Need help to create a script

subby80 · 10-15-2019, 09:54 AM

Hi,
I need to create a small script which i want to run every night to check if a file is created in a certain directory. If a file is created i need an email message to warn me about it.

I can find the file like this

# find folder -mtime 0 -name "test*" | mail -s 'test' mailadress

But this also sends a message without body. I only want a mail if a file exists.

Thanks

TB0ne · 10-15-2019, 10:00 AM

Quote:

Originally Posted by subby80

Hi,
I need to create a small script which i want to run every night to check if a file is created in a certain directory. If a file is created i need an email message to warn me about it. I can find the file like this

# find folder -mtime 0 -name "test*" | mail -s 'test' mailadress

But this also sends a message without body. I only want a mail if a file exists.

Ok...so now that we know what you want, why don't you post what you have DONE to accomplish this?? Read the "Question Guidelines"...we're happy to help you, but we WILL NOT write your scripts for you. There are abundant tutorials available, along with samples/examples, to get you started, and you can find them with a brief Google search.

Post what you've written/done/tried (past the single-line above), and we'll be glad to help.

rtmistler · 10-15-2019, 10:30 AM

Please check the link in my signature for My Bash Blog. It discusses how to create and debug bash scripts and discusses the very most important detail, which is if you can type it in a command line, you can add it to a script and run it that way.

BW-userx · 10-15-2019, 10:45 AM

you're going to need to look more in depth to how conditionals work and relationship to variable checking for the ' if it is empty or not?'

Code:

[[ -n $(find folder -mtime 0 -name "test*") ]] && send  mail

https://www.cyberciti.biz/faq/unix-l...able-is-empty/

https://www.tldp.org/LDP/abs/html/comparison-ops.html

dugan · 10-15-2019, 11:59 AM

Have you thought about using an inotify-based program to watch for file creation, like inotifywatch, entr, or watchman?

ondoho · 10-17-2019, 03:09 AM

If it is only one particular file in a particular location, you do not need find.

Code:

test -e /path/to/file && mail -s ....

MadeInGermany · 10-18-2019, 12:15 AM

Store the find output in a variable. Then test the variable; if not empty then send mail with contents from the variable.

Code:

#!/bin/sh
out=$(find folder -mtime 0 -name "test*")
if [ -n "$out" ]
then
  echo "$out" | mail -s 'test'
fi

subby80 · 10-18-2019, 01:52 AM

Hi,

I did it al little bit different but it works:

Code:

t3=$(find folder -mtime 0 -name "*.txt")

if test -z "$t1"
then
      echo "\$t1 is empty"
else
       find find -mtime 0 -name "*.ERG" | mail -s 'error' Mailaddress
fi

BW-userx · 10-18-2019, 06:51 AM

seriously, subby80 didn't you notice that your code blocks did not work?

Use the edit button and use the square brackets [ ]

Any method will work

test condition then execute command(s) related to results of that test. causes and effects.

test are always seeking a true or false value but only act on the truth, else they throw an error, and they don't work.

ychaouche · 10-18-2019, 08:21 AM

Quote:

Originally Posted by ondoho

If it is only one particular file in a particular location, you do not need find.

Code:

test -e /path/to/file && mail -s ....

I +1 this.

BW-userx · 10-18-2019, 08:55 AM

Quote:

Originally Posted by ychaouche

I +1 this.

same as

Code:

[ -e /path/to/file ] && do something

[[ -e /path/to/file ]] && do something

if [ -e /path/to/file ] ;
then
   do something
fi

if [[-e /path/to/file ]] ;
then
   do something
fi

File test operators

https://linuxize.com/post/bash-check-if-file-exists/
https://www.shellhacks.com/bash-test-if-file-exists/