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You define your variable MYVAR with the desired search pattern:
...which can then be searched with the find command.
This is useful if you in a script, where you want the arguments to be fed into the find command.
The provided search is case insensitive (-iname) and will find all files and directories with the pattern MYVAR (not exact matches). This may go without saying, but if you want exact matches remove the \* and if you want case sensitive, use the -name argument.
The following will take frames starting at 15.2 seconds for a total of 45.9 seconds:
mencoder -ss 15.2 -endpos 30.7 -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi
Keep in mind -endpos is the total time, i.e. the output video in this is 3 minutes 3 seconds in length:
mencoder -ss 1 minute -endpos 2 minutes 3 seconds -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi
Use date to find the date at other days and times.
Other logs can be monitored similarly, e.g.
watch "tail -15 /var/log/daemon.log"