clear out all variables without closing terminal
9
I want to know how to clear all variables which I defined in command prompt without closing terminal ?
for example, if I set a variable in command prompt as:
$ a=1
now I want to delete the variable $a (and many other variables defined in similar way) without closing terminal. I could use unset but it will be hectic if there are large no. of variables
shell environment-variables
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
|
show 8 more comments
9
I want to know how to clear all variables which I defined in command prompt without closing terminal ?
for example, if I set a variable in command prompt as:
$ a=1
now I want to delete the variable $a (and many other variables defined in similar way) without closing terminal. I could use unset but it will be hectic if there are large no. of variables
shell environment-variables
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
2
exec "$0"maybe - but it's hard to tell what you mean by global.
– mikeserv
Dec 10 '14 at 23:07
3
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
1
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
1
@muru - he gets a list saved to a$varwithvar=$(declare -p +F);then passes that as an argument to a function which doesecho "${2%%=*}".That answer has a few problems with sheer size - but it should work if your environment isn't huge.
– mikeserv
Dec 10 '14 at 23:34
3
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49
|
show 8 more comments
9
9
9
1
I want to know how to clear all variables which I defined in command prompt without closing terminal ?
for example, if I set a variable in command prompt as:
$ a=1
now I want to delete the variable $a (and many other variables defined in similar way) without closing terminal. I could use unset but it will be hectic if there are large no. of variables
shell environment-variables
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
I want to know how to clear all variables which I defined in command prompt without closing terminal ?
for example, if I set a variable in command prompt as:
$ a=1
now I want to delete the variable $a (and many other variables defined in similar way) without closing terminal. I could use unset but it will be hectic if there are large no. of variables
shell environment-variables
shell environment-variables
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
edited Dec 11 '14 at 0:40
Braiam
23.6k2077140
23.6k2077140
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
asked Dec 10 '14 at 23:06
Edward TorvaldsEdward Torvalds
2,59373263
2,59373263
2
exec "$0"maybe - but it's hard to tell what you mean by global.
– mikeserv
Dec 10 '14 at 23:07
3
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
1
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
1
@muru - he gets a list saved to a$varwithvar=$(declare -p +F);then passes that as an argument to a function which doesecho "${2%%=*}".That answer has a few problems with sheer size - but it should work if your environment isn't huge.
– mikeserv
Dec 10 '14 at 23:34
3
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49
|
show 8 more comments
2
exec "$0"maybe - but it's hard to tell what you mean by global.
– mikeserv
Dec 10 '14 at 23:07
3
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
1
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
1
@muru - he gets a list saved to a$varwithvar=$(declare -p +F);then passes that as an argument to a function which doesecho "${2%%=*}".That answer has a few problems with sheer size - but it should work if your environment isn't huge.
– mikeserv
Dec 10 '14 at 23:34
3
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49
2
2
exec "$0"maybe - but it's hard to tell what you mean by global.– mikeserv
Dec 10 '14 at 23:07
exec "$0"maybe - but it's hard to tell what you mean by global.– mikeserv
Dec 10 '14 at 23:07
3
3
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
1
1
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
1
1
@muru - he gets a list saved to a
$var with var=$(declare -p +F); then passes that as an argument to a function which does echo "${2%%=*}". That answer has a few problems with sheer size - but it should work if your environment isn't huge.– mikeserv
Dec 10 '14 at 23:34
@muru - he gets a list saved to a
$var with var=$(declare -p +F); then passes that as an argument to a function which does echo "${2%%=*}". That answer has a few problems with sheer size - but it should work if your environment isn't huge.– mikeserv
Dec 10 '14 at 23:34
3
3
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49
|
show 8 more comments
2 Answers
2
active
oldest
votes
9
If you do
exec bash
you will use a fresh & new environnement
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
what aboutexec "$0"?
– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds$0is the zeroth argument to an executed shell. So, if you're runningbash$0isbash(probably - it might be-bashin a-login shell case depending on version). If you're running a script with a#!/bin/bashbangline,$0is the path to the script.exec "$0"is probably more flexible, butexec bashis more explicit. If you enter that command at a terminal,bashshould recognize it's in an interactive environment and do the equivalent ofbash -i- which will get your~/.bashrcfile run as well.
– mikeserv
Dec 11 '14 at 21:32
add a comment |
0
You could use env, which is provided by GNU coreutils (typically preinstalled on GNU/Linux systems):
exec env --ignore-environment "$0"
The exec system call is so that your current process is replaced in-place by the new, environment-less version of your shell.
This has the benefit to also clear any exported environment variables.
answered 10 mins ago
user30747user30747
1212
add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
9
If you do
exec bash
you will use a fresh & new environnement
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
what aboutexec "$0"?
– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds$0is the zeroth argument to an executed shell. So, if you're runningbash$0isbash(probably - it might be-bashin a-login shell case depending on version). If you're running a script with a#!/bin/bashbangline,$0is the path to the script.exec "$0"is probably more flexible, butexec bashis more explicit. If you enter that command at a terminal,bashshould recognize it's in an interactive environment and do the equivalent ofbash -i- which will get your~/.bashrcfile run as well.
– mikeserv
Dec 11 '14 at 21:32
add a comment |
9
If you do
exec bash
you will use a fresh & new environnement
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
what aboutexec "$0"?
– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds$0is the zeroth argument to an executed shell. So, if you're runningbash$0isbash(probably - it might be-bashin a-login shell case depending on version). If you're running a script with a#!/bin/bashbangline,$0is the path to the script.exec "$0"is probably more flexible, butexec bashis more explicit. If you enter that command at a terminal,bashshould recognize it's in an interactive environment and do the equivalent ofbash -i- which will get your~/.bashrcfile run as well.
– mikeserv
Dec 11 '14 at 21:32
add a comment |
9
9
9
If you do
exec bash
you will use a fresh & new environnement
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
If you do
exec bash
you will use a fresh & new environnement
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
answered Dec 11 '14 at 19:46
Gilles QuenotGilles Quenot
16.2k13951
16.2k13951
what aboutexec "$0"?
– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds$0is the zeroth argument to an executed shell. So, if you're runningbash$0isbash(probably - it might be-bashin a-login shell case depending on version). If you're running a script with a#!/bin/bashbangline,$0is the path to the script.exec "$0"is probably more flexible, butexec bashis more explicit. If you enter that command at a terminal,bashshould recognize it's in an interactive environment and do the equivalent ofbash -i- which will get your~/.bashrcfile run as well.
– mikeserv
Dec 11 '14 at 21:32
add a comment |
what aboutexec "$0"?
– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds$0is the zeroth argument to an executed shell. So, if you're runningbash$0isbash(probably - it might be-bashin a-login shell case depending on version). If you're running a script with a#!/bin/bashbangline,$0is the path to the script.exec "$0"is probably more flexible, butexec bashis more explicit. If you enter that command at a terminal,bashshould recognize it's in an interactive environment and do the equivalent ofbash -i- which will get your~/.bashrcfile run as well.
– mikeserv
Dec 11 '14 at 21:32
what about
exec "$0" ?– Edward Torvalds
Dec 11 '14 at 21:04
what about
exec "$0" ?– Edward Torvalds
Dec 11 '14 at 21:04
@edwardtorvalds
$0 is the zeroth argument to an executed shell. So, if you're running bash $0 is bash (probably - it might be -bash in a -login shell case depending on version). If you're running a script with a #!/bin/bash bangline, $0 is the path to the script. exec "$0" is probably more flexible, but exec bash is more explicit. If you enter that command at a terminal, bash should recognize it's in an interactive environment and do the equivalent of bash -i - which will get your ~/.bashrc file run as well.– mikeserv
Dec 11 '14 at 21:32
@edwardtorvalds
$0 is the zeroth argument to an executed shell. So, if you're running bash $0 is bash (probably - it might be -bash in a -login shell case depending on version). If you're running a script with a #!/bin/bash bangline, $0 is the path to the script. exec "$0" is probably more flexible, but exec bash is more explicit. If you enter that command at a terminal, bash should recognize it's in an interactive environment and do the equivalent of bash -i - which will get your ~/.bashrc file run as well.– mikeserv
Dec 11 '14 at 21:32
add a comment |
0
You could use env, which is provided by GNU coreutils (typically preinstalled on GNU/Linux systems):
exec env --ignore-environment "$0"
The exec system call is so that your current process is replaced in-place by the new, environment-less version of your shell.
This has the benefit to also clear any exported environment variables.
answered 10 mins ago
user30747user30747
1212
add a comment |
0
You could use env, which is provided by GNU coreutils (typically preinstalled on GNU/Linux systems):
exec env --ignore-environment "$0"
The exec system call is so that your current process is replaced in-place by the new, environment-less version of your shell.
This has the benefit to also clear any exported environment variables.
answered 10 mins ago
user30747user30747
1212
add a comment |
0
0
0
You could use env, which is provided by GNU coreutils (typically preinstalled on GNU/Linux systems):
exec env --ignore-environment "$0"
The exec system call is so that your current process is replaced in-place by the new, environment-less version of your shell.
This has the benefit to also clear any exported environment variables.
answered 10 mins ago
user30747user30747
1212
You could use env, which is provided by GNU coreutils (typically preinstalled on GNU/Linux systems):
exec env --ignore-environment "$0"
The exec system call is so that your current process is replaced in-place by the new, environment-less version of your shell.
This has the benefit to also clear any exported environment variables.
answered 10 mins ago
user30747user30747
1212
answered 10 mins ago
user30747user30747
1212
answered 10 mins ago
user30747user30747
1212
answered 10 mins ago
user30747user30747
1212
1212
add a comment |
add a comment |
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2
exec "$0"maybe - but it's hard to tell what you mean by global.– mikeserv
Dec 10 '14 at 23:07
3
Why do you want to do that?
– Hauke Laging
Dec 10 '14 at 23:12
1
@HaukeLaging I am working with arrays using script. I sometimes add one element to it. because of which I cant run the script with old values(since array is changed). i have to close the terminal and start a new session again. I hope I made clear. if not please let me know :)
– Edward Torvalds
Dec 10 '14 at 23:18
1
@muru - he gets a list saved to a
$varwithvar=$(declare -p +F);then passes that as an argument to a function which doesecho "${2%%=*}".That answer has a few problems with sheer size - but it should work if your environment isn't huge.– mikeserv
Dec 10 '14 at 23:34
3
I have no idea what you're trying to do. Are you talking about an interactive shell or a script? Variables set in a script executed from an interactive shell don't affect the parent shell. Tell us what you want to achieve, not which dead end you're pursuing.
– Gilles
Dec 10 '14 at 23:49