{"id":700,"date":"2018-08-07T12:47:10","date_gmt":"2018-08-07T11:47:10","guid":{"rendered":"https:\/\/portal.supercomputing.wales\/?page_id=700"},"modified":"2018-08-07T12:54:07","modified_gmt":"2018-08-07T11:54:07","slug":"using-vi","status":"publish","type":"page","link":"https:\/\/portal.supercomputing.wales\/index.php\/using-vi\/","title":{"rendered":"Using Vi"},"content":{"rendered":"

What is Vi?<\/h3>\n
Vi (pronounced vee-eye) is a text editor available on Super Computing Wales and virtually all Linux and Unix based computers. It was originally developed by Bill Joy in 1976 while he was at the University of California, Berkeley. Vi was designed to run on remote terminals over very slow connections and is known as the “visual editor”. Vi is part of the Linux standard base so you can guarantee that it will be installed on other Linux systems you may have access to.<\/div>\n

 <\/p>\n

Using Vi<\/h3>\n
To use Vi on Super Computing Wales you must logon to a head node such as hawklogin.cf.ac.uk. You can only use it in terminal mode. To logon to Super Computing Wales you can use PuTTY. Please read the documentation before installing, and note that you can download PuTTY for free and install it on your computer.<\/div>\n

 <\/p>\n

Getting Started<\/h3>\n
To begin editing a new file type “vi” at the command prompt<\/div>\n
Then type “i” to change to insert mode and begin typing<\/div>\n
Then press the <Esc> key when you are done typing<\/div>\n
Then type “:w path\/to\/file” and hit enter to save the file<\/div>\n
Then type “:q” to quit vi<\/div>\n

 <\/p>\n

Starting Vi<\/h3>\n
\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
vi<\/td>run vi<\/td>\n<\/tr>\n
vi myfile.txt<\/td>run vi and open myfile.txt<\/td>\n<\/tr>\n
vim<\/td>run vim<\/td>\n<\/tr>\n
vim \/home\/user\/myfile.txt<\/td>run vim and open \/home\/user\/myfile.txt<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
<\/div>\n

Leaving Vi<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
ZZ<\/td>quit vi and write current file<\/td>\n<\/tr>\n
:q<\/td>quit vi<\/td>\n<\/tr>\n
:wq<\/td>write current file and quit
\n<\/td>\n<\/tr>\n
:q!<\/td>quit vi and do not write current file<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

File Operations<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
:e \/home\/user\/myfile.txt<\/td>edit myfile.txt (tab completion works)<\/td>\n<\/tr>\n
:w \/home\/user\/myfile.txt
\n
\n<\/td>		write myfile.txt (tab completion works)<\/td>\n<\/tr>\n
:w<\/td>write open file<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

Modes<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
Key<\/td>return to command mode<\/td>\n<\/tr>\n
i<\/td>change to insert mode before current cursor position<\/td>\n<\/tr>\n
a<\/td>change to insert mode after current cursor position<\/td>\n<\/tr>\n
o<\/td>change to insert mode but start a new line below current cursor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

Cursor Operations<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
[repeat]w<\/td>move forwards [repeat] words<\/td>\n<\/tr>\n
[repeat]b<\/td>move backwards [repeat] words<\/td>\n<\/tr>\n
^<\/td>move to the beginning of the line<\/td>\n<\/tr>\n
0<\/td>move to the beginning of the line<\/td>\n<\/tr>\n
[repeat]f<\/td>move forwards to the [repeat] instance of <\/td>\n<\/tr>\n
[repeat]F<\/td>move backwards to the [repeat] instance of <\/td>\n<\/tr>\n
[number]G<\/td>move to line [number]<\/td>\n<\/tr>\n
H<\/td>move to the home line (first line on the screen)<\/td>\n<\/tr>\n
M<\/td>move to the middle line (on the screen)<\/td>\n<\/tr>\n
L<\/td>move to the last line (on the screen)<\/td>\n<\/tr>\n
(<\/td>move backwards one sentence<\/td>\n<\/tr>\n
)<\/td>move forwards one sentence<\/td>\n<\/tr>\n
{<\/td>move backwards one paragraph<\/td>\n<\/tr>\n
}<\/td>move forwards one paragraph<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

Edit Operations<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
u<\/td>undo<\/td>\n<\/tr>\n
r<\/td>redo<\/td>\n<\/tr>\n
[repeat]dw<\/td>delete (cut) [repeat] words<\/td>\n<\/tr>\n
[repeat]dd<\/td>delete (cut) [repeat] lines<\/td>\n<\/tr>\n
d$<\/td>delete (cut) to end of line<\/td>\n<\/tr>\n
dG<\/td>delete (cut) to end of file<\/td>\n<\/tr>\n
[repeat]yw<\/td>yank (copy) [repeat] words<\/td>\n<\/tr>\n
[repeat]yy<\/td>yank (copy) [repeat] lines<\/td>\n<\/tr>\n
p<\/td>put (paste)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

Search and Replace<\/h3>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Command<\/th>Description<\/th>\n<\/tr>\n<\/thead>\n
[repeat]\/<\/td>search forwards to the [repeat] instance of <\/td>\n<\/tr>\n
:s\/\/<\/td>search and replace the first instance of with
\n on this line<\/td>\n<\/tr>\n
:s\/\/\/g<\/td>search and replace all instances of with \n> on this line<\/td>\n<\/tr>\n
:%s\/\/\/g<\/td>search and replace all instances of with \nstring> in this file<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

 <\/p>\n

Getting Help<\/h3>\n

:help<\/p>\n

 <\/p>\n

References<\/h3>\n
man vi – command line documentation<\/div>\n
<\/div>\n
Learning the Vi and Vim Editors, Seventh Edition, http:\/\/openisbn.com\/isbn\/059652983X<\/a><\/div>\n
\n

 <\/p>\n

Downloading<\/h3>\n
You can download a version to run on your local workstation from http:\/\/www.vim.org\/<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

What is Vi? Vi (pronounced vee-eye) is a text editor available on Super Computing Wales and virtually all Linux and Unix based computers. It was originally developed by Bill Joy in 1976 while he was at the University of California, Berkeley. Vi was designed to run on remote terminals over very slow connections and is […]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"class_list":["post-700","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/pages\/700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/comments?post=700"}],"version-history":[{"count":13,"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/pages\/700\/revisions"}],"predecessor-version":[{"id":807,"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/pages\/700\/revisions\/807"}],"wp:attachment":[{"href":"https:\/\/portal.supercomputing.wales\/index.php\/wp-json\/wp\/v2\/media?parent=700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}