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What is the significance of $(logname)?
Difference between logname and $LOGNAMEWhat is the significance of single and double quotes in environment variables?What is the difference between 'env' and 'printenv'?What is the use of “export” command?How to prevent the caller's shell from being used in sudoDifference between logname and $LOGNAMEMaster environment script based on $LOGNAME to run on any shell invocationWhat are the environment variables by default?What is the meaning of “_=”?What is the effect of a path separator at the beginning of an environment variable?What is the status of setting environment variables without ~/.bash_profile?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
sudo sh -c 'echo "$(logname) ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/$(logname)' & sudo chmod 440 /etc/sudoers.d/$(logname)
I use the above one-liner to allow the current user to execute sudo without a password, on remotely connected hosts.
But what exactly is $(logname)?
On a local machine, echo $(logname) returns nothing, while echo $LOGNAME does, so it's not the environmental variable, although I have never seen the value to be any different on remote machines.
Also, are there any other similar $(foo) variables (or whatever they are called)?
environment-variables
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
add a comment |
sudo sh -c 'echo "$(logname) ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/$(logname)' & sudo chmod 440 /etc/sudoers.d/$(logname)
I use the above one-liner to allow the current user to execute sudo without a password, on remotely connected hosts.
But what exactly is $(logname)?
On a local machine, echo $(logname) returns nothing, while echo $LOGNAME does, so it's not the environmental variable, although I have never seen the value to be any different on remote machines.
Also, are there any other similar $(foo) variables (or whatever they are called)?
environment-variables
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
2
It appears thatecho $(logname)is in fact different toecho $LOGNAMEon remote hosts whensu'd into another account.
– paradroid
Aug 2 at 14:10
This look strange to me, you need sudo right (at least with password prompt) to executesudoin first place.
– Archemar
Aug 2 at 14:51
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15
add a comment |
sudo sh -c 'echo "$(logname) ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/$(logname)' & sudo chmod 440 /etc/sudoers.d/$(logname)
I use the above one-liner to allow the current user to execute sudo without a password, on remotely connected hosts.
But what exactly is $(logname)?
On a local machine, echo $(logname) returns nothing, while echo $LOGNAME does, so it's not the environmental variable, although I have never seen the value to be any different on remote machines.
Also, are there any other similar $(foo) variables (or whatever they are called)?
environment-variables
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
sudo sh -c 'echo "$(logname) ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/$(logname)' & sudo chmod 440 /etc/sudoers.d/$(logname)
I use the above one-liner to allow the current user to execute sudo without a password, on remotely connected hosts.
But what exactly is $(logname)?
On a local machine, echo $(logname) returns nothing, while echo $LOGNAME does, so it's not the environmental variable, although I have never seen the value to be any different on remote machines.
Also, are there any other similar $(foo) variables (or whatever they are called)?
environment-variables
environment-variables
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
edited Aug 2 at 14:03
paradroid
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
asked Aug 2 at 13:50
paradroidparadroid
4251 gold badge6 silver badges18 bronze badges
4251 gold badge6 silver badges18 bronze badges
2
It appears thatecho $(logname)is in fact different toecho $LOGNAMEon remote hosts whensu'd into another account.
– paradroid
Aug 2 at 14:10
This look strange to me, you need sudo right (at least with password prompt) to executesudoin first place.
– Archemar
Aug 2 at 14:51
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15
add a comment |
2
It appears thatecho $(logname)is in fact different toecho $LOGNAMEon remote hosts whensu'd into another account.
– paradroid
Aug 2 at 14:10
This look strange to me, you need sudo right (at least with password prompt) to executesudoin first place.
– Archemar
Aug 2 at 14:51
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15
2
2
It appears that
echo $(logname) is in fact different to echo $LOGNAME on remote hosts when su'd into another account.– paradroid
Aug 2 at 14:10
It appears that
echo $(logname) is in fact different to echo $LOGNAME on remote hosts when su'd into another account.– paradroid
Aug 2 at 14:10
This look strange to me, you need sudo right (at least with password prompt) to execute
sudo in first place.– Archemar
Aug 2 at 14:51
This look strange to me, you need sudo right (at least with password prompt) to execute
sudo in first place.– Archemar
Aug 2 at 14:51
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15
add a comment |
1 Answer
1
active
oldest
votes
logname(1) is a command that will return the login name of the current user.$( ... ) is the syntax for command substitution which is saying "substitute the output of the command here"
So if your user is foo you are executing:
sudo sh -c 'echo "foo ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/foo' & sudo chmod 440 /etc/sudoers.d/foo
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
add a comment |
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logname(1) is a command that will return the login name of the current user.$( ... ) is the syntax for command substitution which is saying "substitute the output of the command here"
So if your user is foo you are executing:
sudo sh -c 'echo "foo ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/foo' & sudo chmod 440 /etc/sudoers.d/foo
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
add a comment |
logname(1) is a command that will return the login name of the current user.$( ... ) is the syntax for command substitution which is saying "substitute the output of the command here"
So if your user is foo you are executing:
sudo sh -c 'echo "foo ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/foo' & sudo chmod 440 /etc/sudoers.d/foo
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
add a comment |
logname(1) is a command that will return the login name of the current user.$( ... ) is the syntax for command substitution which is saying "substitute the output of the command here"
So if your user is foo you are executing:
sudo sh -c 'echo "foo ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/foo' & sudo chmod 440 /etc/sudoers.d/foo
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
logname(1) is a command that will return the login name of the current user.$( ... ) is the syntax for command substitution which is saying "substitute the output of the command here"
So if your user is foo you are executing:
sudo sh -c 'echo "foo ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/foo' & sudo chmod 440 /etc/sudoers.d/foo
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
answered Aug 2 at 13:55
Jesse_bJesse_b
18.6k3 gold badges46 silver badges86 bronze badges
18.6k3 gold badges46 silver badges86 bronze badges
add a comment |
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2
It appears that
echo $(logname)is in fact different toecho $LOGNAMEon remote hosts whensu'd into another account.– paradroid
Aug 2 at 14:10
This look strange to me, you need sudo right (at least with password prompt) to execute
sudoin first place.– Archemar
Aug 2 at 14:51
Dupe unix.stackexchange.com/questions/268378/… . If command logname doesn't work on your 'local machine' it isn't POSIX-compliant.
– dave_thompson_085
Aug 3 at 2:15