Python and Bash: how to automate user input?

Question

I downloaded some scripts in both python and bash that prompt the user for command line input. Since I run these scripts often, I would like to automatically supply the input to the programs. I prefer not to modify the scripts. Is there a way to do it without modifying the original code?

[UPDATE] thanks to EnabrenTane's advice, it seems to work pretty well, until I got to a line that read password = getpass.getpass('password: '). It complains the following:

File "/usr/lib/python2.4/getpass.py", line 29, in unix_getpass
old = termios.tcgetattr(fd)     # a copy to save
termios.error: (25, 'Inappropriate ioctl for device')

Any way to get around that?

kindall: because of the first advice @ linuxquestions.org/questions/programming-9/… — PJx
– PJx, Commented Nov 4, 2011 at 22:24

Matvey Aksenov · Accepted Answer · 2011-11-08 09:54:56Z

3

Like this on bash: $ ./python_script < input.txt

edit: Alternatively you could write your scripts to take ARGV as a file name to read from. You could reopen STDIN to the file and not have to change any other lines.

edited Nov 8, 2011 at 9:54

Matvey Aksenov

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answered Nov 4, 2011 at 21:58

EnabrenTane

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Raymond Hettinger · Accepted Answer · 2011-11-04 21:59:39Z

1

Since the responses in via stdin:

cat answers | yourscript.py

answered Nov 4, 2011 at 21:59

Raymond Hettinger

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PJx · Accepted Answer · 2011-11-07 21:28:48Z

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Due to the password requirement, I ended up using pexpect, a python module that automates user input.

answered Nov 7, 2011 at 21:28

PJx

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