While troubleshooting intermittent "Too many open files" errors, you need to check the exact soft and hard RLIMIT_NOFILE values that an already-running process with PID 2558 inherited. Which command will show you those limits immediately without modifying the process?
ulimit -a
sysctl fs.file-max
lsof -p 2558 | wc -l
cat /proc/2558/limits
Reading the pseudo-file /proc/
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