Use subprocess in python to echo a variable
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I have a variable in python, and I'm trying to open a subprocess and echo the variable, then create a file with the variable in it.
I tried this:
subprocess.Popen(['echo "$var" > file.txt'], shell=True)
It creates the file, but it's empty. How can I get the result that I want?
linux shell-script python echo
edited 12 mins ago
mrc02_kr
1,037320
asked 2 hours ago
david
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up vote
0
down vote
favorite
I have a variable in python, and I'm trying to open a subprocess and echo the variable, then create a file with the variable in it.
I tried this:
subprocess.Popen(['echo "$var" > file.txt'], shell=True)
It creates the file, but it's empty. How can I get the result that I want?
linux shell-script python echo
edited 12 mins ago
mrc02_kr
1,037320
asked 2 hours ago
david
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a variable in python, and I'm trying to open a subprocess and echo the variable, then create a file with the variable in it.
I tried this:
subprocess.Popen(['echo "$var" > file.txt'], shell=True)
It creates the file, but it's empty. How can I get the result that I want?
linux shell-script python echo
edited 12 mins ago
mrc02_kr
1,037320
asked 2 hours ago
david
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a variable in python, and I'm trying to open a subprocess and echo the variable, then create a file with the variable in it.
I tried this:
subprocess.Popen(['echo "$var" > file.txt'], shell=True)
It creates the file, but it's empty. How can I get the result that I want?
linux shell-script python echo
linux shell-script python echo
edited 12 mins ago
mrc02_kr
1,037320
asked 2 hours ago
david
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 12 mins ago
mrc02_kr
1,037320
asked 2 hours ago
david
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 12 mins ago
mrc02_kr
1,037320
edited 12 mins ago
mrc02_kr
1,037320
edited 12 mins ago
mrc02_kr
1,037320
1,037320
asked 2 hours ago
david
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
david
1
asked 2 hours ago
david
1
1
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
david is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago
add a comment |Â
1
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago
1
1
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago
add a comment |Â
1 Answer
1
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oldest
votes
up vote
0
down vote
In Python you don't use $ sign to use a variable. Also when you want to embed variable into string, you cannot just simply use variable name in string. You should do something like that:
subprocess.Popen(['echo "" > file.txt'.format(var)], shell=True)
This is great website which will explain you how to use .format method.
answered 1 hour ago
mrc02_kr
1,037320
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
In Python you don't use $ sign to use a variable. Also when you want to embed variable into string, you cannot just simply use variable name in string. You should do something like that:
subprocess.Popen(['echo "" > file.txt'.format(var)], shell=True)
This is great website which will explain you how to use .format method.
answered 1 hour ago
mrc02_kr
1,037320
add a comment |Â
up vote
0
down vote
In Python you don't use $ sign to use a variable. Also when you want to embed variable into string, you cannot just simply use variable name in string. You should do something like that:
subprocess.Popen(['echo "" > file.txt'.format(var)], shell=True)
This is great website which will explain you how to use .format method.
answered 1 hour ago
mrc02_kr
1,037320
add a comment |Â
up vote
0
down vote
up vote
0
down vote
In Python you don't use $ sign to use a variable. Also when you want to embed variable into string, you cannot just simply use variable name in string. You should do something like that:
subprocess.Popen(['echo "" > file.txt'.format(var)], shell=True)
This is great website which will explain you how to use .format method.
answered 1 hour ago
mrc02_kr
1,037320
In Python you don't use $ sign to use a variable. Also when you want to embed variable into string, you cannot just simply use variable name in string. You should do something like that:
subprocess.Popen(['echo "" > file.txt'.format(var)], shell=True)
This is great website which will explain you how to use .format method.
answered 1 hour ago
mrc02_kr
1,037320
answered 1 hour ago
mrc02_kr
1,037320
answered 1 hour ago
mrc02_kr
1,037320
answered 1 hour ago
mrc02_kr
1,037320
1,037320
add a comment |Â
add a comment |Â
david is a new contributor. Be nice, and check out our Code of Conduct.
david is a new contributor. Be nice, and check out our Code of Conduct.
david is a new contributor. Be nice, and check out our Code of Conduct.
david is a new contributor. Be nice, and check out our Code of Conduct.
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1
Not sure of your use case, but it might be easier and more robust to open the file, format the variable appropriately into a string, and write the string to the file.
– Mark Plotnick
1 hour ago