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The f stands for force (that is, force the deletion). If you try to use the rm command to remove a directory, you ll see an error message. This is because the command needs an additional option:
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rm rf mydirectory
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As noted earlier, the r stands for recursive and indicates that any folder specified afterward should be deleted, in addition to any files it contains.
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Tip You might have used wildcards within Windows and DOS. They can be used within Ubuntu, too. For
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example, the asterisk (*) can be used to mean any file. So, you can type rm f * to delete all files within a directory, or type rm f myfile* to delete all files that start with the word myfile. But remember to be careful with the rm command. Keep in mind that you cannot salvage files easily if you accidentally delete them!
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WORKING WITH FILES WITH SPACES IN THEM
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If, at the command prompt, you try to copy, move or otherwise manipulate files that have spaces in their names, you ll run into problems. For example, suppose you want to move the file picture from germany.jpg to the directory mydirectory. In theory the following command should do the trick: mv picture from germany.jpg mydirectory/ But when we tried it on our test Ubuntu setup, we got the following errors: mv: cannot stat 'picture': No such file or directory mv: cannot stat 'from': No such file or directory mv: cannot stat 'germany.jpg': No such file or directory
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In other words, BASH had interpreted each word as a separate file and tried to move each of them! The error messages tell us that BASH cannot find the file picture, from, or germany.jpg. There are two solutions. The easiest is to enclose the filename in quotation marks ("), so the previous command would read as follows: mv "picture from germany.jpg" mydirectory/ The other solution is to precede each space with a backslash. This tells BASH you re including a literal character in the filename. In other words, you re telling BASH not to interpret the space in the way it normally does, which is as a separator between filenames or commands. Here s how the command looks if you use backslashes: mv picture\ from\ germany.jpg mydirectory/ The backslash can also be used to stop BASH from interpreting other symbols in the way it normally does. For example, the less than and greater than symbols (<>) have a specific meaning in BASH, which we discuss in 17, but they re allowed in filenames. So to copy the file <bach>.mp3 to the directory mydirectory, you could type: cp \<bach\>.mp3 mydirectory/ Generally speaking, however, simply enclosing filenames in quotation marks is the easiest approach.
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Changing and Creating Directories
Another handy command is cd, for change directory. This lets you move around the file system, from directory to directory. Say you re in a directory that has another directory in it, named mydirectory2. Switching to it is easy:
cd mydirectory2
But how do you get out of this directory once you re in it Try the following command:
cd ..
The .. refers to the parent directory, which is the one containing the directory you re currently browsing. Using two dots to indicate this may seem odd, but it s just the way that Ubuntu (and Unix before it) does things. It s one of the many conventions that Unix relies on and that you ll pick up as you go along. You can create directories with the mkdir command:
mkdir mydirectory
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What if you want to create a new directory and, at the same time, create a new directory to contain it Simply use the -p command option. The following command will create a new folder called flowers and, at the same time, create a directory within flowers called daffodil:
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