When my User logs in, I need to enter the following manually so I am trying to create a script to do it for me
. oraenv
The app asks me for input so I enter "M40" (same text every time)
Then I have to run a linux app to launch my work environment.
So how do I automatically enter M40 followed by an enter key
The oraenv script is prompting for a value for ORACLE_SID, so you can set that yourself in a .profile or elsewhere.
export ORACLE_SID=M40
It also has a flag you can set to make it non-interactive:
ORAENV_ASK=NO
Regarding piped input specifically, the script would have to be written to handle it, for example using read or commands such as cat without a filename. See Pipe input into a script for more details. However, this is not how the standard oraenv is coded (assuming that is the script you are using).
I am not sure if anyone of these operations helps you.
echo M40 | . oraenv
This one uses echo pipe.
printf M40 | . oraenv
This one uses printf for pipe. Using echo is different from using printf in some situations, however I don't know their actual difference.
. oraenv <<< M40
This one uses Here String (Sorry for using ABS as reference), a stripped-down form of Heredoc.
. oraenv < <(echo M40)
This one uses Process Substitution, you may see https://superuser.com/questions/1059781/what-exactly-is-in-bash-and-in-zsh for the difference between this one and the above one.
expect -c "spawn . oraenv; expect \"nput\"; send \"M40\r\n\"; interact"
This one uses expect to do automatic input, it has more extensibility in many situations. Note to change the expect \"nput\" part with your actual situation.
