Email Bash Script

Question

I'm having a problem with my script,

it's a notifier that emails me on a specific set of time then includes a statement if the file exceeds 100kb

Here is my script, how can i configure this so that it will send me the notification?

#!/bin/bash

file="afile"
maxsize=100

while true; do

        actualsize=$(du -k "$file" | cut -f1)

        if [ $actualsize -ge $maxsize ]
        then
                echo size is over $maxsize kilobytes
                subject="size exceed on file $file"
                emailAddr="[email protected]"
                emailCmd="mail -s \"$exceedfile\" \"$emvpacifico\""
        (echo ""; echo "date: $(date)";) | eval mail -s "$exceedfile" \"[email protected]\"
                exit
        else
                echo size is under $maxsize kilobytes
        fi

        sleep 60
done

I was going to fix the formatting, but it seems I can’t edit it. Good luck! — Stan Strum
– Stan Strum, Commented Apr 9, 2018 at 21:29
Are the lines starting with emailCmd and (echo "" supposed to be the same logical line, or are they separate statements? — RonJohn
– RonJohn, Commented Apr 9, 2018 at 21:33
drop eval and remove the backslashes from the recipient address. — glenn jackman
– glenn jackman, Commented Apr 9, 2018 at 21:58
paste your code into shellcheck.net to fix the other issues. — glenn jackman
– glenn jackman, Commented Apr 9, 2018 at 21:58

DopeGhoti · Accepted Answer · 2018-04-09 22:20:18Z

A quick rewrite, with comments inline:

#!/bin/bash

file="afile"
maxsize=100

while true; do
   # Use `stat`, the tool for getting file metadata, rather than `du`
   # and chewing on its output.  It gives size in bytes, so divide by
   # 1024 for kilobytes.
   actualsize=$(($(stat --printf="%s" "$file")/1024))
      if [[ $actualsize -ge $maxsize ]]; then
         echo "size is over $maxsize kilobytes"
         subject="size exceed on file $file"
         emailAddr="[email protected]"
         # In almost all cases, if you are using `eval`, either
         # something has gone very wrong, or you are doing a thing in
         # a _very_ suboptimal way.
         echo "Date: $(date)" | mail -s "$subject" "$emailAddr"
      else
         echo "size is under $maxsize kilobytes"
      fi
   sleep 60
done

Also, I would suggest rather than running a script with an infinite loop, altering the script to run only once, and scheduling it to run using a cron table entry.

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