Johnathon64 Johnathon64 - 7 months ago 28
Bash Question

executing python script using bash

I have tried to execute a bash start stop script however I am getting and error


nohup: failed to run command `python2.7
/home/shopStart.py': No such file or directory


I am trying to follow this post shell start / stop for python script but have changed the start command to execute python2.7

/home/shopStart.py


Here is my code:

#!/bin/bash

script_home="/home"
script_name="$script_home/shopStart.py"
pid_file="$script_home/shoppid.pid"

# returns a boolean and optionally the pid
running() {
local status=false
if [[ -f $pid_file ]]; then
# check to see it corresponds to the running script
local pid=$(< "$pid_file")
local cmdline=/proc/$pid/cmdline
# you may need to adjust the regexp in the grep command
if [[ -f $cmdline ]] && grep -q "$script_name" $cmdline; then
status="true $pid"
fi
fi
echo $status
}

start() {
echo "starting $script_name"
nohup "python $script_name" &
echo $! > "$pid_file"
}

stop() {
# `kill -0 pid` returns successfully if the pid is running, but does not
# actually kill it.
kill -0 $1 && kill $1
rm "$pid_file"
echo "stopped"
}

read running pid < <(running)

case $1 in
start)
if $running; then
echo "$script_name is already running with PID $pid"
else
start
fi
;;
stop)
stop $pid
;;
restart)
stop $pid
start
;;
status)
if $running; then
echo "$script_name is running with PID $pid"
else
echo "$script_name is not running"
fi
;;
*) echo "usage: $0 <start|stop|restart|status>"
exit
;;
esac

Answer

Put python command outside the quotes.

Make nohup "python $script_name" & as:

nohup python "$script_name" &

Otherwise the expansion of "python $script_name" will be treated as the argument file path of nohup.

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