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How to pass input to a script from terminal?
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I have a python script that expects user input like this:
Instead of executing the program and inputting "John" I want to pass the input to it from the command line like $ python script.py < "John" but it doesn't work. Is there a way to achieve what I want?
linux bash python
edited 1 hour ago
Kamil Maciorowski
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a python script that expects user input like this:
Instead of executing the program and inputting "John" I want to pass the input to it from the command line like $ python script.py < "John" but it doesn't work. Is there a way to achieve what I want?
linux bash python
edited 1 hour ago
Kamil Maciorowski
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago
add a comment |
I have a python script that expects user input like this:
Instead of executing the program and inputting "John" I want to pass the input to it from the command line like $ python script.py < "John" but it doesn't work. Is there a way to achieve what I want?
linux bash python
edited 1 hour ago
Kamil Maciorowski
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b 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 python script that expects user input like this:
Instead of executing the program and inputting "John" I want to pass the input to it from the command line like $ python script.py < "John" but it doesn't work. Is there a way to achieve what I want?
linux bash python
linux bash python
edited 1 hour ago
Kamil Maciorowski
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 1 hour ago
Kamil Maciorowski
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 1 hour ago
Kamil Maciorowski
27.6k156084
edited 1 hour ago
Kamil Maciorowski
27.6k156084
edited 1 hour ago
Kamil Maciorowski
27.6k156084
27.6k156084
asked 3 hours ago
n00bn00b
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
n00bn00b
11
asked 3 hours ago
n00bn00b
11
11
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
n00b is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago
add a comment |
For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago
For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago
For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago
add a comment |
2 Answers
2
active
oldest
votes
A simple way is creating a script to input the information:
#!/usr/bin/expect
set cmd [lrange $argv 1 end]
set val [lindex $argv 0]
eval spawn $cmd
expect ":"
send "$valr";
interact
Save this file somwehere (eg ~/sendInput.sh)
and run sudo chmod +x ~/sendInput.sh to make the file executable
now run !/sendInput.sh "Jhon" python script.py
This should send the input "Jhon" to the script.py once the character ":" is sent.
(Adpated from https://srvfail.com/how-to-provide-ssh-password-inside-a-script-or-oneliner/)
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
add a comment |
If the script uses its stdin to read data, this line you used
python script.py < "John"
should work, except it tries to send the content of a file named John to the stdin of the script (and it will fail if there's no such file; I guess this happened to you). In Bash there's a way to send a string though, here string:
python script.py <<< "John"
A newline is appended automatically. Another way is
printf '%sn' "John" | python script.py
and this should work even in plain sh. There is also
echo "John" | python script.py
Note printf is in general better than echo, but with this fixed string both methods should work right.
Neither of the above will work if the script directly uses its controlling terminal (/dev/tty) instead of its stdin to read user's response. If so, expect (like in this other answer) will be useful. You didn't show us the script itself so it's impossible to tell for sure; you should know.
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
A simple way is creating a script to input the information:
#!/usr/bin/expect
set cmd [lrange $argv 1 end]
set val [lindex $argv 0]
eval spawn $cmd
expect ":"
send "$valr";
interact
Save this file somwehere (eg ~/sendInput.sh)
and run sudo chmod +x ~/sendInput.sh to make the file executable
now run !/sendInput.sh "Jhon" python script.py
This should send the input "Jhon" to the script.py once the character ":" is sent.
(Adpated from https://srvfail.com/how-to-provide-ssh-password-inside-a-script-or-oneliner/)
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
add a comment |
A simple way is creating a script to input the information:
#!/usr/bin/expect
set cmd [lrange $argv 1 end]
set val [lindex $argv 0]
eval spawn $cmd
expect ":"
send "$valr";
interact
Save this file somwehere (eg ~/sendInput.sh)
and run sudo chmod +x ~/sendInput.sh to make the file executable
now run !/sendInput.sh "Jhon" python script.py
This should send the input "Jhon" to the script.py once the character ":" is sent.
(Adpated from https://srvfail.com/how-to-provide-ssh-password-inside-a-script-or-oneliner/)
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
add a comment |
A simple way is creating a script to input the information:
#!/usr/bin/expect
set cmd [lrange $argv 1 end]
set val [lindex $argv 0]
eval spawn $cmd
expect ":"
send "$valr";
interact
Save this file somwehere (eg ~/sendInput.sh)
and run sudo chmod +x ~/sendInput.sh to make the file executable
now run !/sendInput.sh "Jhon" python script.py
This should send the input "Jhon" to the script.py once the character ":" is sent.
(Adpated from https://srvfail.com/how-to-provide-ssh-password-inside-a-script-or-oneliner/)
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
A simple way is creating a script to input the information:
#!/usr/bin/expect
set cmd [lrange $argv 1 end]
set val [lindex $argv 0]
eval spawn $cmd
expect ":"
send "$valr";
interact
Save this file somwehere (eg ~/sendInput.sh)
and run sudo chmod +x ~/sendInput.sh to make the file executable
now run !/sendInput.sh "Jhon" python script.py
This should send the input "Jhon" to the script.py once the character ":" is sent.
(Adpated from https://srvfail.com/how-to-provide-ssh-password-inside-a-script-or-oneliner/)
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
answered 3 hours ago
Arcane BlackwoodArcane Blackwood
33
33
add a comment |
add a comment |
If the script uses its stdin to read data, this line you used
python script.py < "John"
should work, except it tries to send the content of a file named John to the stdin of the script (and it will fail if there's no such file; I guess this happened to you). In Bash there's a way to send a string though, here string:
python script.py <<< "John"
A newline is appended automatically. Another way is
printf '%sn' "John" | python script.py
and this should work even in plain sh. There is also
echo "John" | python script.py
Note printf is in general better than echo, but with this fixed string both methods should work right.
Neither of the above will work if the script directly uses its controlling terminal (/dev/tty) instead of its stdin to read user's response. If so, expect (like in this other answer) will be useful. You didn't show us the script itself so it's impossible to tell for sure; you should know.
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
add a comment |
If the script uses its stdin to read data, this line you used
python script.py < "John"
should work, except it tries to send the content of a file named John to the stdin of the script (and it will fail if there's no such file; I guess this happened to you). In Bash there's a way to send a string though, here string:
python script.py <<< "John"
A newline is appended automatically. Another way is
printf '%sn' "John" | python script.py
and this should work even in plain sh. There is also
echo "John" | python script.py
Note printf is in general better than echo, but with this fixed string both methods should work right.
Neither of the above will work if the script directly uses its controlling terminal (/dev/tty) instead of its stdin to read user's response. If so, expect (like in this other answer) will be useful. You didn't show us the script itself so it's impossible to tell for sure; you should know.
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
add a comment |
If the script uses its stdin to read data, this line you used
python script.py < "John"
should work, except it tries to send the content of a file named John to the stdin of the script (and it will fail if there's no such file; I guess this happened to you). In Bash there's a way to send a string though, here string:
python script.py <<< "John"
A newline is appended automatically. Another way is
printf '%sn' "John" | python script.py
and this should work even in plain sh. There is also
echo "John" | python script.py
Note printf is in general better than echo, but with this fixed string both methods should work right.
Neither of the above will work if the script directly uses its controlling terminal (/dev/tty) instead of its stdin to read user's response. If so, expect (like in this other answer) will be useful. You didn't show us the script itself so it's impossible to tell for sure; you should know.
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
If the script uses its stdin to read data, this line you used
python script.py < "John"
should work, except it tries to send the content of a file named John to the stdin of the script (and it will fail if there's no such file; I guess this happened to you). In Bash there's a way to send a string though, here string:
python script.py <<< "John"
A newline is appended automatically. Another way is
printf '%sn' "John" | python script.py
and this should work even in plain sh. There is also
echo "John" | python script.py
Note printf is in general better than echo, but with this fixed string both methods should work right.
Neither of the above will work if the script directly uses its controlling terminal (/dev/tty) instead of its stdin to read user's response. If so, expect (like in this other answer) will be useful. You didn't show us the script itself so it's impossible to tell for sure; you should know.
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
27.6k156084
27.6k156084
add a comment |
add a comment |
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n00b is a new contributor. Be nice, and check out our Code of Conduct.
n00b is a new contributor. Be nice, and check out our Code of Conduct.
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For future reference: (1) Instead of "it doesn't work" you should post the specific error message you got. (2) Instead of this screenshot from execution you should post (the relevant part of) the actual code. The screenshot tells nothing about how the script "expects user input".
– Kamil Maciorowski
1 hour ago