Shell Programming and Scripting

Hi Guys,

I am having a driving script which calls internally multiple scripts

Code:

sh main_script.sh > main_script.log

inside main_script.sh

sh -x script_1.sh

sh -x script_2.sh

sh -x script_3.sh

I Have to run the internal scripts in partcular dates

script_1.sh - 25th of every month
script_2.sh - daily
script_3.sh - Every quaterly month end

Code:

Use cron/crontab!
Man pages:

Code:

man crontab

Month end cannot be specified in crontab. How about the 1st of each month?

I know its possible in crontab but can it be handled in script itslef like before trigerring each of the sub scripts

Yes, of course: there is the date command, which will tell you the current time and date. Use a format specifier to get the part of the date you want to base your condition on and use if... to conditionally run the script.

Example: run the script myscript only on 25th of the month (have a look at man date to understand what %d means):

Code:

if [ $(date '+%d') -eq 25 ] ; then
     myscript
fi

I hope this helps.

bakunin

what if script_1.sh fails then if i rerun the main_script.sh it should run only script_1.sh . For eg script_1.sh fails on 25th and re-running on 26th in that case script_1.sh will not run and other script_2.sh will also run which would have completed being daily job

I suggest reading up on the test- command (this is effectively what [..] is). You have many possibilities to formulate various conditions on when and when not to run a script, you just need to implement them. It is far easier and in the long run less time-consuming for you to learn that (takes about 10 minutes) than to ask over and over again like you are doing now.

But first you should define what "script fails" means: does it exit with a non-zero return code? Does it write a log with an error message? Does it (not) produce a file? The secret of writing good scripts is to first make up your mind what exactly you want to do and under which conditions, then to define exactly what it is you want to do: "i need a file today" is less exact than "i need a file every second friday of the month" and this in turn is less exact than "i need a file every second friday only if this other file is up to date execpt for ....". Nobody here knows what you need as well as you do, so do your work first and we will gladly help with the rest.

I hope this helps.

bakunin

Here is what i am trying

Code:

current_day=$(date +%e)
current_time=$(date +"%H:%M")
current_month=$(date +"%m")

if [ $current_day == 25 ] && [ $current_time == '10:00' ]
      sh -x script_1.sh && break  
 fi

if [ $current_time == '10:00' ]
then
   sh -x script_2.sh
fi

if [ $current_month == 4 ] || [ $current_month == 8 ] || [ $current_month == 12 ]
then 
  if [ $current_day == 30 ] && [ $current_time == '10:00' ]
    then
      sh -x script_3.sh
  fi
fi

For instance if my script_1 fails on 25th and trying to re-run the main_script.sh on next day, then it should run only script_1.sh instead of script_2.sh because script_2.sh was already successful on 25th