/usr/bin/env: ‘ruby’: No such file or directory

Question

When crontab tries to execute the script:

@reboot sh /home/username/unicorn_start.sh > /home/username/unicorn_start.out 2>&1

It creates me a log file with the following content: /usr/bin/env: ‘ruby’: No such file or directory.

This is what I have in unicorn_start.sh:

#!/bin/bash

PATH="$PATH:/usr/local/rvm/gems/ruby-1.9.2-p180/bin"

/etc/init.d/unicorn_myapp start

If I execute unicorn_myapp or unicorn_start.sh manually, everything works fine. As I understand, I need to add an additional path to $PATH variable. What is the way of doing it? Thanks ahead.

EDIT:

unicorn_init.sh:

#!/bin/sh
### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Manage unicorn server
# Description:       Start, stop, restart unicorn server for a specific application.
### END INIT INFO
set -e

# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/home/username/appname
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="cd $APP_ROOT; bundle exec unicorn -D -c $APP_ROOT/config/unicorn.rb -E production"
AS_USER=root
set -u

OLD_PIN="$PID.oldbin"

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
  test -s $OLD_PIN && kill -$1 `cat $OLD_PIN`
}

run () {
  if [ "$(id -un)" = "$AS_USER" ]; then
    eval $1
  else
    su -c "$1" - $AS_USER
  fi
}

case "$1" in
start)
  sig 0 && echo >&2 "Already running" && exit 0
  run "$CMD"
  ;;
stop)
  sig QUIT && exit 0
  echo >&2 "Not running"
  ;;
force-stop)
  sig TERM && exit 0
  echo >&2 "Not running"
  ;;
restart|reload)
  sig HUP && echo reloaded OK && exit 0
  echo >&2 "Couldn't reload, starting '$CMD' instead"
  run "$CMD"
  ;;
upgrade)
  if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
  then
    n=$TIMEOUT
    while test -s $OLD_PIN && test $n -ge 0
    do
      printf '.' && sleep 1 && n=$(( $n - 1 ))
    done
    echo

    if test $n -lt 0 && test -s $OLD_PIN
    then
      echo >&2 "$OLD_PIN still exists after $TIMEOUT seconds"
      exit 1
    fi
    exit 0
  fi
  echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  run "$CMD"
  ;;
reopen-logs)
  sig USR1
  ;;
*)
  echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
  exit 1
  ;;
esac

Answer 1

I faced same issue with following details

Ruby was installed on system

which ruby returned /usr/local/bin/ruby but if is try to run any script from cron it was throwing error /usr/bin/env: ‘ruby’: No such file or directory

A little investigation revealed that env was trying to load ruby binary form /usr/bin/ruby even though /usr/local/bin/ was in the $PATH env variable. So i created a soft link.

ln -s /usr/local/bin/ruby /usr/bin/ruby

Now scripts can work from cron as well.

Answer 2

The default PATH crontab is using is "only" /usr/bin:/bin, however you can adjust it.

Instead of writing the things in that script try adding it directly into the crontab command:

@reboot PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/rvm/gems/ruby-1.9.2-p180/bin"; /etc/init.d/unicorn_myapp start > /home/username/unicorn_start.out 2>&1

You can also add the path variable above every cronjob so it's applicable to every task you put in there:

 PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/rvm/gems/ruby-1.9.2-p180/bin"
 #
 #
 * * * * * myjob.sh
 @reboot /home/username/unicorn_start.sh > /home/username/unicorn_start.out 2>&1

Answer 3

If you use the which command you should be able to see where your ruby executable is located e.g

which ruby

/usr/bin/ruby

The you could add that path to the $PATH variable to straight to the crontab (not sure what best practice may dictate but has worked for me in the past)