Reading system varibles in script
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I am trying to read a system variable that is XDG_CURRENT_DESKTOP from a shell script.
echo the variable in terminal works fine.
but when running it within a bash script it echoes empty due to that the script runs from an child shell
I cannot export it, I don't know the source of the varible.
is there any way to import a system variable without messing with bashrc?
/Pierre
bash scripts environment-variables
asked Nov 29 at 10:56
Pierre Den Gode
93
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up vote
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favorite
I am trying to read a system variable that is XDG_CURRENT_DESKTOP from a shell script.
echo the variable in terminal works fine.
but when running it within a bash script it echoes empty due to that the script runs from an child shell
I cannot export it, I don't know the source of the varible.
is there any way to import a system variable without messing with bashrc?
/Pierre
bash scripts environment-variables
asked Nov 29 at 10:56
Pierre Den Gode
93
Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am trying to read a system variable that is XDG_CURRENT_DESKTOP from a shell script.
echo the variable in terminal works fine.
but when running it within a bash script it echoes empty due to that the script runs from an child shell
I cannot export it, I don't know the source of the varible.
is there any way to import a system variable without messing with bashrc?
/Pierre
bash scripts environment-variables
asked Nov 29 at 10:56
Pierre Den Gode
93
I am trying to read a system variable that is XDG_CURRENT_DESKTOP from a shell script.
echo the variable in terminal works fine.
but when running it within a bash script it echoes empty due to that the script runs from an child shell
I cannot export it, I don't know the source of the varible.
is there any way to import a system variable without messing with bashrc?
/Pierre
bash scripts environment-variables
bash scripts environment-variables
asked Nov 29 at 10:56
Pierre Den Gode
93
asked Nov 29 at 10:56
Pierre Den Gode
93
asked Nov 29 at 10:56
Pierre Den Gode
93
asked Nov 29 at 10:56
Pierre Den Gode
93
asked Nov 29 at 10:56
Pierre Den Gode
93
93
Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26
add a comment |
Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26
Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26
add a comment |
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Not sure exactly what you mean by, "... echoes empty due to that the script runs from an child shell" Are you saying you have a shell script that runs, "echo ${XDG_CURRENT_DESKTOP}" and if you run that script from a shell it prints out a blank line (i.e. XDG_CURRENT_DESKTOP is not set)?
– Lewis M
Nov 29 at 12:48
When you run a script, it runs in a subshell. Variables are only valid within the context of that subshell. and "system varibles" like XDG_CURRENT_DESKTOP are not included in the subshell, so no XDG_CURRENT_DESKTOP is not set in the subshell.
– Pierre Den Gode
Nov 30 at 9:26