Shell - wait for keypress to continue

read -p "Press any key to continue..."

Vim - search and replace in multiple files

You can use :argdo command once you have opened multiple files using for example vim -p file1 file2 etc. Example:

:argdo %s/text_to_replace/new_text/gc

Pipe comand output to scp

If you want to pipe the shell command output to scp, eg. output of ls, you can use the following example:

scp $(ls -1 *.txt | head -1000) user@host:directory