I'm using Postgres 9.5 on Ubuntu 14.04. Even after using Postgres for a year, I can't get used to typing
\q to exit my command line session. My fingers just want to type "exit" or "quit". How can I create an alias that does the same thing as
\q in my Postgres command line session?
readline returns the text of the line read. A blank line returns the empty string. If EOF is encountered while reading a line, and the line is empty, NULL is returned. If an EOF is read with a non-empty line, it is treated as a newline.
Most of the interactive terminals and REPL utilities you use, use some variation of readline or libedit. They all run in a loop that process lines. When you type CTRL+D your terminal inserts the EOF signal, the loops get a null pointer, and the program reads that by convention as a desire to quit.
You can't make
quit an alias in psql, because psql doesn't have aliases like bash; but, both of your other utilities that use
quit should work with CTRL+D. It's a good muscle memory to develop.
Two minor footnotes...
- If you're on DOS or the newer graphical version, use CTRL+Z to send
EOF. That's also the MS Word hotkey for Undo.
- I'm not actually describing what happens in UNIX either. I'm keeping it simple. CTRL+D really sends
End-of-Transmission (EOT)which causes the terminal to send