Bash shell read error: 0: Resource temporarily unavailable

Question

When writing a bash script. Sometimes you are running a command which opens up another program such as npm, composer.. etc. But at the same time you need to use read

Answer 1

I had a similar issue, but the command I was running did need a real STDIN, /dev/null wasn't good enough. Instead, I was able to do:

TTY=$(/usr/bin/tty)
cmd-using-stdin < $TTY
read -r var

or combined with spbnick's answer:

TTY=$(/usr/bin/tty)
exec 3<&0 < $TTY
cmd-using-stdin
read -r var 0<&3`

which leaves a clean STDIN in 3 for you to read and 0 becomes a fresh stream from the terminal for the command.