How can my shell script determine whether it's in a real shell or not?

问题

I have a shell script that runs in my personal terminal and in a CI environment. In the CI environment, the python calls for determining shell height/width return funny values.

I would like to do something to the effect of:

if (I am running in shell context)
    determine height/width of terminal
else
    don't
fi

How can I express this condition, in a bash script?

回答1:

Check if standard input is a tty device.

In sh/bash:

if [ -t 0 ]; then

In Python:

if os.isatty(sys.stdin):

来源：https://stackoverflow.com/questions/5488180/how-can-my-shell-script-determine-whether-its-in-a-real-shell-or-not