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I have log files in a folder. These files after some size are creating a new file old_name.log1 and writing to it.

Now there are many files and I can't clear them one by one. I want to delete old_name.log1, old_name.log2 etc and clear old_name.log.

The file_name can be anything. But the file ends with .log and it's extended files ends with .log1, .log2, etc. How to do it?

To delete .log1, .log2, etc. files:

rm *.log[1-9]*

• 
  rm - Delete files


• 
  *.log[1-9]* - All files in the current directory that contain .log followed by a digit 1-9 then anything else

To test the command before running it, replace the rm with echo. It will print the matching files.

To truncate .log files:

echo -n | tee *.log

• 
  echo -n - Print nothing


• 
  tee *.log - Write from stdin to all .log files in the current directory

Note that OP apparently wants to truncate files. In such case, the desired command is

find /path/to/dir -regextype sed -regex ".*.log[1-9]*" -exec truncate -s 0 {} ;

Alternatively, in bash

shopt -s globstar

truncate -s 0 **/*.log[1-9]

If you want to clear out any file that has .log in the name

find /path/to/dir -name "*.log*"

If you target .log[digit] specifically, use

find /path/to/dir -regextype sed -regex ".*.log[1-9]*"

Once you verify either of these two commands find the files you want, append -delete to the command for actual removal

Quick and dirty... assuming that you have permissions for these log files and directory itself... and you wish to delete the .log* files...

1. in a Files window, open the directory where the log files are located


2. search for .log files


3. 
   Select All, control-click any files to exclude (like the active and open *.log)


4. then Move to Trash
   

Note: if you wish to "clear" the .log file, close the application that makes the current .log file, then delete the current .log file with Move to Trash, and then right-click in the folder, select New Document, then Blank Document, and Rename... using the correct .log filename.