A "nano" - QUICK LINUX Tutorial (text editor)

This is a simple tutorial about "nano",  my favourite linux text editor in the command line. Let's begin.

CREATING A NEW FILE

From the command line, type "nano" without quotes and press enter. Note that if you provide nano with a file name, it wont create a new file, only open the one you passed by, for example "nano /home/user/Documents/mytextFile.txt".

Once opened, you will see something like this.

Next, you move the cursor wherever you want to start typing.

Type anything, when you are done writing, simple press "Ctrl + O" (the plus sign you don't have to type it).
A message appears at the bottom of the window, it ask you to name the file, in the case it is a new file.

nano text editor file opened

Now, type the name of the new file you want to create.

saving

After you typed the name of the file, just press "ENTER" and it will be saved.

write confirmation

The message says "Wrote 6 lines". well, that means it saved the file correctly.

Opening an existing file (read)

From the command line type:

$ nano myNewTextFile.txt

opened file

You now see the text that the file had in it. Also check that it says at the bottom "Read 6 lines".
Now, you can start editing and when you are done, you can save it.

Press CTRL + O again, but this time, as we are opened an existing file it already shows us  the name of the file at the bottom of the screen for overwriting it, or if we change the name it will create a new file with the new name you just typed.

saving file

Press Enter to save and overwrite the existing file or "Ctrl + C" to cancel the operation.

To quit nano, press "Ctrl + X".

Notes:

CUT
To cut text, you will have to type "Ctrl + K", note that the whole line will be cut.

PASTE

To paste the line, type "Ctrl + U". You can paste what you cut the number of times you want.

READ/INJECT

When you type "Ctrl + R" it injects the file content you specify where the cursor is located.

SEARCH (Where is?)

Type "Ctrl + W" to search for a specific word, phrase, note that it is case insensitive, so UPPERCASE and lowercase characters are treated equally.

REPLACE

Type "Ctrl + \" to replace the word you want with the new text typed. You will have to confirm typing "Y" when asked, Also check that if you type A it will replace all the occurrences in the file.  It is a three steps method, search, text to replace with, and confirmation.

This is all for now. 

See you in the next post.

[ S O L V E D ] - How to check if a string is a double safely in JAVA

String str = "1234.0123";
        try
        {
            Double dbl;
            dbl = Double.parseDouble(str);
            System.out.println("its a double");
         
        }
        catch(java.lang.NumberFormatException cce)
        {
        }

[ S O L V E D ] - cower: error while loading shared libraries: libalpm.so.9: cannot open shared object file: No such file or directory

If you are getting this error:

cower: error while loading shared libraries: libalpm.so.9: cannot open shared object file: No such file or directory


after upgrading your arch system, don't worry.

You will have to rebuild cower.

Download the cower package  cower-14-2 from the AUR repository.


From the command line go to where you downloaded the package, and type:

$ tar -zxvf
$ cower.tar.gz
$ cd cower
$ makepkg -sri

You will be prompted for a password as pacman needs it to install it.



done!