how can I write a command line answer

[koeicjm]

how can I write a command line answer, for example if I want to make a script to input a password for a user,
just like this "passwd pgsql" , but I want to write the password in the script .

 

[koeicjm]

I means how can I input the y y in shell script , not input
by user
$ createuser talky2
Shall the new user be allowed to create databases? (y/n) y
Shall the new user be allowed to create more new users? (y/n) y

 

[dchoulette]

This should work for your example:

$ createuser talky2 <<EOF
y
y
EOF

Using this method you must specify ALL input needed by the command. If the command

createuser

read more than two answers all answers following the two 'y' will be empty.

 

[tdatgod]

Hi,
YES is a program which will echo by default a 'y' everytime there is a READ pending.

so you could do.....


yes | createuser talky2

if you want something other than a 'y' echo you can say....

yes 'd'

and it will echo a d. If you need to echo more than a single reply than I suggest you use the << EOF method described above.

 

[koeicjm]

But it can not run .

#passwd chen<<EOF
password
password
EOF

 

[tdatgod]

Hi,
It is possible that passwd doesn't read from STDIN for security reasons. It is possible that it opens it own IO stream.

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