![启动时运行脚本困难](https://linux22.com/image/1152273/%E5%90%AF%E5%8A%A8%E6%97%B6%E8%BF%90%E8%A1%8C%E8%84%9A%E6%9C%AC%E5%9B%B0%E9%9A%BE.png)
我正在运行 Ubuntu 16.04,并连接了 USB CEC 适配器来控制我的电视。我使用的是修改版的这个脚本启动一个cec-server
接受并发送命令的程序。
因此,脚本可以正常工作;只要我在启动后手动运行它。当我发出时pidof cec-client
,它会给我一个 ID,我可以向发送命令,这些命令cec-server
会立即生效。这样一切都很棒。
但是,我似乎无法通过 crontab 或启动应用程序使其工作。pidof cec-client
不会返回 ID 并且我无法发送命令。
TL;DR:当我手动运行脚本时,它有效。通过 crontab 不起作用。希望在重启后自动运行它。
编辑:
我使用的 crontabline 是@reboot /home/server/Documents/cecserver.sh
脚本本身:
#!/bin/bash
#
# Set up a fifo and connect cec-client to it
#
# Original By Will Cooke. http://www.whizzy.org
CECLOG="/home/server/Documents/logs/cec.log"
CECDEV="/dev/ttyACM0"
CECFIFO="/home/server/Documents/logs/cec.fifo"
CECCLIENT="/usr/bin/cec-client -d 1 -p 1 -o Codex"
timestamp(){
date +"%Y-%m-%d %T"
}
log(){
echo "SERVER $(timestamp): $1" >> $CECLOG
}
echo "SERVER $(timestamp): File loaded ($1)" >> $CECLOG
log "Starting server. Since only one server can run at a time, stopping first."
log "Begin shutting down..."
declare -a TAILPIDS=(`ps aux | grep 'tail -f /dev/null' | egrep -v grep | awk '{print $2}'`)
declare -a CATPIDS=(`ps aux | grep 'cat $CECFIFO' | egrep -v grep | awk '{print $2}'`)
if [ ${#TAILPIDS[@]} -gt 0 ]
then
log "Found some tail processes..."
for i in "${TAILPIDS[@]}"
do
log "Killing $i"
kill $i
done
fi
if [ ${#CATPIDS[@]} -gt 0 ]
then
log "Found some cat processes..."
for i in "${CATPIDS[@]}"
do
log "Killing $i"
kill $i
done
fi
log "Asking cec-client to stop if it's running..."
killall -s 2 cec-client >> $CECLOG
log "Trying to remove FIFO..."
rm $CECFIFO >> $CECLOG
log "Done shutting down."
log "Done stopping, now starting..."
log "Setting up FIFOs..."
mkfifo $CECFIFO
log "Open pipe for writing..."
tail -f /dev/null > $CECFIFO &
log "Opening pipe for reading and start cec-client..."
(cat $CECFIFO | $CECCLIENT &) > /dev/null
log "Start up complete."
exit 0