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0

I'm trying to make a script that gives me my current public IP, and asks the user for a new IP that should be declared as an environment variable for ubuntu, however even tho the MASTER variable is working as intended the SLAVE one isn't. here's a minimum sample of my script

#!/bin/bash 
echo $SHELLOPTS 
set -o allexport #All variables are auto set to export
MASTER=`ip addr | grep inet | grep 10. | tail -1 | sed 's/^ *//g' | cut -d ' ' -f 2 | sed 's//.*$//g'`
echo Master IP is: $MASTER
echo Insert the new IP:
read input
SLAVE=$input
echo Master IP is: $MASTER
echo Slave IP is: $SLAVE

Even tho the variable is actually printed, it cannot be reused more than once as an environment variable, I have been looking around this problem with no luck, any help will be really appreciated

command-line bash environment-variables

share|improve this question

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  If you want the shell variables to continue to exist after the script has finished, you need to source the script, like . scriptname. If you execute it rather than source it, it is run in a subshell and all environmental changes are lost when the subshell exits.
  
  – John1024
  4 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Or dont use a script at all but a function defined in .bashrc
  
  – Sergiy Kolodyazhnyy
  4 hours ago
  

  
  
  
  

add a comment | 

0

I'm trying to make a script that gives me my current public IP, and asks the user for a new IP that should be declared as an environment variable for ubuntu, however even tho the MASTER variable is working as intended the SLAVE one isn't. here's a minimum sample of my script

#!/bin/bash 
echo $SHELLOPTS 
set -o allexport #All variables are auto set to export
MASTER=`ip addr | grep inet | grep 10. | tail -1 | sed 's/^ *//g' | cut -d ' ' -f 2 | sed 's//.*$//g'`
echo Master IP is: $MASTER
echo Insert the new IP:
read input
SLAVE=$input
echo Master IP is: $MASTER
echo Slave IP is: $SLAVE

Even tho the variable is actually printed, it cannot be reused more than once as an environment variable, I have been looking around this problem with no luck, any help will be really appreciated

command-line bash environment-variables

share|improve this question

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  If you want the shell variables to continue to exist after the script has finished, you need to source the script, like . scriptname. If you execute it rather than source it, it is run in a subshell and all environmental changes are lost when the subshell exits.
  
  – John1024
  4 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Or dont use a script at all but a function defined in .bashrc
  
  – Sergiy Kolodyazhnyy
  4 hours ago
  

  
  
  
  

add a comment | 

I'm trying to make a script that gives me my current public IP, and asks the user for a new IP that should be declared as an environment variable for ubuntu, however even tho the MASTER variable is working as intended the SLAVE one isn't. here's a minimum sample of my script

#!/bin/bash 
echo $SHELLOPTS 
set -o allexport #All variables are auto set to export
MASTER=`ip addr | grep inet | grep 10. | tail -1 | sed 's/^ *//g' | cut -d ' ' -f 2 | sed 's//.*$//g'`
echo Master IP is: $MASTER
echo Insert the new IP:
read input
SLAVE=$input
echo Master IP is: $MASTER
echo Slave IP is: $SLAVE

Even tho the variable is actually printed, it cannot be reused more than once as an environment variable, I have been looking around this problem with no luck, any help will be really appreciated

command-line bash environment-variables

share|improve this question

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

#!/bin/bash 
echo $SHELLOPTS 
set -o allexport #All variables are auto set to export
MASTER=`ip addr | grep inet | grep 10. | tail -1 | sed 's/^ *//g' | cut -d ' ' -f 2 | sed 's//.*$//g'`
echo Master IP is: $MASTER
echo Insert the new IP:
read input
SLAVE=$input
echo Master IP is: $MASTER
echo Slave IP is: $SLAVE

share|improve this question

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 hours ago

GoatZeroGoatZero

1011

New contributor

GoatZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 hours ago

GoatZeroGoatZero

1011