These systems become more popular since low-cost hardware and the availability of a wide range of software to perform different tasks.

The kernel does not communicate directly with the user instead, it starts a separate interactive program called shell for each user when logged in to the system.Īnswer: A single-user system is a personal computer with an operating system, designed to operate by a single user at a given time. The resource allocation to different users and tasks is handled by this section. Will change the date by minus one year in the directory where you are.Best UNIX Interview Questions And AnswersĪnswer: Kernel is the master program that controls the resources of the computer. To use this file you would need to write it and chmod +x fn If you only want to update the file modification times relative to the present time, you can simplify this to: find DIRECTORY -exec touch -d '2 hours ago' ' You can change the arguments to find to select only the files you are interested in. Touch -d '$(date -R -r '$filename') - 2 hours' '$filename'

If you want to modify a large number of files, you could use the following: find DIRECTORY -print | while read filename do If you want to modify the file relative to its existing modification time instead, the following should do the trick: touch -d '$(date -R -r filename) - 2 hours' filename So for example, to set a file as being modified two hours before the present, you could use the following: touch -d '2 hours ago' filename As long as you are the owner of the file (or root), you can change the modification time of a file using the touch command: touch filenameīy default this will set the file's modification time to the current time, but there are a number of flags, such as the -d flag to pick a particular date.

C shell solaris find files by date