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Running a command repeatedly with different environment

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0

Let's say I want to run the process foo with different variables set, like:

FOO=1 foo

FOO=2 foo

FOO=1 BAR=7 foo

How can do do this without repeating the foo command repeatedly? E.g., by looping over the environment to set, like:

for e in 'FOO=1' 'FOO=2' 'FOO=1 BAR=7'; do

  env "$e" foo

done

That almost works, except in the case with $e equal to FOO=1 BAR=1, FOO gets set to 1 BAR=1 and BAR doesn't get set at all because env sees a single argument. I could use env $e, i.e., without quoting e - but then it doesn't work if the variable values have spaces.

bash environment-variables

share|improve this question

edited 18 mins ago

icarus

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asked 38 mins ago

BeeOnRopeBeeOnRope

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add a comment | 

0

Let's say I want to run the process foo with different variables set, like:

FOO=1 foo

FOO=2 foo

FOO=1 BAR=7 foo

How can do do this without repeating the foo command repeatedly? E.g., by looping over the environment to set, like:

for e in 'FOO=1' 'FOO=2' 'FOO=1 BAR=7'; do

  env "$e" foo

done

That almost works, except in the case with $e equal to FOO=1 BAR=1, FOO gets set to 1 BAR=1 and BAR doesn't get set at all because env sees a single argument. I could use env $e, i.e., without quoting e - but then it doesn't work if the variable values have spaces.

bash environment-variables

share|improve this question

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

25911 silver badge1111 bronze badges

add a comment | 

Let's say I want to run the process foo with different variables set, like:

FOO=1 foo

FOO=2 foo

FOO=1 BAR=7 foo

How can do do this without repeating the foo command repeatedly? E.g., by looping over the environment to set, like:

for e in 'FOO=1' 'FOO=2' 'FOO=1 BAR=7'; do

  env "$e" foo

done

That almost works, except in the case with $e equal to FOO=1 BAR=1, FOO gets set to 1 BAR=1 and BAR doesn't get set at all because env sees a single argument. I could use env $e, i.e., without quoting e - but then it doesn't work if the variable values have spaces.

bash environment-variables

share|improve this question

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

25911 silver badge1111 bronze badges

FOO=1 foo

FOO=2 foo

FOO=1 BAR=7 foo

for e in 'FOO=1' 'FOO=2' 'FOO=1 BAR=7'; do

  env "$e" foo

done

share|improve this question

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

25911 silver badge1111 bronze badges

share|improve this question

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

25911 silver badge1111 bronze badges

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

edited 18 mins ago

icarus

6,90611 gold badge1616 silver badges3333 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

25911 silver badge1111 bronze badges

asked 38 mins ago

BeeOnRopeBeeOnRope

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1 Answer
1

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oldest

votes

0

You are not going to get much shorter. If the issue is that the command you want to run is long, you might write a helper function, e.g.

r(){ env "$@" foo with lots of args ; }

r FOO=1

r FOO=2

r FOO=1 BAR=7

r FOO='1 BAR=7'

If there is a character you know is not going to be in either the names or the values of the environment variables you could use this to split, or you can attempt to quote the values correctly and use eval.

The question is why do you want to do this?

share

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The question is why do you want to do this? To avoiding the repeating the foo command (which is much more complex than just foo). Also to allow the possibility of having tested loops, e.g. 5 possible environments in one list, and 3 in another, and then nested loops to try all 5*3=15 combinations.
  
  – BeeOnRope
  3 mins ago
  

  
  
  
  

add a comment | 

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0

You are not going to get much shorter. If the issue is that the command you want to run is long, you might write a helper function, e.g.

r(){ env "$@" foo with lots of args ; }

r FOO=1

r FOO=2

r FOO=1 BAR=7

r FOO='1 BAR=7'

If there is a character you know is not going to be in either the names or the values of the environment variables you could use this to split, or you can attempt to quote the values correctly and use eval.

The question is why do you want to do this?

share

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The question is why do you want to do this? To avoiding the repeating the foo command (which is much more complex than just foo). Also to allow the possibility of having tested loops, e.g. 5 possible environments in one list, and 3 in another, and then nested loops to try all 5*3=15 combinations.
  
  – BeeOnRope
  3 mins ago
  

  
  
  
  

add a comment | 

0

You are not going to get much shorter. If the issue is that the command you want to run is long, you might write a helper function, e.g.

r(){ env "$@" foo with lots of args ; }

r FOO=1

r FOO=2

r FOO=1 BAR=7

r FOO='1 BAR=7'

If there is a character you know is not going to be in either the names or the values of the environment variables you could use this to split, or you can attempt to quote the values correctly and use eval.

The question is why do you want to do this?

share

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The question is why do you want to do this? To avoiding the repeating the foo command (which is much more complex than just foo). Also to allow the possibility of having tested loops, e.g. 5 possible environments in one list, and 3 in another, and then nested loops to try all 5*3=15 combinations.
  
  – BeeOnRope
  3 mins ago
  

  
  
  
  

add a comment | 

You are not going to get much shorter. If the issue is that the command you want to run is long, you might write a helper function, e.g.

r(){ env "$@" foo with lots of args ; }

r FOO=1

r FOO=2

r FOO=1 BAR=7

r FOO='1 BAR=7'

If there is a character you know is not going to be in either the names or the values of the environment variables you could use this to split, or you can attempt to quote the values correctly and use eval.

The question is why do you want to do this?

share

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

r(){ env "$@" foo with lots of args ; }

r FOO=1

r FOO=2

r FOO=1 BAR=7

r FOO='1 BAR=7'

share

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges

answered 7 mins ago

icarusicarus

6,90611 gold badge1616 silver badges3333 bronze badges