If yo go through the fill article you will be able to make a difference between these two commands. Leave a comment for any queries. August 10, August 24, August 8, August 24, August 7, August 24, Like Article.
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Also see About the output fields of the ps command in Unix. For more, see Determine your current working directory in Unix. This command will remove destroy a file. You should enter this command with the -i option, so that you'll be asked to confirm each file deletion. To remove a file named junk , enter:. Note: Using rm will remove a file permanently, so be sure you really want to delete a file before you use rm.
To remove a non-empty subdirectory, rm accepts the -r option. On most systems this will prompt you to confirm the removal of each file. This behavior can be prevented by adding the -f option. To remove an entire subdirectory named oldstuff and all of its contents, enter:. Note: Using this command will cause rm to descend into each subdirectory within the specified subdirectory and remove all files without prompting you.
Use this command with caution, as it is very easy to accidently delete important files. As a precaution, use the ls command to list the files within the subdirectory you wish to remove. To browse through a subdirectory named oldstuff , enter:. This command will remove a subdirectory. To remove a subdirectory named oldstuff , enter:. Note: The directory you specify for removal must be empty. To clean it out, switch to the directory and use the ls and rm commands to inspect and delete files.
This command displays or changes various settings and options associated with your Unix session. If the output scrolls off your screen, combine set with less :.
The syntax used for changing settings is different for the various kinds of Unix shells; see the man entries for set and the references listed at the end of this document for more information. This command starts the vi text editor. To edit a file named myfile in the current directory, enter:. The vi editor works fairly differently from other text editors.
If you have not used it before, you should probably look at a tutorial, such as Use the vi text editor. The very least you need to know to start using vi is that in order to enter text, you need to switch the program from command mode to insert mode by pressing i.
To navigate around the document with the cursor keys, you must switch back to command mode by pressing Esc. To execute any of the following commands, you must switch from command mode to ex mode by pressing : the colon key : Enter w to save; wq to save and quit; q! The w and who commands are similar programs that list all users logged into the computer. If you use w , you also get a list of what they are doing.
If you use who , you also get the IP numbers or computer names of the terminals they are using.
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