Mixing
import environment variables in a bash script
I set some environment variables in a terminal, and then run my script. How can I pull in the variables in the script? I need to know their values. Simply referring to them as $MY_VAR1 doesn't work; it is empty.
bash shell-script scripting environment-variables
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
add a comment |
I set some environment variables in a terminal, and then run my script. How can I pull in the variables in the script? I need to know their values. Simply referring to them as $MY_VAR1 doesn't work; it is empty.
bash shell-script scripting environment-variables
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22
add a comment |
I set some environment variables in a terminal, and then run my script. How can I pull in the variables in the script? I need to know their values. Simply referring to them as $MY_VAR1 doesn't work; it is empty.
bash shell-script scripting environment-variables
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
I set some environment variables in a terminal, and then run my script. How can I pull in the variables in the script? I need to know their values. Simply referring to them as $MY_VAR1 doesn't work; it is empty.
bash shell-script scripting environment-variables
bash shell-script scripting environment-variables
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
edited Jan 17 at 23:56
Jeff Schaller
42.3k1157134
42.3k1157134
asked Jan 17 at 20:53
MarkMark
5052624
asked Jan 17 at 20:53
MarkMark
5052624
asked Jan 17 at 20:53
MarkMark
5052624
5052624
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22
add a comment |
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22
add a comment |
2 Answers
2
active
oldest
votes
If the variables are truly environment variables (i.e., they've been exported with export) in the environment that invokes your script, then they would be available in your script. That they aren't suggests that you haven't exported them, or that you run the script from an environment where they simply don't exist even as shell variables.
Example:
$ cat script.sh
#!/bin/sh
echo "$hello"
$ sh script.sh
(one empty line of output since hello doesn't exist anywhere)
$ hello="hi there"
$ sh script.sh
(still only an empty line as output as hello is only a shell variable, not an environment variable)
$ export hello
$ sh script.sh
hi there
Alternatively, to set the environment variable just for this script and not in the calling environment:
$ hello="sorry, I'm busy" sh script.sh
sorry, I'm busy
$ env hello="this works too" sh script.sh
this works too
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
add a comment |
You need to ensure you export the environment variables you want to have access to in your script before you invoke the script. IE:
Unix> export MY_TEMP=/tmp
Unix> some_script.sh
Now some_script.sh would have access to $MY_TEMP -- when you invoke a shell script, you get a new environment, with only exported variables, unless you "source" it by preceeding the script command with a period (".") and a space, then your script name:
Unix> . some_script.sh # runs in current environment
Debugging tip: Include near the top of your script the set command to see what variables your script can see.
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f495161%2fimport-environment-variables-in-a-bash-script%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
If the variables are truly environment variables (i.e., they've been exported with export) in the environment that invokes your script, then they would be available in your script. That they aren't suggests that you haven't exported them, or that you run the script from an environment where they simply don't exist even as shell variables.
Example:
$ cat script.sh
#!/bin/sh
echo "$hello"
$ sh script.sh
(one empty line of output since hello doesn't exist anywhere)
$ hello="hi there"
$ sh script.sh
(still only an empty line as output as hello is only a shell variable, not an environment variable)
$ export hello
$ sh script.sh
hi there
Alternatively, to set the environment variable just for this script and not in the calling environment:
$ hello="sorry, I'm busy" sh script.sh
sorry, I'm busy
$ env hello="this works too" sh script.sh
this works too
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
add a comment |
If the variables are truly environment variables (i.e., they've been exported with export) in the environment that invokes your script, then they would be available in your script. That they aren't suggests that you haven't exported them, or that you run the script from an environment where they simply don't exist even as shell variables.
Example:
$ cat script.sh
#!/bin/sh
echo "$hello"
$ sh script.sh
(one empty line of output since hello doesn't exist anywhere)
$ hello="hi there"
$ sh script.sh
(still only an empty line as output as hello is only a shell variable, not an environment variable)
$ export hello
$ sh script.sh
hi there
Alternatively, to set the environment variable just for this script and not in the calling environment:
$ hello="sorry, I'm busy" sh script.sh
sorry, I'm busy
$ env hello="this works too" sh script.sh
this works too
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
add a comment |
If the variables are truly environment variables (i.e., they've been exported with export) in the environment that invokes your script, then they would be available in your script. That they aren't suggests that you haven't exported them, or that you run the script from an environment where they simply don't exist even as shell variables.
Example:
$ cat script.sh
#!/bin/sh
echo "$hello"
$ sh script.sh
(one empty line of output since hello doesn't exist anywhere)
$ hello="hi there"
$ sh script.sh
(still only an empty line as output as hello is only a shell variable, not an environment variable)
$ export hello
$ sh script.sh
hi there
Alternatively, to set the environment variable just for this script and not in the calling environment:
$ hello="sorry, I'm busy" sh script.sh
sorry, I'm busy
$ env hello="this works too" sh script.sh
this works too
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
If the variables are truly environment variables (i.e., they've been exported with export) in the environment that invokes your script, then they would be available in your script. That they aren't suggests that you haven't exported them, or that you run the script from an environment where they simply don't exist even as shell variables.
Example:
$ cat script.sh
#!/bin/sh
echo "$hello"
$ sh script.sh
(one empty line of output since hello doesn't exist anywhere)
$ hello="hi there"
$ sh script.sh
(still only an empty line as output as hello is only a shell variable, not an environment variable)
$ export hello
$ sh script.sh
hi there
Alternatively, to set the environment variable just for this script and not in the calling environment:
$ hello="sorry, I'm busy" sh script.sh
sorry, I'm busy
$ env hello="this works too" sh script.sh
this works too
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
edited Jan 17 at 21:22
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
answered Jan 17 at 20:55
KusalanandaKusalananda
132k17252416
132k17252416
add a comment |
add a comment |
You need to ensure you export the environment variables you want to have access to in your script before you invoke the script. IE:
Unix> export MY_TEMP=/tmp
Unix> some_script.sh
Now some_script.sh would have access to $MY_TEMP -- when you invoke a shell script, you get a new environment, with only exported variables, unless you "source" it by preceeding the script command with a period (".") and a space, then your script name:
Unix> . some_script.sh # runs in current environment
Debugging tip: Include near the top of your script the set command to see what variables your script can see.
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
add a comment |
You need to ensure you export the environment variables you want to have access to in your script before you invoke the script. IE:
Unix> export MY_TEMP=/tmp
Unix> some_script.sh
Now some_script.sh would have access to $MY_TEMP -- when you invoke a shell script, you get a new environment, with only exported variables, unless you "source" it by preceeding the script command with a period (".") and a space, then your script name:
Unix> . some_script.sh # runs in current environment
Debugging tip: Include near the top of your script the set command to see what variables your script can see.
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
add a comment |
You need to ensure you export the environment variables you want to have access to in your script before you invoke the script. IE:
Unix> export MY_TEMP=/tmp
Unix> some_script.sh
Now some_script.sh would have access to $MY_TEMP -- when you invoke a shell script, you get a new environment, with only exported variables, unless you "source" it by preceeding the script command with a period (".") and a space, then your script name:
Unix> . some_script.sh # runs in current environment
Debugging tip: Include near the top of your script the set command to see what variables your script can see.
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
You need to ensure you export the environment variables you want to have access to in your script before you invoke the script. IE:
Unix> export MY_TEMP=/tmp
Unix> some_script.sh
Now some_script.sh would have access to $MY_TEMP -- when you invoke a shell script, you get a new environment, with only exported variables, unless you "source" it by preceeding the script command with a period (".") and a space, then your script name:
Unix> . some_script.sh # runs in current environment
Debugging tip: Include near the top of your script the set command to see what variables your script can see.
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
answered Jan 17 at 21:00
Mark StewartMark Stewart
6181515
6181515
add a comment |
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f495161%2fimport-environment-variables-in-a-bash-script%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Possible duplicate of How can I pass an environment variable to a script?
– Julien Lopez
Jan 17 at 22:22