NSCI 580A4 fall 2017

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NSCI 580A4

Instructors
Tai Montgomery
Erin Nishimura

wiki:2016cpmv

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Copying & Moving

Copying files and directories with cp

The cp (CoPy) command is quite flexible. There are a few ways it can be used to copy a file.

Duplicating a file and giving it a new name

This can be used to copy the contents of a file (the source file) into a new file (the target file) with a new name:

cp <source_file.txt> <target_file.txt>

Exercise: Make a file called file1.txt. Add some text to file1.txt. Next, make file2.txt like so…

$cp file1.txt file2.txt$ls
$less file2.txt You can think of this as basically shorthand for… $cp ./file1.txt ./file2.txt

Duplicating a file into a directory

Once you make the connection that names, absolute paths, or relative paths can substitute in for <source_file.txt> or <target_file.txt>, you can see how you can place the copied file in some other directory, or pull a copy of a file from a source directory into your working directory.

Duplicating a file into a directory and renaming it:
cp <source_file.txt> <target/path/targetname.txt>

OR

Duplicating a file from another directory into the current directory and renaming it:
cp <target/path/targetname.txt> <./targetname.txt>

Exercise: Make a directory called dir1. Place a copy of file1.txt into dir1.

$mkdir dir1$cp file1.txt dir1/file3.txt
$ls$ls dir1

Quick Tip: Absolute paths as well as relative paths can be used as the source and target in cp.

If you want to duplicate a file into a sub-directory, you don't need to change the name. To keep the name the same…

cp <source_file.txt> <target_directory>

Exercise: Try it out

$mkdir dir1$cp file1.txt dir1
$ls$ls dir1

A list of files can also be copied in this way:

cp <source_file.txt> … <target_directory>

– where “…” means you can keep adding additional source_files.txt, as many as you have.

Duplicating a directory and its contents

Directories that contain files can also be duplicated using cp. Just add the option -R.

$mkdir dir1$cp -R dir1 copy_of_dir1
$ls$ls copy_of_dir1

Independent Exercise: I like to stay organized by adding notes to myself within directories. These text files that contain little notes to myself about the purpose for the directory. I call these README or ABOUT files.

1. Navigate to your course directory you made earlier (the directory where ls will show you “01_Notes”, “02_Exercises”, etc)
2. Create a file called ABOUT_this_class.txt within the course directory.
3. Using nano, copy the “syllabus” page of this website into the ABOUT_this_class.txt file.
4. Use less to browse your new file.
5. Create a copy of this file in the directory “01_Notes” called ABOUT_these_notes.txt. Double check that the content is the same.
6. Create a copy of this file in the parent directory (one level up from where you are) keeping the file name the same.
7. Using a set of test directories, test what happens when you try to copy one directory into another using the command $cd dir1 dir2 versus $ cd dir1/ dir2.

Moving files and directories with mv

Once you know cp, mv is pretty much the same thing with one exception. The source file will disappear once the operation is complete. This ends up renaming your file if you are working within the same directory. It acts like cut-and-paste instead of a copy-and-paste if you're moving between directories.

 mv Rename source_file.txt to be called target_file.txt mv Move source_file.txt into dir and rename it target_file.txt mv Move source_file.txt(s) into dir and keep the names the same

Independent Exercise: Remember your directory called 160825_options_ex? MOVE that whole directory and its contents to the new directory ~/courseDirectory/02_Exercises you recently created within your course directory (where ~ stands for your appropriate path).