Resource temporarily unavailable

EAGAIN on a shell usually means fork failed

The process table, a file descriptor limit, or memory ran out at the moment of the call.

ulimit -u
cat /proc/sys/kernel/threads-max
cat /proc/sys/kernel/pid_max

ulimit -n
ls /proc/$$/fd | wc -l

ls /proc/*/fd 2>/dev/null | wc -l
for p in /proc/[0-9]*; do echo "$(ls $p/fd 2>/dev/null | wc -l) $p"; done | sort -rn | head

Scope: failure mode: EAGAIN and fork failures.

CliHelper documents failure modes of third-party command line tools. No software is stored or distributed here.