pipes - Inserting pipe to middle of string [duplicate]

I don't think you want to do what you're asking to do. If all you want is the output of one command used as the argument of another command, then structures like $(...) or `...` are your friend. For example:

sudo python ~/testsite/manage.py runserver $(hostname -I):80 

Note that this is NOT what you asked for, but it does what you want.

If you really want stdin (a pipe) to be used as an argument, you may be able to use xargs(1) or a quick while loop in your shell.

This puts stdin at the end of the line:

echo Hello | xargs echo "The word is:" 

or if you want to substitute something inside the line:

echo Hello | xargs -J % echo % is the word. 

But xargs can be tricky to use if you're not able to understand its (somewhat arcane) usage. The xargs command also varies from OS to OS; the -J option works in BSD and OSX, but not in some older Linux distros. I don't know what OS you are using.

A loop might be easier:

echo Hello | while read word; do echo "$word is the word."; done 

Or in your case:

hostname -I | while read ip; do sudo python ~/testsite/manage.py runserver ${ip}:80 done 

The loop only gets run once, but you can put together your command line a little more easily. YMMV.

I think you can use a dash which stands for the standard output from the previous command "hostname -I"

hostname -I | sudo python ~/testsite/manage.py runserver - 

If you want to cut ipv6:

hostname -I | some command to cut ipv6 |sudo python ~/testsite/manage.py runserver -