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

Clearly (resource temporarily unavailable is EAGAIN) this is caused by programs that exits but leaves STDIN in nonblocking mode. Here is another solution (easiest to script?):

perl -MFcntl -e 'fcntl STDIN, F_SETFL, fcntl(STDIN, F_GETFL, 0) & ~O_NONBLOCK'