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

learn more… | top users | synonyms

1
vote
1answer
21 views

Setting environment vars containing space with env

I'm trying to use env to set environment variables (read from another source, say for example a file) for a subprocess. Essentially, I am attempting the following: env VALUE=thisisatest ...
2
votes
5answers
6k views

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 ...
3
votes
3answers
158 views

Environment variables. Where are they saved in? [duplicate]

If I do not edit the .bashrc or other config files, the environment variables that I've setted are gone when I logout, or turn off the terminal. What I'm curious is, where are those 'temporary' env ...
2
votes
1answer
229 views

Storing longer text output in memory in shell variables vs Writing to disk

I have the below call to db2 database command line tool inside a loop, which runs 100k iterations. (the output from db2 is 5 rows of 20 chars approx per each call, total of approx 100k calls. The ...
0
votes
0answers
19 views

Why does not changing changing LC_ALL from utf to C speed up my grep?

I wanted to try to speed up my already fast grep. I read that changing lc_all from utf to c was supposed to do this. However, it gives no speedup. What might the reasons be? How do I "debug" this? ...
-2
votes
1answer
16k 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?
11
votes
2answers
746 views

What is DISPLAY=:0?

What is DISPLAY=:0 and what does it mean? It isn't a command, is it? (gnome-panel is a command.) DISPLAY=:0 gnome-panel
67
votes
3answers
35k 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?
3
votes
1answer
35 views

Question on environmental variable

I have Oracle jdk7 installed on my centos6. I noticed that the /etc/profile has the lines below: #below lines are added for Java export JAVA_HOME="/usr/java/latest" ## export JAVA_HOME JDK ## export ...
3
votes
2answers
5k views

Exporting a variable with dot (.) in it

How to export a variable which has dot in it. I get 'invalid variable name' when I tried : export my.home=/tmp/someDir -ksh: my.home=/tmp/someDir: invalid variable name Even escaping metacharacter ...
0
votes
2answers
49 views

What is the variable of $#?

I'm learning introductory Linux and came across something which I did not understand: "The following command has been executed: set 10 20 30 40 50 Enter the value of the variable $#: I understand ...
23
votes
6answers
9k views

How to print only defined variables (shell and/or environment variables) in bash

The bash builtin command set, if invoked without arguments, will print all shell and environment variables, but also all defined functions. This makes the output unusable for humans and difficult to ...
0
votes
1answer
17 views

Linux environment variable using non-fullpath

I'm setting the environment variable LD_PRELOAD to a shared library file I created, in order to let LD_PRELOAD to point to my created shared library file, I need to give the full path like this: ...
15
votes
3answers
12k views

How to make unix service see environment variables?

I have set my environment variable using /etc/profile: export VAR=/home/userhome Then if I do echo $VAR it shows /home/userhome But when I put reference to this variable into the ...
1
vote
1answer
25 views

Loading .profile from .bash_profile or not using bash_profile at all? [duplicate]

I am on a MAC running Yosemite. Until recently, I only had a .profile, in which I added directories to my PATH. Now I have a .bash_profile, which from what I experienced and later read online, ...
1
vote
4answers
118 views

bash division of numbers in text file

I have two numbers in test.txt file, I would like a way to divide the second number by the first number and assign the result to a variable or file in a bash script that I can use. I have used awk ...
2
votes
0answers
32 views

Is there a nice way to set directory/project local environment variables?

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 ...
1
vote
1answer
48 views

Optimal way to set and read variables

I need to set 6 variables which are used by several services and applications in Linux. I have so far been using the environment variables, but find it very complicating to modify these variables ...
0
votes
1answer
31 views

Exporting a piped command without evaluating output?

I'm trying to set an export that would effectively kill a process based on the PID that pgrep feeds it. Running the command kill $(pgrep myAppName) appears to work (if 'myAppName' were the name of an ...
0
votes
0answers
45 views

How do I get Ubuntu to use Anaconda's python instead of the standard /usr/lib/python…?

I installed Anaconda using instructions provided on the main website, which are similar to those that can be seen here: http://askubuntu.com/questions/505919/installing-anaconda-python-on-ubuntu ...
0
votes
2answers
35 views

Why doesn't `sudo su -l -c “java”` work even though `sudo su -l -c “echo $PATH”` displays the location of the java binary? [duplicate]

I have a server with Java binaries from a tarball on a custom location, and the following in /etc/bash.bashrc: export JAVA_HOME=/path/to/java/home export PATH=$JAVA_HOME/bin:$PATH When I run sudo ...
0
votes
1answer
22 views

Why doesn't commons-daemon ./configure recognize $JAVA_HOME? [closed]

I'm trying to install a tomcat 7 server. I'm following these instructions from the tomcat 7 docs. I also set my JAVA_HOME variable in ~/bashrc as well as ~/.bash_profile and /etc/profile. I can do ...
2
votes
2answers
45 views

Is shell parent of all the processes in linux

I have been trying to understand shell scopes and environment in depth. I have been reading about how if we do export VARIABLE=VALUE it will be available in subshell. So I wanted to ask a question I ...
1
vote
1answer
69 views

Environment Variables not getting set in bash_profile

I have my bash_profile environment setting as follows: if [ `hostname` = "devoraebs01" ]; then echo `hostname -f` . /appl_top/deverp/appl/APPSDEVERP_devoraebs01.env When I log into this host, ...
1
vote
2answers
26 views

tcsh: make 2-digit hours in prompt

I am attempting to simply get a standard lexigraphical time display in the prompt and the history file in the range of 00:00:00 to 23:59:59. I've tried set prompt=%P$ but this just produces, for ...
5
votes
2answers
4k views

dot file not sourced when running a command via ssh

When I run my program interactively, it works fine: ssh somehost $ ~/some/path/somescript.py When I run my program over ssh directly, it doesn't work. The variable PYTHONPATH is not set, because ...
2
votes
1answer
31 views

Running a constructed command from bash script

I constructed a command like this in a bash script a="my_cmd"; a="$a --verbose"; echo $a; $a; It works and executes my command correctly. But when I add an environment variable to the mix it ...
1
vote
1answer
39 views

When did bash quit exporting SHELL?

I upgraded a Debian box from stable to Jessie and I noticed that SHELL is no longer exported, so screen and similar programs start dash for subshells instead of bash. When was this change made and ...
1
vote
1answer
52 views

su or sudo keeping/removing certain environment variables

I would like to be able to log in as another user and keep most, but not all of my environment. Specifically, I would like to set $HOME to the correct value for the new user, but keep probably ...
1
vote
2answers
28 views

Does X mangle prompt environment variables?

I'm starting it with startx. Before that I have PS1 in my environment: $ cat /proc/self/environ | tr '\0' '\n' | egrep '^PS' PS1=[\u@\H \w] PS3=> PS2=> PS4=+ From inside X I get: $ cat ...
1
vote
1answer
31 views

How can I consistently set an environment variable for a single program?

I'm using LC_TIME="en_AU.UTF-8" in general, and I'm happy with that. However, when I use Thunderbird, I'd like it to use a 12-hour clock. I've created a custom locale, and it works fine if I launch ...
0
votes
0answers
59 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
3answers
54 views

Controlling the environ passed to child process by bash

I am using x86_64 GNU/Linux with bash #include <stdio.h> #include <stdlib.h> int main(int argc, char **argv) { system("set > setc"); // A subset of `$ ...
1
vote
0answers
38 views

What does CRON=1 do?

What does setting CRON=1 do when set in front of a command? CRON=1 ./foobar.sh I suspect that the cron environment variable does something for printing to standard out. But I can't find anything ...
20
votes
1answer
5k views

Difference between environment variables and exported environment variables in bash

Bash seems to differentiate between variables which have been exported and those which have not. example: $ FOO=BAR $ env | grep FOO $ set | grep FOO FOO=BAR set sees the variable but env does ...
2
votes
2answers
257 views

Setting the TOPCOLORS environment variable

I don't seem to be able to find any examples on the Internet for this environment variable, which top will apparently read and use to display colours. How would I set this variable correctly so top ...
2
votes
0answers
18 views

Configure where GRUB2 environment block is located

I have Arch, Ubuntu, and GRUB2 installed on a BTRFS filesystem. I'm aware that GRUB cannot write to BTRFS for a variety of good reasons, and therefore cannot save environment variables to ...
1
vote
3answers
320 views

gmrun stopped searching user added path

gmrun started ignoring the PATH variable I defined in ~/.bashrc for no obvious reason. Anyone has any idea how I can find out a way to solve this annoying problem? EDIT I have not found the ...
177
votes
6answers
304k views

How to correctly add a path to PATH?

I'm wondering where a new path has to be added to PATH environment variable. I know this is accomplished editing .bash_rc (for example), but it's not clear how to do this. This way: export ...
1
vote
0answers
32 views

How to set environment variable for BACI compiler and interpreter?

I have installed executable files for BACI compiler and interpreter in my Ubuntu system. But now every time I have to compile my .cm file I have to go to the program folder and run ./bacc and ...
0
votes
0answers
48 views

Set Environment Variable for Ranger File Manager

I've recently stumbled across ranger file manager and immediately took a liking to it. However, there is still a problem I couldn't figure out the solution to: How is it possible to change environment ...
2
votes
2answers
60 views

The 'LANGUAGE' locale variable - how to set English as primary language? A bug in gettext?

The "LANGUAGE" variable is supposed to set the default language and can be used to specify a set of languages, where the next language will be used if a message is not available in the first ...
1
vote
1answer
33 views

$USER not set ssh

On some of my debian wheezy servers there is a global variable $USER that contains the current logged in username and on some this variable is not set immediately at login. How do I set $USER so it ...
1
vote
2answers
56 views

Do programs source .bashrc when run?

I append to my PATH environment variable in my .bashrc file (Ubuntu v12). I also have a service (Atlassian Bamboo) that relies on the modifications to PATH. When I restart the service (which runs as ...
0
votes
1answer
70 views

make custom commands on android 4.4.2

I want to program and debug in my android phone. To do that I downloaded c4droid and it's gcc plugin. after a lot of tries I understood that gcc is in directory ...
1
vote
1answer
241 views

systemd: default value for environment variable

I would like to migrate some OpenRC init script to systemd but I think that it is general problem of environment variables handling in systemd. Original OpenRC files There is a file e.g. ...
5
votes
2answers
60 views

Introduction of env --null

I have tried to extract environment variables in a Python process with help of env --null, which works even for environment variables containing newline character. But on some machines I have ...
3
votes
2answers
81 views

Unsetting environment variable with an empty name

For some reason, my system sets an environment variable with no name. This can be seen in the output from printenv as a line containing only = and causes problems for Python (more specifically the ...
0
votes
1answer
40 views

How does sudo -E work here?

I executed the following command to add a ppa repository in Ubuntu: sudo add-apt-repository ppa:ppaname/ppa This command returned an error that the ppa name format is not correct. Then I looked here ...
1
vote
2answers
120 views

Makefile make install not executing multiple line commands

I have a Makefile that contains an install section to allow me to make install after building the source code. The install section contains two lines of shell commands: install: /usr/local/lib cp ...