Usage of diff and shutdown in Linux

In Linux, diff and shutdown usage command learning in Linux is both a key and a difficult point for many linux beginners. The following describes common commands in linux: diff and shutdown usage. I. diff command usage 1. diff-urNold /... in Linux, diff and shutdown usage command learning in Linux is both a key and a difficult point for many linux beginners. The following describes common commands in linux: diff and shutdown usage. I. diff command usage 1. diff-urN old/new/> mysoft. the patch parameter-u indicates that the uniied format is used, and-r indicates that the comparison directory is used.-N indicates that non-existing files are processed as empty files, so that newly added files will also appear in the patch file. Use the following command to apply the patch: patch-p0 <mysoft. patch 2. the diff-y command (the long format is-side-by-side) divides the screen into the left and right parts to compare the differences between the two files: the shutdown command can safely shut down or restart the Linux system. before the system is shut down, it prompts a warning message to all login users on the system. This command also allows you to specify a time parameter, which can be a precise time or a time period from now on. The exact time format is hh: mm, indicating the hour and minute, and the time period is represented by + and the number of minutes. The system automatically synchronizes data after executing this command. Note that this command can only be used by Super users. The definition of the options in the Shell code shutdown [option] [time] [warning information] command is as follows: -k does not actually shut down, but only sends a warning message to all users.-r immediately restarts after shutdown-h shutdown without restarting-f quick shutdown upon restart, skip fsck-n quick shutdown cancel a running shutdown instance 1 without going through init Program-c, the system shuts down in 10 minutes and immediately restarts the Shell code shutdown-r + 10 cases 2. the system immediately shuts down and does not restart the Shell code shutdown-h now