Can you please tell me the meaning of this

find /backup/logs/ -name daily_backup* -mtime +21 -exec rm -f {} ;


find /backup/logs/daily_backup* -mtime +5 -exec rm -f {} \;


find /backup/logs/daily_backup* -mtime +5 -delete;

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find /backup/logs/ -name daily_backup* -mtime +21 -exec rm -f {} ;

Find files in  /backup/logs/ directory with name daily_backup* (any characters or nothing after backup) that are more that 21 days old and remove them.
This command should have \; at the end or "{}" in quotations

find /backup/logs/daily_backup* -mtime +5 -exec rm -f {} \;
Find files in folders similar to /backup/logs/daily_backup* (anything after backup) that are more than 5 days old and remove them

find /backup/logs/daily_backup* -mtime +5 -delete;
Again find files more that 5 days old and delete them.

NOTE: mtime takes file's last modified time
* would mean 0 or more characters except for / that would mean next item in the path

For more examples, consult
find /backup/logs/ -name daily_backup* -mtime +21 -exec rm -f {} ;

This command has two problems:

1.  The syntax is incorrect as the trailing ; needs to be \;

2.  More importantly, it can cause an error if you invoke it in a directory that has files that start with "daily_backup" because the * is not quoted, shell globbing will be active.

For example, if you invoke the find command and you have the files


then the shell effectively changes that to

find /backup/logs/ -name daily_backup1 daily_backup2 ....

which is a syntax error.

The correct way is to do

find /backup/logs/ -name "daily_backup*" -exec rm -f {} \;

or to be extra safe, add -type f to only match files, i.e.:

find /backup/logs/ -type f -name "daily_backup*" -exec rm -f {} \;

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