In this article, we are going to discuss the syslog protocol. We’ll also learn about the
logger command, which is a shell command and acts as an interface for the syslog module. The
logger command makes entries in the system log. In this section, we are also going to create an alarm using a script.
Besides having a terminal open, we need to make sure you have a file to make an entry.
We are going to use the
logger command to enter
file_name into the
syslog file. Run the following command:
$ logger -f file_name
Now we are going to write a script to create an alarm. Create a
create_alarm.sh script and write the following code in it:
#!/bin/bash declare -i H declare -i M declare -i cur_H declare -i cur_M declare -i min_left declare -i hour_left echo -e "What time do you Wake Up?" read H echo -e "and Minutes?" read M cur_H=`date +%H` cur_M=`date +%M` echo "You Selected " echo "$H:$M" echo -e "\nIt is Currently $cur_H:$cur_M" if [ $cur_H -lt $H ]; then hour_left=`expr $H - $cur_H` echo "$H - $cur_H means You Have: $hour_left hours still" fi if [ $cur_H -gt $H ]; then hour_left=`expr $cur_H - $H` echo -e "\n$cur_H - $H means you have $hour_left hours left \n" fi if [ $cur_H == $H ]; then hour_left=0 echo -e "Taking a nap?\n" fi if [ $cur_M -lt $M ]; then min_left=`expr $M - $cur_M` echo -e "$M -$cur_M you have: $min_left minutes still" fi if [ $cur_M -gt $M ]; then min_left=`expr $cur_M - $M` echo -e "$cur_M - $M you have $min_left minutes left \n" fi if [ $cur_M == $M ]; then min_left=0 echo -e "and no minutes\n" fi echo -e "Sleeping for $hour_left hours and $min_left minutes \n" sleep $hour_left\h sleep $min_left\m mplayer ~/.alarm/alarm.mp3
How script works
Now we will see a description of the
logger command and the
create_alarm script we just wrote:
loggercommand made an entry about your file in the
syslogfile, which was in the
/var/logdirectory of your system. You can check that file. Navigate to the
/var/logdirectory and run
nano syslogand you will find the entry in that file.
- We created a script to create an alarm. We used the
datecommand for the date and time. We also used the
sleepcommand to block the alarm for that particular time.