179 In ...
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3answers
56 views

How Long do the Contents of the .bash_history File Last?

How can I modify the contents of my bash_history file? What values or variables control how long the history lasts? Are there any other things I can change to provide finer control of my BASH ...
1
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1answer
24 views

several virtual profiles for the same user

Many times there are several "identities" which one user uses: for work, open-source, academia etc., all require different ssh keys, editor configurations, git configs etc. I was wondering if there ...
2
votes
2answers
202 views

Meaning of \ before environment variable

In ksh on an old Solaris box I used: export PS1="$PWD $" to set the prompt to the current directory. It works great until you cd elsewhere, then you see that it's not evaluating PWD each time. I ...
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2answers
53 views

how to use http proxy in terminal

I have to use a http proxy to access Internet. Now I'm using firefox with the http proxy to access Internet. But on terminal, I can' access Internet. So are there ways to use http proxy on terminal ...
6
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2answers
3k views

rkhunter warns me about root.rules

I run : :~$ sudo rkhunter --checkall --report-warnings-only One of the warnings I've got : Warning: Suspicious file types found in /dev: /dev/.udev/rules.d/root.rules: ASCII text and ...
1
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1answer
99 views

Why is variable assignment preceding command ignored? [duplicate]

The bash 4.1 manpage states (emphasis added)... Simple Commands A simple command is a sequence of optional variable assignments followed by blank-separated words and redirections, and ...
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3answers
23k views

How do I set an environment variable on the command line and have it appear in commands?

If I run export TEST=foo echo $TEST It outputs foo. If I run TEST=foo echo $TEST It does not. How can I get this functionality without using export or a script?
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4answers
66 views

How to run a script as if it's running at boot?

I have a script running at boot time, however it's giving me errors I see in the log file. When I run it manually, it runs fine - probably the environment is changed. Is there a way to run such a ...
9
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2answers
35k views

How to permanently set environmental variables

My variables are LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib ORACLE_HOME=/usr/lib/oracle/11.2/client64 How to save these variables permanently ?
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0answers
56 views

export -f in .bashrc after upgrade to bash 4.3.30 kills builtins?

I recently upgraded my bash (Mac OS X 10.6.8) from 3.2.48(1) to 4.3.30(1) via macports, and while the install seems to have gone smoothly, the two spots in my ~/.bashrc where I had export -f myfunc; ...
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3answers
2k views

How can I keep *all* environment vars for a specific command in sudo?

I have a script that sets several environment variables and then finally calls another script using sudo. The script run with sudo must be able to pick up those variables, and I'm not always going to ...
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3answers
11k views

What is the difference between ~/.profile, ~/.bashrc, ~/.bash_profile, ~/.gnomerc, /etc/bash_bashrc, /etc/screenrc …?

Answers to the questions on SO and askubuntu, along with poking through (and reading headers of) $HOME and /etc/, indicate a number of files that can be used to set environment variables, including: ...
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8answers
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How can I run a cron command with existing environmental variables?

How can I run a cron command with existing environmental variables? If I am at a shell prompt I can type echo $ORACLE_HOME and get a path. This is one of my environmental variables that gets set in ...
2
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1answer
161 views

How to pass environment variables to a non-interactive shell (with example)?

In a sh script another sh script is started with su -l <user> -c /path/to/script.sh. As far as I understood script.sh will be run in a non-interactive shell. The official documentation tries to ...
7
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1answer
211 views

Why does bash even parse/run stuff put in the environment variable?

The shellshock bug in bash works by way of environment variables. Honestly I was suprised by the fact that there is such a feature like: "passing on of function definitions via env vars" Therefore ...
8
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2answers
159 views

Why is the ability to definine functions in an enviromental variable not a security risk in itself?

As I understand it, generally it is considered safe to let anyone provide information that will be stored in an environmental variable. The shellshock vulnerability is an issue here because it means ...
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0answers
22 views

Can't set PATH with a script [duplicate]

I have written a script which was supposed to add some value to environmental variable PATH, but script doesn't do that if I start it with ./script.sh. #! /bin/bash INSTALLDIR="/opt/ARM" ...
2
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1answer
75 views

Export multiple options in $GREP_OPTIONS

I use ZSH with "OH MY ZSH". In "OH MY ZSH" variable $GREP_OPTIONS exports with multiple value: $ echo $GREP_OPTIONS --color=auto --exclude-dir=.cvs --exclude-dir=.git --exclude-dir=.hg ...
1
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1answer
40 views

How to set `screen` environment variable from bash?

Background I use virtualenv to switch between environments "1.0" and "2.0". I use screen to manage terminals. When I work on one environment I want all new screen windows to start with this ...
2
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2answers
105 views

Using gdb to inspect environment variables

I have been trying to find the address of the SHELL environment variable in a program on a Ubuntu 12.04 machine. I have turned off ASLR. I found similar posts : SO question and blog post I have ...
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0answers
93 views

Runtime parameters for a systemd service

I am a little confused about how runtime parameters are normally supplied to a systemd service. The general idea I have is that the following happens: There is a file that contains the environment ...
7
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1answer
337 views

Echo difference between Ubuntu and Red Hat [closed]

I have mostly been experimenting with Ubuntu but recently was using a Red Hat Enterprise system and was surprised at a difference I found setting and displaying environment variables. In Ubuntu I ...
0
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1answer
78 views

Trying to access environment variable (array) declared in ~/.profile from shell script

I'm currently fighting with this problem. I've already read some older posts here on SE, and got the conclusion that the only sane way to put a variable (even an array) is ~/.profile. So OK, array ...
3
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0answers
208 views

Locale environment variable settings do not take effect

I have a Debian 6 (64-bit) VPS where I cannot seem to get the locale environment variables LANG and LC_* set. (Everything below as root). vps:~# locale -a C POSIX en_US.utf8 nl_NL.utf8 vps:~# locale ...
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0answers
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Setting XDG_DATA_HOME and XDG_CONFIG_HOME on compile/per program

The goal is to have a -dev version and a stable repository-based version installed at the same time, but with different data and config directories so that the dev version is not operating on(and ...
1
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1answer
292 views

Where can I set global Java Options?

I have horrible, improperly-rendered fonts in Java programs such as jabref and rubymine. This can be fixed by running _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=on' jabref I understand that I ...
9
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1answer
216 views

Why does the location of Enviroment Variables vary that much?

Reading the book Hacking: The Art of Exploitation by Jon Erickson, I am trying to approximate the address of an environment variable SHELLCODE to exploit a program. Every time I run ...
2
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1answer
231 views

Which file defines the LESSOPEN environment variable?

please advise me about the following. On my Linux machine - I do the following: $ env | grep -i LESSOPEN LESSOPEN=|/usr/bin/lesspipe.sh %s So from env command I see that: ...
1
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1answer
78 views

Choice of editor when running under sudo

On an Ubuntu 12.04 machine I've used the alternatives system to set the editor to vim.basic. I get the correct editor when root but not when I sudo to root and run crontab, and I'm trying to ...
2
votes
2answers
232 views

How to find where is $JAVA_HOME set? [duplicate]

I'm a beginner with linux. I'm trying to change the value of $JAVA_HOME & I just can't seem to find in which file is it being set currently. I can't remember where did I set it the last time. ...
24
votes
6answers
1k views

How to determine where an environment variable came from

I have a linux instance that I set up some time ago. When I fire it up and log in as root there are some environment variables that I set up but I can't remember or find where they came from. I've ...
44
votes
3answers
22k views

What does “LC_ALL=C” do?

What does the C value for LC_ALL do in Unix-like systems? I know that it forces the same locale for all aspects but what does C do?
9
votes
2answers
4k views

What is the significance of single and double quotes in environment variables?

I defined some environment variables in my .profile like this: MY_HOME="/home/my_user" but the variable does not seem to evaluate unless I strip off the quotes and re-source the file. I believe ...
1
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1answer
40 views

Global variable for every script

I want to declare a variable in such way that every script can access and alter its value. I have written a script that set the value of a variable called flag on exit and I am using a crontab entry ...
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4answers
171 views

why do we not need export here?

$ IFS=";" $ read first second i am;a_i b c $ echo $first i am $ echo $second a_i b c $ echo $IFS Am I right that read first second is a subprocess of the current shell process? If yes, why don't ...
6
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2answers
158 views

Are environment variables visible to unprivileged users on Linux?

I'm trying to determine if, in Linux, environment variables for a process are observable by other (non-root) users. The immediate use case is putting secrets into environment variables. This is ...
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2answers
65 views

profile.d on headless server

Is it a bad idea to put variables needed by a daemon program running at boot on a headless system in /etc/profile.d/? From my understanding profile.d doesn't get executed until someone logs into the ...
0
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1answer
82 views

How set glib environment variable: g_slice

I've been told I need to set the following environment variable in order to work around a glib bug: G_SLICE=always-malloc But I don't know how to do it, and anywhere I've seen it's use recommended, ...