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) Click the Research button in the Proofing group to display the Research task pane Enter the key words in the Search for box in the task pane, and then click the Start searching button Hold down the Alt key and click anywhere within the document The last service used will display results for the word you clicked For example, if the last service you accessed was Thesaurus, then the Thesaurus options will display in the Research task pane When the Research task pane is displayed, the Research button in the Proofing group will have an orange fill color To close the Research task pane, click the close button in the upper-right corner of the Research task pane, or click the Research button in the Proofing group.

3 12:32 still logged in 3 14:25 - 14:26 (00:01) 3 12:31 (4+05:40)

The WithMergeOptions operator allows you to tell PLINQ how you want results to be merged when processing is complete. PLINQ is not guaranteed to do this, though. WithMergeOptions operates in three modes: NotBuffered: Results are returned sooner, but slower overall. FullyBuffered: Quickest option but results are returned slowest. AutoBuffered: Chunks items returned and offers a middle ground between the other two options.

As you can see, the last command tells you that root is logged into tty1 and is still logged in. The list also shows the user bob, who logged in from the IP address 192.168.0.23 and stayed logged on for one second. The last entry shows a reboot entry. Every time the system is rebooted, an entry is logged to the wtmp file, giving the time of the reboot and the version of the kernel into which the system was booted. The lastb produces the same style of report but lists only those logins that were bad. In other words, it lists those logins in which an incorrect password was entered, or some other error resulted in a failure to log in. Both the last and lastb commands have some additional command-line options you can use. Table 1-11 shows these additional options. Table 1-11. Additional last and lastb Command-Line Options

Lists num of lines in the output Displays the login status at the time specified Displays the shutdown and run level changes Specifies another file to read for the last information

Related to the last and lastb commands is the lastlog command. The lastlog command displays a report that is based on information in the /var/log/lastlog file that shows the login status of all users on your system including those users who have never logged in. Like the wtmp and btmp files, you may need to create the lastlog file. puppy# touch /var/log/lastlog puppy# chown root:root /var/log/lastlog puppy# chmod 0644 /var/log/lastlog This displays a list of all users and their last login date and time. Or it displays a message indicating **Never Logged In** if that user has never logged in. You can also specify only the lastlog record for a particular user by using the -u command-line option. Or you can use the -t days option to specify only those logins more recent than days be displayed. Using the -t flag overrides the use of the -u flag. puppy# lastlog -u bob puppy# lastlog -t 30

Sometimes the overhead of parallelizing a query can actually make it perform more slowly than if it was run sequentially, so be sure to measure your queries performance. LINQ queries are not actually executed until you enumerate through them (deferred execution), so measuring performance can be slightly harder. Thus if you want to measure the performance, be sure to iterate through the data in the result set or call a method such as ToList.

s Many systems also come with the ac command that provides statistics about the amount of time users Tip

have been connected to your system, which can often provide useful information. The ac command uses the contents of the /var/log/wtmp file to produce these reports; you can see its options in the sa man page.