source /etc/environment not working from bash script





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0















Running Ubuntu 18.04-x64



I run the following bash script:



#!/bin/bash

if [ -z $JAVA_HOME ]; then

    PLACE=`which java`

    QUOTE='"'

    VAR_NAME="JAVA_HOME="

    echo "$VAR_NAME$QUOTE$PLACE$QUOTE" >> /etc/environment

fi

source /etc/environment


I run echo $JAVA_HOME and get a blank output



If I enter the following commands in the terminal



source /etc/environment

echo $JAVA_HOME


I get /usr/bin/java as output



Why is source /etc/environment not working inside the script?






command-line bash scripts environment-variables







share|improve this question


















  • 1





    Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

    – steeldriver
    Mar 28 at 16:42


















0















Running Ubuntu 18.04-x64



I run the following bash script:



#!/bin/bash

if [ -z $JAVA_HOME ]; then

    PLACE=`which java`

    QUOTE='"'

    VAR_NAME="JAVA_HOME="

    echo "$VAR_NAME$QUOTE$PLACE$QUOTE" >> /etc/environment

fi

source /etc/environment


I run echo $JAVA_HOME and get a blank output



If I enter the following commands in the terminal



source /etc/environment

echo $JAVA_HOME


I get /usr/bin/java as output



Why is source /etc/environment not working inside the script?






command-line bash scripts environment-variables







share|improve this question


















  • 1





    Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

    – steeldriver
    Mar 28 at 16:42














0












0








0








Running Ubuntu 18.04-x64



I run the following bash script:



#!/bin/bash

if [ -z $JAVA_HOME ]; then

    PLACE=`which java`

    QUOTE='"'

    VAR_NAME="JAVA_HOME="

    echo "$VAR_NAME$QUOTE$PLACE$QUOTE" >> /etc/environment

fi

source /etc/environment


I run echo $JAVA_HOME and get a blank output



If I enter the following commands in the terminal



source /etc/environment

echo $JAVA_HOME


I get /usr/bin/java as output



Why is source /etc/environment not working inside the script?






command-line bash scripts environment-variables







share|improve this question














Running Ubuntu 18.04-x64



I run the following bash script:



#!/bin/bash

if [ -z $JAVA_HOME ]; then

    PLACE=`which java`

    QUOTE='"'

    VAR_NAME="JAVA_HOME="

    echo "$VAR_NAME$QUOTE$PLACE$QUOTE" >> /etc/environment

fi

source /etc/environment


I run echo $JAVA_HOME and get a blank output



If I enter the following commands in the terminal



source /etc/environment

echo $JAVA_HOME


I get /usr/bin/java as output



Why is source /etc/environment not working inside the script?






command-line bash scripts environment-variables




command-line bash scripts environment-variables






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 28 at 16:29









CrispJamCrispJam

53




53








  • 1





    Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

    – steeldriver
    Mar 28 at 16:42














  • 1





    Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

    – steeldriver
    Mar 28 at 16:42








1




1





Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

– steeldriver
Mar 28 at 16:42





Are you running echo $JAVA_HOME from inside the script, or from the parent shell after executing the script? The source command can only alter the environment of the former (unless you source the script itself)

– steeldriver
Mar 28 at 16:42










1 Answer
1






active

oldest

votes


















2














You could source your script instead of executing it. Then the script's source command occurs in your current shell.



Also, JAVA_HOME should be a directory: 



printf 'JAVA_HOME="%s"n' "$(dirname -- "$PLACE")" >> /etc/environment


that also allows you to drop the VAR and QUOTE vars



Also, you must use quotes: [ -z "$JAVA_HOME" ]




  • if JAVA_HOME is actually empty, the shell sees [ -z ]

  • with only a single argument, the [ command returns true if the argument itself is not empty.

  • Since the string "-z" is never empty, the condition is always true,

  • and you'll get a new JAVA_HOME=... in the /etc/environment every time.






share|improve this answer



















  • 1





    Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

    – PerlDuck
    Mar 28 at 18:56












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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














You could source your script instead of executing it. Then the script's source command occurs in your current shell.



Also, JAVA_HOME should be a directory: 



printf 'JAVA_HOME="%s"n' "$(dirname -- "$PLACE")" >> /etc/environment


that also allows you to drop the VAR and QUOTE vars



Also, you must use quotes: [ -z "$JAVA_HOME" ]




  • if JAVA_HOME is actually empty, the shell sees [ -z ]

  • with only a single argument, the [ command returns true if the argument itself is not empty.

  • Since the string "-z" is never empty, the condition is always true,

  • and you'll get a new JAVA_HOME=... in the /etc/environment every time.






share|improve this answer



















  • 1





    Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

    – PerlDuck
    Mar 28 at 18:56
















2














You could source your script instead of executing it. Then the script's source command occurs in your current shell.



Also, JAVA_HOME should be a directory: 



printf 'JAVA_HOME="%s"n' "$(dirname -- "$PLACE")" >> /etc/environment


that also allows you to drop the VAR and QUOTE vars



Also, you must use quotes: [ -z "$JAVA_HOME" ]




  • if JAVA_HOME is actually empty, the shell sees [ -z ]

  • with only a single argument, the [ command returns true if the argument itself is not empty.

  • Since the string "-z" is never empty, the condition is always true,

  • and you'll get a new JAVA_HOME=... in the /etc/environment every time.






share|improve this answer



















  • 1





    Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

    – PerlDuck
    Mar 28 at 18:56














2












2








2







You could source your script instead of executing it. Then the script's source command occurs in your current shell.



Also, JAVA_HOME should be a directory: 



printf 'JAVA_HOME="%s"n' "$(dirname -- "$PLACE")" >> /etc/environment


that also allows you to drop the VAR and QUOTE vars



Also, you must use quotes: [ -z "$JAVA_HOME" ]




  • if JAVA_HOME is actually empty, the shell sees [ -z ]

  • with only a single argument, the [ command returns true if the argument itself is not empty.

  • Since the string "-z" is never empty, the condition is always true,

  • and you'll get a new JAVA_HOME=... in the /etc/environment every time.






share|improve this answer













You could source your script instead of executing it. Then the script's source command occurs in your current shell.



Also, JAVA_HOME should be a directory: 



printf 'JAVA_HOME="%s"n' "$(dirname -- "$PLACE")" >> /etc/environment


that also allows you to drop the VAR and QUOTE vars



Also, you must use quotes: [ -z "$JAVA_HOME" ]




  • if JAVA_HOME is actually empty, the shell sees [ -z ]

  • with only a single argument, the [ command returns true if the argument itself is not empty.

  • Since the string "-z" is never empty, the condition is always true,

  • and you'll get a new JAVA_HOME=... in the /etc/environment every time.







share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 28 at 17:31









glenn jackmanglenn jackman

12.8k2545




12.8k2545








  • 1





    Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

    – PerlDuck
    Mar 28 at 18:56














  • 1





    Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

    – PerlDuck
    Mar 28 at 18:56








1




1





Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

– PerlDuck
Mar 28 at 18:56





Note that /etc/environment does not use shell syntax and the quotes might be dangerous: X="Y" will set X to "Y" (including the quotes).

– PerlDuck
Mar 28 at 18:56


















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