Bash Script if a file exists and larger than loop

Question

*Note i edited this so my final functioning code is below Ok so I'm writing a bash script to backup our mysql database to a directory, delete the oldest backup if 10 exist, and output the results of the backup to a log so I can further create alerts if it fails. Everything works great except the if loop to output the results, thanks again for the help guys code is below! ``` #! /bin/bash #THis creates a variable with the date stamp to add to the filename now=$(date +"%m_%d_%y") #This moves the bash shell to the directory of the backups cd /dbbkp/backups/ #Counts the number of files in the direstory with the *.sql extension and deletes the oldest once 10 is reached. [[ $(ls -ltr *.sql | wc -l) -gt 10 ]] && rm $(ls -ltr *.sql | awk 'NR==1{print $NF}') #Moves the bash shell to the mysql bin directory to run the backup script cd /opt/GroupLink/everything_HelpDesk/mysql/bin/ #command to run and dump the mysql db to the directory ./mysqldump -u root -p dbname > /dbbkp/backups/ehdbkp_$now.sq…

Accepted Answer

To check if the file exists and larger than 51200 bytes you could rewrite your `if` like this:

```
if find ehdbkp_$now -type f -size +51200c 2>/dev/null | grep -q .; then
    echo "The backup has run successfully"
else
    echo "The backup has was unsuccessful"
fi >> /var/log/backups
```

Other notes:

- The `find` takes care two things at once: checks if file exists and size is greater than 51200.

- We redirect stderr to `/dev/null` to hide the error message if the file doesn't exist.

- If there was a file matching both conditions, then `grep` will match and exit with success, otherwise it will exit with failure

- The final outcome of the `grep` is what decides the `if` condition

- I moved the `>> /var/log/backups` after the closing `fi`, as it's equivalent this way and less duplication.

Btw `if` is NOT a loop, it's a conditional.

UPDATE

As @glennjackman pointed out, a better way to write the `if`, without `grep`:

```
if [[ $(find ehdbkp_$now -type f -size +51200c 2>/dev/null) ]]; then
...
```

Bash Script if a file exists and larger than loop

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