[Linux] 使用 bash shell 監測某個 daemon 的執行緒數量

 #!/bin/sh

# Define the process name

process_name=rsyslogd

# Get minimum number of threads from command line parameters

process_min_threads=$1

# Calculate number of threads for the given process name

num_threads=`ps -e -T -f | grep “${process_name}“ | grep -v “grep” | wc -l`

# Restart process when thread count is less than expected

if [ ${num_threads} -lt ${process_min_threads} ]; then

    echo “Need to restart ${process_name} since current thread num ${num_threads} is less than ${process_min_threads}“

fi

From:

https://ephrain.net/linux-%E4%BD%BF%E7%94%A8-bash-shell-%E7%9B%A3%E6%B8%AC%E6%9F%90%E5%80%8B-daemon-%E7%9A%84%E5%9F%B7%E8%A1%8C%E7%B7%92%E6%95%B8%E9%87%8F/