Rename Files In Dev C
Table of Contents
- all files are case sensitive
- everything is a file
- file
- touch
- create an empty file
- touch -t
- rm
- remove forever
- rm -i
- rm -rf
- cp
- copy one file
- copy to another directory
- cp -r
- copy multiple files to directory
- cp -i
- mv
- rename files with mv
- rename directories with mv
- mv -i
- rename
- about rename
- rename on Debian/Ubuntu
- rename on CentOS/RHEL/Fedora
- practice: working with files
- solution: working with files
Are these files in one folder? If so, you can get all files from this folder into a FileInfo (you need fileInfo, because you need a full path, so set files back where they were before renaiming). Then you do some additional code of renaiming and use Move method for an actual renaiming. You should avoid renaming items managed by TFVC using your operating system (for example, using Windows File Explorer, or the rename command in the Windows command prompt). When you have used your operating system to rename an item in a local workspace, Visual Studio detects the change as two changes: an add and a delete. To delete any file from the current directory using C programming language, you have to ask from user to enter the name of file first. And then perform the operation of deleting it from the directory. The function remove is used to delete a file. It takes the name of file as its argument and returns 0 if file gets deleted successfully.
In this chapter we learn how to recognise, create, remove, copy and move files using commands like file, touch, rm, cp, mv and rename.
Files on Linux (or any Unix) are case sensitive. This means that FILE1 is different from file1, and /etc/hosts is different from /etc/Hosts (the latter one does not exist on a typical Linux computer).
This screenshot shows the difference between two files, one with upper case W, the other with lower case w.
A directory is a special kind of file, but it is still a (case sensitive!) file. Each terminal window (for example /dev/pts/4), any hard disk or partition (for example /dev/sdb1) and any process are all represented somewhere in the file system as a file. It will become clear throughout this course that everything on Linux is a file.
The file utility determines the file type. Linux does not use extensions to determine the file type. The command line does not care whether a file ends in .txt or .pdf. As a system administrator, you should use the file command to determine the file type. Here are some examples on a typical Linux system.
The file command uses a magic file that contains patterns to recognise file types. The magic file is located in /usr/share/file/magic. Type man 5 magic for more information.
It is interesting to point out file -s for special files like those in /dev and /proc.
One easy way to create an empty file is with touch. (We will see many other ways for creating files later in this book.)
This screenshot starts with an empty directory, creates two files with touch and the lists those files.
The touch command can set some properties while creating empty files. Can you determine what is set by looking at the next screenshot? If not, check the manual for touch.
When you no longer need a file, use rm to remove it. Unlike some graphical user interfaces, the command line in general does not have a waste bin or trash can to recover files. When you use rm to remove a file, the file is gone. Therefore, be careful when removing files!
To prevent yourself from accidentally removing a file, you can type rm -i.
By default, rm -r will not remove non-empty directories. However rm accepts several options that will allow you to remove any directory. The rm -rf statement is famous because it will erase anything (providing that you have the permissions to do so). When you are logged on as root, be very careful with rm -rf (the f means force and the r means recursive) since being root implies that permissions don't apply to you. You can literally erase your entire file system by accident.
To copy a file, use cp with a source and a target argument.
If the target is a directory, then the source files are copied to that target directory.
To copy complete directories, use cp -r (the -r option forces recursive copying of all files in all subdirectories).
You can also use cp to copy multiple files into a directory. In this case, the last argument (a.k.a. the target) must be a directory.
To prevent cp from overwriting existing files, use the -i (for interactive) option.
Use mv to rename a file or to move the file to another directory.
When you need to rename only one file then mv is the preferred command to use.
The same mv command can be used to rename directories.
The mv also has a -i switch similar to cp and rm.
this screenshot shows that mv -i will ask permission to overwrite an existing file.
The rename command is one of the rare occasions where the Linux Fundamentals book has to make a distinction between Linux distributions. Almost every command in the Fundamentals part of this book works on almost every Linux computer. But rename is different.
Try to use mv whenever you need to rename only a couple of files.
The rename command on Debian uses regular expressions (regular expression or shor regex are explained in a later chapter) to rename many files at once.
Below a rename example that switches all occurrences of txt to png for all file names ending in .txt.
This second example switches all (first) occurrences of file into document for all file names ending in .png.
On Red Hat Enterprise Linux, the syntax of rename is a bit different. The first example below renames all *.conf files replacing any occurrence of .conf with .backup.
The second example renames all (*) files replacing one with ONE.
1. List the files in the /bin directory
2. Display the type of file of /bin/cat, /etc/passwd and /usr/bin/passwd.
3a. Download wolf.jpg and LinuxFun.pdf from http://linux-training.be (wget http://linux-training.be/files/studentfiles/wolf.jpg and wget http://linux-training.be/files/books/LinuxFun.pdf)
3b. Display the type of file of wolf.jpg and LinuxFun.pdf
3c. Rename wolf.jpg to wolf.pdf (use mv).
3d. Display the type of file of wolf.pdf and LinuxFun.pdf.
4. Create a directory ~/touched and enter it.
5. Create the files today.txt and yesterday.txt in touched.
6. Change the date on yesterday.txt to match yesterday's date.
7. Copy yesterday.txt to copy.yesterday.txt
8. Rename copy.yesterday.txt to kim
9. Create a directory called ~/testbackup and copy all files from ~/touched into it.
10. Use one command to remove the directory ~/testbackup and all files into it.
11. Create a directory ~/etcbackup and copy all *.conf files from /etc into it. Did you include all subdirectories of /etc ?
12. Use rename to rename all *.conf files to *.backup . (if you have more than one distro available, try it on all!)
1. List the files in the /bin directory
2. Display the type of file of /bin/cat, /etc/passwd and /usr/bin/passwd.
3a. Download wolf.jpg and LinuxFun.pdf from http://linux-training.be (wget http://linux-training.be/files/studentfiles/wolf.jpg and wget http://linux-training.be/files/books/LinuxFun.pdf)
3b. Display the type of file of wolf.jpg and LinuxFun.pdf
3c. Rename wolf.jpg to wolf.pdf (use mv).
3d. Display the type of file of wolf.pdf and LinuxFun.pdf.
4. Create a directory ~/touched and enter it.
5. Create the files today.txt and yesterday.txt in touched.
6. Change the date on yesterday.txt to match yesterday's date.
7. Copy yesterday.txt to copy.yesterday.txt
8. Rename copy.yesterday.txt to kim
9. Create a directory called ~/testbackup and copy all files from ~/touched into it.
10. Use one command to remove the directory ~/testbackup and all files into it.
11. Create a directory ~/etcbackup and copy all *.conf files from /etc into it. Did you include all subdirectories of /etc ?
12. Use rename to rename all *.conf files to *.backup . (if you have more than one distro available, try it on all!)
« Previous ProgramNext Program »In this article, you will learn and get code to delete a file from the current directory in C++. Here the current directory means, the directory where you are saving your C++ source code, or going to save your C++ source code that deletes file as given below.
Things to Do before Program
Rename Files In Dev City
Before starting the program to delete a file say codescracker.txt using C++ code from the current directory. The file say codescracker.txt must be created. Therefore the file is created and saved inside the folder cpp programs where I'm going to save the source code (given below) to delete this file:
Now let's move on to create a C++ program that deletes this file named codescracker.txt.
Note - You can create and save this file to the folder where you'll save your program given below.
Delete a File from Current Directory
To delete any file from the current directory using C++ programming language, you have to ask from user to enter the name of file first. And then perform the operation of deleting it from the directory.
The functionremove() is used to delete a file. It takes the name of file as its argument and returns 0 if file gets deleted successfully. And if it doesn't returns 0, then anything strange occurred such as file doesn't exist or user has not the permission to access the directory etc.
The question is, write a program in C++ that deletes a file from the current directory. Below is its answer:
This program was build and run under Code::Blocks IDE. Here is its sample run. The above program is saved in cpp programs folder, where the file, codescracker.txt was created earlier:
Now enter the name of file say codescracker.txt (as created earlier) to delete it, as shown in the output given below:
Now if you opens the folder cpp programs (the folder where you've saved the file codescracker.txt and above source code), then it looks like, as shown in the snapshot given below. That is, the file gets removed from this folder: