Software :: Environmental Variables In BASH Source Code

Mar 17, 2011

My question has to do with how environmental variables are passed from parent to child processes at the BASH SOURCE CODE level. I have a need to add an environmental variable that has the complete invocation line so that the child process can see it via ENVP.I have been studying the source for a quite a while and can't seem to find how to make the variable pass to the child. In EXECUTE_CMD.c I found a good place to set the variable: I made a routine similar to PUT_COMMAND_NAME_INTO_ENV called PUT_COMMAND_LINE_INTO_ENV which would add "?=THE FULL INVOCATION LINE" as an environmental variable but it doesn't make it to the child. (I've tried names other than '?' but they don't work either.

I'm thinking that there is either a LIST or a attribute associated with those environmental variables that should be passed to the child but I can't find it.

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General :: Bash Read All Environmental Variables Set By Other Shells?

Jul 23, 2010

For example, if I'm in csh, I can use `setenv VARNAME varVALUE` while I can use export in Bash. Given that the environmental variables are created, can BASH read env vars from csh and vice versa?

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Red Hat / Fedora :: Permanently Setting Environmental Variables?

Aug 6, 2010

I installed Java on a server and anytime I have to start or stop a service that requires the $JAVA_HOME variable I have to manually set it with the export command such as: Code: export JAVA_HOME=/usr/java-jdk1.6.0_21 How can I permanently set this variable?

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Ubuntu :: Run Environmental Variables On A 10.04 LTS Home Server

Dec 24, 2010

I have installed ubuntu10.04 LTS in VirtualBox in my home computer(i forgot to tell you i am very new to linux-though i am studying a lot, but....-maybe because of my age "45" i am going slow. LOL. I hope i dont have a heart attack before i finish what i am trying to do in the server). Back to my issue: What i want is to have in the server some enviromental variables running not only for the root user but for all the users,when the server is open and not having to type the following commands every single time i open the terminal. Here are the commands:

export JAVA_HOME=/opt/java
export PATH=$JAVA_HOME/bin:$PATH
export M2_HOME=/opt/maven/maven
export PATH=$M2_HOME/bin:$PATH


(where java, maven, tomcat are symbolic links for java jdk, maven and apache-tomcat 5.5.31). Please (LOL) save me from the heart attack, give me the chance to enjoy the holidays with my family!

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Ubuntu :: Reset Environmental Variables After Restart The System

Apr 15, 2010

I am new in Using Ubuntu, I need to set up environmental variables in Ubuntu, I do the following:

export JAVA_HOME=/path/to/Java

it work fine, but every time I restart the system I have to reset it again Is that the right way to it, or I do something wrong

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Programming :: Can Bash Commands Be Converted To Assembly Like C Source Code?

Nov 30, 2010

I have read where C is first converted to Assembly before its final compilation to binary. Is there a way to do this with Bash commands? I would like the understanding that Assembly allows to Bash somehow.

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Programming :: Kill Follow-on Code If Source Fails In Bash?

Dec 20, 2009

I have a Bash script that runs other bash scripts. If the parent code fails, is there any way for me to also kill the child code?That kills any multiple instances of a script if I run it more than once. Is there any way I can just modify this into something that prevents the child code from running/continuing from running if the parent stops from an error?

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Ubuntu :: Bash Script With Variables And Editing Variables

Apr 6, 2011

mkvmerge -o <filename without extension>_TV.mkv -S <filename> && mkvextract tracks <filename> 3:<filename without extension>.*** && perl /home/brian/Desktop/ <filename without extension>.*** && rm <filename without extension>.***

Doing these commands for multiple command line file inputs is the goal. So I can just type ./ *.mkv in my terminal.This is what I have so far, but it doesn't work whatsoever.

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General :: Environmental Variable In Bash Command String?

Feb 9, 2011

I do this:


a@b:~$ export A=hi
a@b:~$ echo $A
a@b:~$ bash -c "export A=blah; echo $A"

Why doesn't the bash command print the new value of $A? Is there a way to make it do so?

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Ubuntu :: Source Code Of The Krnel From The - Source Trees Organization

Apr 11, 2011

i am already a little bit familiar with linux and now i want to know better the linux OS. i have downloaded the source code of the krnel from the and i dont understand the linux source trees organization, so can somebody do me a favor and give me a link to some internet page (or at least a book) that explains that?? i have searched in the internet with the tag:::linux source trees organization and i have not found nothing interesting

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Ubuntu :: How To See Source Code Of Open Source Software

Sep 12, 2010

I want to see the source code of smplayer software.from where i can see source code of open source softwares?

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General :: Referring To Variables In Bash?

Sep 13, 2010

Is there a difference when variables are referred to as $variableName and ${variableName} in bash?

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General :: Join 2 Variables In A Bash Script?

Aug 12, 2011

I have $db and $DATE set in my bash script, then I need to join them like this: mysqldump --user=usr --password=pss --databases $db | gzip > /backups/sqlNew/$db_$DATE.sql.gz;

Unfortunately, that doesn't work. How do I properly join those 2 variables into a filename?

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Ubuntu :: BASH Script Not Recognizing Variables

Jul 25, 2011

I'm trying to write a bash script, and for some reason Bash doesn't seem to like any of my variables _except_ the one used in a loop.What's going on? The same problem with MYS occurs regardless of its name, whether it is declared or referenced before, after, or inside the loop, and whether it is a string, integer, or floating-point number. Also, as far as I can tell, everything related to Bash is up to date.

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Ubuntu :: Variables In Bash Alises Not Working With 11.04

Jul 26, 2011

I am trying to use the following bash alias:

I've been able to get this working under mac and solaris.

I've also tried not escaping the vars.

Anyone know if this is doable with ubuntu's bash shell? (or any meaningful workaround other than writing a script for this?)

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Programming :: Using Grep / Variables In Bash Script

May 10, 2010

I'm trying to write a bash script and I'm having trouble with it.I have a list of DNS entires from a file called zoneExport.txt.Than I want to parse a log file to see if that DNS entry has been queried for. So I'm running a grep command and trying to save it into a variable. What I'm looking for is a variable ($varGrepQ) that has the number of matches for the grep query. I will then run this through an if statement and do some things from there..

But my problem right now is with this grep query. It keeps outputting '0' even when I know there are records in that file and when I run the same query on the command line I get the actual count. My thought is that the $record variable is not passing right.

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Programming :: Counting Variables In Bash Script

Nov 13, 2010

If I read in variables entered by the user, how can I check to make sure the correct number of variables were entered? For example, after reading in a data file and making it into an array, I have:echo "To check the data, enter the first element number, last element number and step size as x y z:"read x y z.It then goes on to start a loop, but what I would like now (before the loop) is a check to see if three variables have been entered, before the rest of the script continues.

I've tried specifying the variables as $1, $2 and $3, but if I echo $#, the value comes out as zero, so it's obviously not working.

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General :: Declare Global Variables In Bash?

Jan 23, 2010

I have a problem with a very big script I wrote in bash, and now I need to modulirize it in at least four smaller scripts. The problem is, that most of the variables I have will need to be shared by all scripts.

My question is: is there a way to declare global variables in bash? So that I can use and change them in any of the scripts and every change in the variable can be "seen" by the other scripts later.

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General :: Dynamic Variables And Heredocuments In Bash?

Apr 4, 2011

I've created a script that put in dynamic variables the value HELLO 1, HELLO 2 HELLO 5. And I put the values of this variables in the file text.txt. Here's the script:

for i in $(seq 1 5); do eval ${i}=$(cat << EOF "HELLO" $i EOF); done
cat > text.txt << EOF


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General :: Possible To Pass JavaScript Variables To Bash?

Apr 18, 2011

Can I pass javascript variables to bash script? If possible in bash script what code should I insert to receive javascript variables.

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General :: SQL Command Output To Bash Variables?

Aug 2, 2010

I would like to run a bunch of SQL commands from mysql client in bash. However, I would like to store the output in different variables. E.g.

var1=`mysql -u[user] -p[pass] -D[dbname] -e "Query1"`
var2=`mysql -u[user] -p[pass] -D[dbname] -e "Query2"`


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General :: Concatenate Two Environment Variables In Bash?

Nov 9, 2010

How do I concatenate two environment variables in bash?

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Software :: Bash Scripting And Integer Variables?

Jun 6, 2010

Are there numerical variables (like type int in C) in the shell script language of bash? Say I want a counter to increment each time a loop is traversed.

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Programming :: Bash: Making A Variable Out Of Two Other Variables?

Mar 18, 2010

I need to find the value of:

My script asks for the name you want to look up and I want it to return the value of $Namenumber

I was thinking:

but this returns


but does not actually resolve what the variable $Namenumber is equal to.

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Debian :: BASH Scripting - How To Use Variables With Filename Spaces

Jun 25, 2015

I am trying to create scripts to move files over from one directory to an ftp server and there is this one file with spaces that bash is see each word as being a file, here is the variable i am trying to use:

Code: Select allLOCL = '/mnt/cifs/"File name with spaces"/'
cd  $LOCL
ls -l

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General :: Sourcing Variables From ~/.bash.rc And Keeping Them Across Logouts

Sep 7, 2011

I've been writing a bunch of bash scripts to make possible non-interactive, secure, cron-based SVN checkouts with CollabNet's SVN client and GNOME Keyring Daemon (aka GKD) and one of the scripts was designed to start GKD, harvest its output, essentially a couple of environment variables, and export those variables in shell of a user the script is run as. All upon user login by sourcing a bash script in ~/.bashrc.The problem is that those environment variables will not be exported, because the script is being run in a sub-shell that exits upon it completion and environment variables get unset for good.Well, the question is how can those variables be set permanently, meaning they're exported and kept untouched even across login-logout sessions?

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Ubuntu :: Python - Export Variables To Bash Commands?

Feb 19, 2010

I created variables in python and would like to be able to incorporate those into bash commands that will be mixed into the script. Example:

name=raw_input("Type your name and press ENTER: ")
import os
os.system( echo "name")

Of course this doesn't actually work, but i think you get an indication of what I am trying to do.

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Ubuntu :: Assign Values To Bash Variables From A File?

Jun 9, 2010

Is there an easy way to get a line from a text file into a variable in a bash script?

I have a file called outside_temp that has a single number, say, 63.2

I would like to make a variable in a BASH script have that value.

I know how to use the input redirection and reassignment of stdin using code...

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Ubuntu :: Bash ${variables} : Replace Last Instance Of Regexp?

Mar 10, 2011

I have something like...

# echo ${var/%e/E} doesn't do anything because i can only replace "r" or "er" this way


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Ubuntu :: Cron Ignores Bash Script Variables

May 4, 2011

I have a personal server and a dynamic IP address, so I wrote a script to check the currently assigned IP address and compare it to the one stored in a file from the last check, and visit the update URL if it's different.

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