How do I trim a log file?

How do I trim a log file?

Truncate the transaction log

1. Right-click the database and select Properties -> Options.
2. Set the recovery model to Simple and exit the menu.
3. Right-click the database again and select Tasks -> Shrink -> Files.
4. Change the type to Log .
5. Under Shrink action, select Reorganize pages before releasing unused space and click OK.

How do you remove the last 3 lines in Unix?

It’s a little roundabout, but I think it’s easy to follow.

1. Count up the number of lines in the main file.
2. Subtract the number of lines you want to remove from the count.
3. Print out the number of lines you want to keep and store in a temp file.
4. Replace the main file with the temp file.
5. Remove the temp file.

How do you make tail show the last 30 lines of a file?

To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.

Which command can be used to show only the last 10 lines of your history file?

Answer B is correct because the history command when piped through the tail command shows only the last 10 lines of your command history.

How to monitor only the last n lines of a log file?

Here is what I know I can do: As the log file is filled, tail appends the last lines to the display. I am looking for a solution that only displays the last 15 lines and get rid of the lines before the last 15 after it has been updated.

How to display the last lines of a file in Unix?

Display the last lines of a file in Unix Use the Unix command tail to read from standard input or a file and send the result to standard output (that is, your terminal screen). The format for using the tail command is: tail [ +- [number] [lbcr] ] [file]

How to delete last 50 lines in logfile?

The rest of the lines set up the math for sed’s operation, namely: count the lines in the file ( wc ), then subtract 50; assign that to n. if n is positive, run the sed command to delete lines 1 through n.

How to print the last line of a file?

Specifying -r causes tail to print lines from the end of the file in reverse order. The default for -r is to print the entire file this way. Specifying -f causes tail not to quit at the end of the file, but rather to reread the file repeatedly (useful for watching a “growing” file such as a log file).