In bash, how do I list environment variables matching “MY

In bash, how do I list environment variables matching “MY_VAR” and then export them?

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I want to export all environment variables beginning with "MY_VAR_".
How do I do this?

edited Nov 20 at 20:13

Rui F Ribeiro

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asked Nov 20 at 17:00

virasana

New contributor

1

The variables whose names begin with that, or the variables whose values begin with that? Also, do you mean environment variables (exported shell variables) in particular, or just all shell variables?
– ilkkachu
Nov 20 at 17:05

Environment variables are already exported. What do want to achieve in the end?
– Kusalananda
Nov 21 at 8:03

add a comment |

up vote
0
down vote

favorite

I want to export all environment variables beginning with "MY_VAR_".
How do I do this?

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

asked Nov 20 at 17:00

virasana

New contributor

1

The variables whose names begin with that, or the variables whose values begin with that? Also, do you mean environment variables (exported shell variables) in particular, or just all shell variables?
– ilkkachu
Nov 20 at 17:05

Environment variables are already exported. What do want to achieve in the end?
– Kusalananda
Nov 21 at 8:03

add a comment |

up vote
0
down vote

favorite

I want to export all environment variables beginning with "MY_VAR_".
How do I do this?

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

asked Nov 20 at 17:00

virasana

New contributor

I want to export all environment variables beginning with "MY_VAR_".
How do I do this?

bash environment-variables

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

asked Nov 20 at 17:00

virasana

New contributor

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

asked Nov 20 at 17:00

virasana

New contributor

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

edited Nov 20 at 20:13

Rui F Ribeiro

38.2k1475125

asked Nov 20 at 17:00

virasana

New contributor

asked Nov 20 at 17:00

virasana

asked Nov 20 at 17:00

virasana

New contributor

virasana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

1

The variables whose names begin with that, or the variables whose values begin with that? Also, do you mean environment variables (exported shell variables) in particular, or just all shell variables?
– ilkkachu
Nov 20 at 17:05

Environment variables are already exported. What do want to achieve in the end?
– Kusalananda
Nov 21 at 8:03

add a comment |

1

The variables whose names begin with that, or the variables whose values begin with that? Also, do you mean environment variables (exported shell variables) in particular, or just all shell variables?
– ilkkachu
Nov 20 at 17:05

Environment variables are already exported. What do want to achieve in the end?
– Kusalananda
Nov 21 at 8:03

The variables whose names begin with that, or the variables whose values begin with that? Also, do you mean environment variables (exported shell variables) in particular, or just all shell variables?
– ilkkachu
Nov 20 at 17:05

Environment variables are already exported. What do want to achieve in the end?
– Kusalananda
Nov 21 at 8:03

add a comment |

1 Answer
1

active

oldest

votes

up vote
4
down vote

As export of an already exported variable is no-op:

export "$!MY_VAR_@"

Will export all variables that start with MY_VAR_.

If you only want the list of exported variables that start with MY_VAR_:

env | grep '^MY_VAR_'

Or (calling an external program only keeps exported variables):

bash -c 'printf %s\n "$!MY_VAR_@"'

Or, if you have completion available (it is loaded by default):

$ compgen -A export MY_VAR_
MY_VAR_aa
MY_VAR_bb
MY_VAR_ss

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
4
down vote

As export of an already exported variable is no-op:

export "$!MY_VAR_@"

Will export all variables that start with MY_VAR_.

If you only want the list of exported variables that start with MY_VAR_:

env | grep '^MY_VAR_'

Or (calling an external program only keeps exported variables):

bash -c 'printf %s\n "$!MY_VAR_@"'

Or, if you have completion available (it is loaded by default):

$ compgen -A export MY_VAR_
MY_VAR_aa
MY_VAR_bb
MY_VAR_ss

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

add a comment |

up vote
4
down vote

As export of an already exported variable is no-op:

export "$!MY_VAR_@"

Will export all variables that start with MY_VAR_.

If you only want the list of exported variables that start with MY_VAR_:

env | grep '^MY_VAR_'

Or (calling an external program only keeps exported variables):

bash -c 'printf %s\n "$!MY_VAR_@"'

Or, if you have completion available (it is loaded by default):

$ compgen -A export MY_VAR_
MY_VAR_aa
MY_VAR_bb
MY_VAR_ss

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

add a comment |

up vote
4
down vote

As export of an already exported variable is no-op:

export "$!MY_VAR_@"

Will export all variables that start with MY_VAR_.

If you only want the list of exported variables that start with MY_VAR_:

env | grep '^MY_VAR_'

Or (calling an external program only keeps exported variables):

bash -c 'printf %s\n "$!MY_VAR_@"'

Or, if you have completion available (it is loaded by default):

$ compgen -A export MY_VAR_
MY_VAR_aa
MY_VAR_bb
MY_VAR_ss

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

As export of an already exported variable is no-op:

export "$!MY_VAR_@"

Will export all variables that start with MY_VAR_.

If you only want the list of exported variables that start with MY_VAR_:

env | grep '^MY_VAR_'

Or (calling an external program only keeps exported variables):

bash -c 'printf %s\n "$!MY_VAR_@"'

Or, if you have completion available (it is loaded by default):

$ compgen -A export MY_VAR_
MY_VAR_aa
MY_VAR_bb
MY_VAR_ss

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

edited Nov 21 at 5:02

answered Nov 20 at 17:23

Isaac

9,70411445

answered Nov 20 at 17:23

Isaac

9,70411445

answered Nov 20 at 17:23

Isaac

9,70411445

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

add a comment |

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

how about sh -c 'echo $!MY_VAR_@' for listing exported variables that start with MY_VAR_
– iruvar
Nov 21 at 4:48

@iruvar That will only work if sh is linked to bash and better that you quote the expansion of the variable: bash -c 'printf %s\n "$!MY_VAR_@"'.
– Isaac
Nov 21 at 4:58

add a comment |

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