How can I get an environment variable representing my machine ip?
I'm not sure how the scope of variables in /etc/environment works, nor when they get created, but I need a "global" environment variable that is populated with the ip address after a DHCP address is assigned so I can use that variable just like any variable defined in /etc/environment
For example, I assign hard-coded variables in /etc/environment such as:
TZ="America/New_York"
I can then use ${TZ} in **yml* configuration files and they will be populated with value assigned in /etc/environment
I need to be able to use ${ipv4} in my yml files which will have the machine's ip address (which is assigned via DHCP). How can I create this, keeping in mind I might not log into the machine.
I've done a little research and I know I can populate a value with the ip address by running the following executed from a bash prompt will populate foo with the correct ip.
foo=$(/sbin/ip -o -4 addr list enp0s3 | awk '{print $4}' | cut -d/ -f1)
ETA: Since my machine gets assigned an ip from my router's MAC address filtering option, I won't expect my ip to ever change unless I do so from the router, which I tend to do from time to time. So this is why I'm not hard coding the actual value into the file
boot 18.04 environment-variables
asked yesterday
Mike FormanMike Forman
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I'm not sure how the scope of variables in /etc/environment works, nor when they get created, but I need a "global" environment variable that is populated with the ip address after a DHCP address is assigned so I can use that variable just like any variable defined in /etc/environment
For example, I assign hard-coded variables in /etc/environment such as:
TZ="America/New_York"
I can then use ${TZ} in **yml* configuration files and they will be populated with value assigned in /etc/environment
I need to be able to use ${ipv4} in my yml files which will have the machine's ip address (which is assigned via DHCP). How can I create this, keeping in mind I might not log into the machine.
I've done a little research and I know I can populate a value with the ip address by running the following executed from a bash prompt will populate foo with the correct ip.
foo=$(/sbin/ip -o -4 addr list enp0s3 | awk '{print $4}' | cut -d/ -f1)
ETA: Since my machine gets assigned an ip from my router's MAC address filtering option, I won't expect my ip to ever change unless I do so from the router, which I tend to do from time to time. So this is why I'm not hard coding the actual value into the file
boot 18.04 environment-variables
asked yesterday
Mike FormanMike Forman
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Look into using the/etc/profilefile or creating a script in/etc/profile.d/folder that will run your command to set thefooas a global variable.
– Terrance
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to~/.bashrcwould run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your~/.profilefile, it would have to be sourced every time you wish to use it. You can source any file at any time.. /etc/profilewould source the file at that time.
– Terrance
yesterday
Your~/.profilefile is sourced at login as well.
– Terrance
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday
|
show 3 more comments
I'm not sure how the scope of variables in /etc/environment works, nor when they get created, but I need a "global" environment variable that is populated with the ip address after a DHCP address is assigned so I can use that variable just like any variable defined in /etc/environment
For example, I assign hard-coded variables in /etc/environment such as:
TZ="America/New_York"
I can then use ${TZ} in **yml* configuration files and they will be populated with value assigned in /etc/environment
I need to be able to use ${ipv4} in my yml files which will have the machine's ip address (which is assigned via DHCP). How can I create this, keeping in mind I might not log into the machine.
I've done a little research and I know I can populate a value with the ip address by running the following executed from a bash prompt will populate foo with the correct ip.
foo=$(/sbin/ip -o -4 addr list enp0s3 | awk '{print $4}' | cut -d/ -f1)
ETA: Since my machine gets assigned an ip from my router's MAC address filtering option, I won't expect my ip to ever change unless I do so from the router, which I tend to do from time to time. So this is why I'm not hard coding the actual value into the file
boot 18.04 environment-variables
asked yesterday
Mike FormanMike Forman
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm not sure how the scope of variables in /etc/environment works, nor when they get created, but I need a "global" environment variable that is populated with the ip address after a DHCP address is assigned so I can use that variable just like any variable defined in /etc/environment
For example, I assign hard-coded variables in /etc/environment such as:
TZ="America/New_York"
I can then use ${TZ} in **yml* configuration files and they will be populated with value assigned in /etc/environment
I need to be able to use ${ipv4} in my yml files which will have the machine's ip address (which is assigned via DHCP). How can I create this, keeping in mind I might not log into the machine.
I've done a little research and I know I can populate a value with the ip address by running the following executed from a bash prompt will populate foo with the correct ip.
foo=$(/sbin/ip -o -4 addr list enp0s3 | awk '{print $4}' | cut -d/ -f1)
ETA: Since my machine gets assigned an ip from my router's MAC address filtering option, I won't expect my ip to ever change unless I do so from the router, which I tend to do from time to time. So this is why I'm not hard coding the actual value into the file
boot 18.04 environment-variables
boot 18.04 environment-variables
asked yesterday
Mike FormanMike Forman
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Mike FormanMike Forman
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Mike FormanMike Forman
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Mike FormanMike Forman
61
asked yesterday
Mike FormanMike Forman
61
61
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Mike Forman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Look into using the/etc/profilefile or creating a script in/etc/profile.d/folder that will run your command to set thefooas a global variable.
– Terrance
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to~/.bashrcwould run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your~/.profilefile, it would have to be sourced every time you wish to use it. You can source any file at any time.. /etc/profilewould source the file at that time.
– Terrance
yesterday
Your~/.profilefile is sourced at login as well.
– Terrance
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday
|
show 3 more comments
Look into using the/etc/profilefile or creating a script in/etc/profile.d/folder that will run your command to set thefooas a global variable.
– Terrance
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to~/.bashrcwould run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your~/.profilefile, it would have to be sourced every time you wish to use it. You can source any file at any time.. /etc/profilewould source the file at that time.
– Terrance
yesterday
Your~/.profilefile is sourced at login as well.
– Terrance
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday
Look into using the
/etc/profile file or creating a script in /etc/profile.d/ folder that will run your command to set the foo as a global variable.– Terrance
yesterday
Look into using the
/etc/profile file or creating a script in /etc/profile.d/ folder that will run your command to set the foo as a global variable.– Terrance
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to
~/.bashrc would run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your ~/.profile file, it would have to be sourced every time you wish to use it. You can source any file at any time. . /etc/profile would source the file at that time.– Terrance
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to
~/.bashrc would run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your ~/.profile file, it would have to be sourced every time you wish to use it. You can source any file at any time. . /etc/profile would source the file at that time.– Terrance
yesterday
Your
~/.profile file is sourced at login as well.– Terrance
yesterday
Your
~/.profile file is sourced at login as well.– Terrance
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday
|
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Look into using the
/etc/profilefile or creating a script in/etc/profile.d/folder that will run your command to set thefooas a global variable.– Terrance
yesterday
Don't those only get executed upon login?
– Mike Forman
yesterday
This all depends on why you need to know what your IP address is. The host is already named for localhost. Localhost is a global variable already to the system. And yes, the profile would be only run at login. Or if you added it to
~/.bashrcwould run on every time you launched a terminal window, but that is not global and is only used in the present terminal session. If you added it to your~/.profilefile, it would have to be sourced every time you wish to use it. You can source any file at any time.. /etc/profilewould source the file at that time.– Terrance
yesterday
Your
~/.profilefile is sourced at login as well.– Terrance
yesterday
I need to know the ip address the DHCP server hands out to this machine, and I need it after it is assigned and not before waiting for someone to login, much less having a kludge to auto-login. So after the login window appears, I'd like to have XXX=192.168.1.46
– Mike Forman
yesterday