В качестве параметра принимает имя процесса. Показывает кол-во файловых дескрипторов процесса с изменением во времени

lsfd.sh

#!/bin/bash

pid=$(pidof "${@}")

if [ -z "${pid}" ]; then
  echo "process was not found. exit"
  exit
fi

echo "${@} (pid ${pid})"

prev=0

max_files=$(cat /proc/${pid}/limits | grep "Max open files" | grep -oP "\d+")
max_soft=$(echo "${max_files}" | head -1)
max_hard=$(echo "${max_files}" | tail -n 1)

echo "Max: soft ${max_soft}; hard ${max_hard}"
#echo   "[2017-03-23 15:10:02] 10	+10"
echo -e "\nTIMESTAMP             CURRENT\t\tDIFF"
echo -e "---------------------------------------------"
while [ -d /proc/${pid} ]; do
  count=$(lsof -a -p $pid | wc -l)
  diff_symbol=$([[ $count -gt $prev ]] && echo -n "+" || echo -n "")
  diff=$(echo "$count-$prev" | bc)
  ts=$(date +%Y-%m-%d\ %H:\%M:%S)
  echo -en "\r[${ts}] ${count}\t\t${diff_symbol}${diff}               "
  if [[ "${diff}" -ne "0" ]]
    then echo
  fi
  prev=$count
  sleep 1
done

echo