保持脚本一直运行中

script_keeper.sh

#!/bin/bash

# * * * * * /home/ryan/bin/script_keeper.sh

APP_BIN="/usr/bin/python"
APP_FILE="/home/ryan/tools/remove_vod_files.py"
PROGS=(
    "asc"
    "desc"
)

PROC_ID=""
PROC_ID_LIST=""

get_concat_name() {
    echo "$*" | tr ' ' '-'
}

grep_process_pids() {
    local params="$*"
    local app_file="$APP_FILE $params"
    PROC_ID_LIST=`ps -efww | grep "$app_file" | grep -v grep | cut -c 9-15 | xargs`
    if [ -z "$PROC_ID_LIST" ]; then
        echo "Process $params is not running"
    fi
}

start_server() {
    local params="$*"
    local name=$(get_concat_name $params)
    local app_file="$APP_FILE $params"
    $APP_BIN $app_file > /dev/null 2>&1 &
    echo "$params starting"
}

stop_server() {
    local params="$*"
    grep_process_pids $params
    if [ ! x"$PROC_ID_LIST" = x ]; then
        kill -9 $PROC_ID_LIST
    fi
    echo "$params closed"
}

keep_server_running() {
    local params="$*"
    grep_process_pids $params
    if [ x"$PROC_ID_LIST" = x ]; then
        start_server $params
    fi
}


case "$1" in
    start)
        for name in "${PROGS[@]}" ; do
            start_server $name
        done
        ;;
    stop)
        for name in "${PROGS[@]}" ; do
            stop_server $name
        done
        ;;
    restart | reload)
        for name in "${PROGS[@]}" ; do
            stop_server $name
            start_server $name
        done
        ;;
    forever)
        for i in {1..12}; do
            for name in "${PROGS[@]}" ; do
                keep_server_running $name
            done
            sleep 5
        done
        ;;
    *)
        for name in "${PROGS[@]}" ; do
            keep_server_running $name
        done
esac