Doing math using user defined input and system environment variables Post: 302886463

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Expanding Variables in User Input

If have var='$variable' how can I expand $variable. I have tried many thing like duble quotes/braces etc, but nothing worked. I need the solution ASAP.

2. Linux

environment variable is not defined

moved to correct thread

3. Programming

Math with user variables

Hi everybody: I have a problem about use variables. I 've created this variable: var=`wc -l file.txt | cut -c 1-2`; n_var="$var"-1 ; echo $n_var; In my case var is 8. When echo shows $n_var does not appear as I want. The question is how can I subtract, this is operate, to my variable....

4. Shell Programming and Scripting

Force Input in User Defined Variable

In a line such as: echo -n "How many days back would you like to check? "; read days How can I ensure that the user has a.) entered a number between 1-30 (not 0 or 31+) and b.) has not just hit enter (ie set it to "") and if it's entered wrong, how do I start the if statement over? I...

5. Shell Programming and Scripting

awk printf for user defined variables

I am working on a SunFire 480 - uname -a gives: SunOS bsmdb02 5.9 Generic_112233-08 sun4u sparc SUNW,Sun-Fire-480R I am tyring to sum up the total size of all the directories for each running database using awk: #!/usr/bin/ksh for Database in `ps -efl | grep "ora_pmon" | grep -v grep |...

6. Shell Programming and Scripting

Unix $USER and $LOGNAME environment variables

Hi, I am wondering what is the difference between the USER and LOGNAME environment variables, and under what situations would they be different? I am using Ubuntu 8.04 32-bit and I do not have 'login' command to test it.

7. Shell Programming and Scripting

How to automatically create variables from user input in ksh?

I need some help to write a ksh script. My code so far (pretty bad, sorry): #! /bin/ksh echo "Calculate average" UserDecision=y while test $UserDecision = y do echo "Enter a number: " read Number1 echo "Enter a number: " read Number2 echo "Do you want to enter another number?...

8. Shell Programming and Scripting

Run script through cron with user environment variables

Hi everyone, I wrote a script that is supposed to be run by cron on a daily basis. It works just fine if I run it manually, but due to a lack of environment variables (which are available during my user session but not when cron runs the script) it keeps failing to run successfully. Here's the...

9. UNIX for Beginners Questions & Answers

How are environment variables defined in a Gnome terminal session?

Hello... and thanks in advance for any help anyone can offer me with my question! I'm hoping someone will have a little patience with me and walk me through this! I'm trying to understand a user login process on Centos 7 and I've gotten a bit confused trying to figure out when/how a Gnome...

10. Shell Programming and Scripting

UNIX $USER and $LOGNAME environment variables

I have some comments about a previously closed topic whose name is the same as above Omitted from the discussion was the situation with a "sudo command or sudo within a script". There is an inconsistency between systems. On some systems $LOGNAME is invariant, on others, on RedHat sudo...

LEARN ABOUT DEBIAN

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Expanding Variables in User Input

Discussion started by: Bsk

2. Linux

environment variable is not defined

Discussion started by: alien12

3. Programming

Math with user variables

Discussion started by: tonet

4. Shell Programming and Scripting

Force Input in User Defined Variable

Discussion started by: earnstaf