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MX on Linux: Difference between revisions
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=== nano === | === nano === | ||
There are various text editors available on a Pi, '''nano''' is a simple one. Like other text editors this can create a file when a file does not exist and edit (subject to file permissions) an existing file. The sudo gives you access to any file, it does not change the actual file access, so you might find you can read a file, but not save it after you have done your edit. After typing the nano command you need to specify a filename (it might include a path, see previous sub-section) and there are examples later in this article, but if you decide to host a web site on your Pi then you might want to edit its home page with (.html or .php) name like <tt>sudo nano /var/www/html/index.php</tt>. After you have made an alteration to the current contents of the file, various options are shown at the bottom. Here are two key ones: | There are various text editors available on a Pi, '''nano''' is a simple one. Like other text editors this can create a file when a file does not exist and edit (subject to file permissions) an existing file. The sudo gives you access to any file, it does not change the actual file access, so you might find you can read a file, but not save it after you have done your edit. | ||
The full syntax is <tt>sudo nano -B Path_file_name</tt> where the '''-B''' means it will create a backup of how the file was before. Alternatively use '''-C''' which stores each version in a back-up directory. If you want to edit from a particular line and column you can use '''+line.column''', and also optionally use '''-l''' (lower-case "L") to display line numbers which might be useful when trying to correct a problem with a log file like [[dayfile.txt]]. If you don't specify a file name, then nano will create a new file and you will need to specify where to save it before exit. | |||
After typing the nano command you need to specify a filename (it might include a path, see previous sub-section) and there are examples later in this article, but if you decide to host a web site on your Pi then you might want to edit its home page with (.html or .php) name like <tt>sudo nano /var/www/html/index.php</tt>. After you have made an alteration to the current contents of the file, various options are shown at the bottom. Here are two key ones: | |||
*First is '''^O''' which is used to save the file whilst staying in the editor, to do this press the control key down and type O. Next it shows the current file name, if you press '''Enter''' then that file will be overwritten. | *First is '''^O''' which is used to save the file whilst staying in the editor, to do this press the control key down and type O. Next it shows the current file name, if you press '''Enter''' then that file will be overwritten. | ||
*Another is '''^X''' which means if you press the control key down and type X you get the exit dialogue. If you have not used control and O to save the file, it asks whether you want to save the edited file (type '''Y'''), although the Y carries on, any other key stroke cancels without saving, then it shows the current file name, if you press '''Enter''' then that file will be overwritten. | *Another is '''^X''' which means if you press the control key down and type X you get the exit dialogue. If you have not used control and O to save the file, it asks whether you want to save the edited file (type '''Y'''), although the Y carries on, any other key stroke cancels without saving, then it shows the current file name, if you press '''Enter''' then that file will be overwritten. | ||
