Sponsored Content
Top Forums Shell Programming and Scripting problem with setting environment variable Post 302575935 by harshvardhan360 on Wednesday 23rd of November 2011 09:10:29 AM
Old 11-23-2011
problem with setting environment variable

shell script: #!/bin/csh set VAR=12345 echo $VAR

will peacefully give the output 12345 at shell. I need to use C++ to do the same in some part of the code:

string str = "12345";
retValue="set var1= "+str;
system(retValue1.c_str());
system("echo $var1");

This doesn't create a system variable var1 and echos null which is understandable as each system function would create a child process with different environment variables. So I combine them as follows using just one system function...but it echos null again.

retValue="set var1= "+str;
retValue1=retValue+";\n echo $var1";
system(retValue1.c_str());

Can someone please guide me to set up the system variable thru C++. Thanks a lot in advance!
 

10 More Discussions You Might Find Interesting

1. Programming

Setting Environment Variable date

Hi to all... I'm currently running a C++ program in Unix environment and it is dependent to a Unix environment variable with a date value. ex: echo $DateToday 20060403 I want to change that date in my C++ program, changing the value date to 20061120 and revert back to original... (6 Replies)
Discussion started by: d3ck_tm
6 Replies

2. Programming

Setting environment variable using JNI call

I have function declaration in Java and same function definition written in C programming language.. A JNI call from Java is made to a fuction...Function would set the environment variable { putenv(cEnvString1);} using C-built -in function ..and later return the encrypted string... putenv is... (6 Replies)
Discussion started by: shafi2all
6 Replies

3. UNIX for Dummies Questions & Answers

setting environment variable in awk

Dear all, I have a data sample... Dose: Summed ROI: Bladder ************************** Bin Dose Volume 001 0.700 100.000 002 0.715 99.998 168 3.142 0.368 169 3.157 0.338 170 3.171 0.292 Dose: Summed ROI:... (2 Replies)
Discussion started by: tintin72
2 Replies

4. Programming

Setting Environment variable..!

Hi, I already have one CPP program which invokes the C program.And the C program contains whole function definitions..!This is a working program..I have to enable the logs in both CPP as well as in the C program ..!So I am reading the enviornmental variable log path from the CPP and doing the... (2 Replies)
Discussion started by: Kattoor
2 Replies

5. Shell Programming and Scripting

Setting Environment variable from value in file

I've searched Google and now this forum. Best guess is my search fu is not good (and it probably isn't). The Google search did bring me here. Background I have a number of Korn Shell scripts who all use one of 3 values for an environment variable used in the backup system. On occasion one or... (8 Replies)
Discussion started by: WolfBrother
8 Replies

6. Shell Programming and Scripting

Setting environment variable using shell script

Hi All, I'm trying to write an menu driven program to automate some functions which involve loging to multiple hosts. The hosts can differ for every use, so I thought I would use an config file to get the hostnames. Now I need to set those values in the config file to environment variable to... (6 Replies)
Discussion started by: arun_maffy
6 Replies

7. Shell Programming and Scripting

Dynamically setting of environment variable... Can it be done?

Hi all, I am fairly new to unix scripting and will like to know how to dynamically set the name of an environment variable to be used. We have a .env file where we defined the names and locations of data files, trigger files, directories .... etc Example of variables defined in .env... (4 Replies)
Discussion started by: Morelia
4 Replies

8. UNIX for Dummies Questions & Answers

setting a environment variable on linux

I want to set a enviroment variable VDC_DIR to a particular directory. I am doing it as export VDC_DIR=/abc it gets set but when i logout and do relogin than its not there. one way could be setting it in .profile file. but i have seen it on another box where it is not present in... (2 Replies)
Discussion started by: Jcpratap
2 Replies

9. UNIX for Dummies Questions & Answers

Setting environment variable problem in Ubuntu?

I am trying to install timbl- memory based learner tools in ubuntu. it after unpacking the tar file it brings the following msg No package 'ticcutils' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you... (1 Reply)
Discussion started by: gbdaw
1 Replies

10. UNIX for Dummies Questions & Answers

STTY Columns Setting Environment Variable?

I am wondering about the following: stty columns 140 I have found that a number of times I need to set my display columns to a high number (such as 140) but I have to do this every time I login to use putty/ssh. Can we set this with an environmental variable so that it is permanent? Also... (4 Replies)
Discussion started by: newbie2010
4 Replies
ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
All times are GMT -4. The time now is 08:43 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy