vi Cheat Sheet

Navigating File
asdf
w forward one wordb back to start of word
0 start of line$ end of line
nG go to line nG go to last line
Inserting Text (§) ESC to finish
i insert before cursor (§)A append at the end of line (§)
o open new line below (§)C change to end of line (§)
O open new line above (§)D delete to end of line
Editing:1 char1 wordn words1 linen lines
deletexdwndwddndd
changercw(§)ncw(§)cc(§)ncc(§)
copy (yank) into bufferywnywyynyy
p paste buffer after/below cursorP paste buffer before/above cursor
delete -> move cursor -> paste = cut & paste
copy -> move cursor -> paste = duplicate
Searching for Text:
/pattern search for patternn repeat last search
:n,ms/old/new/ between lines n and m substitute old with new
Miscellaneous
. repeat last edit commandu undo last edit command
>> indent lineU undo all changes to current line
J join lines^L redraw screen
Writing the file/Quitting vi
:r file read contents of file and place after current line
:n,mw file write portion of file between lines n and m to file
:w save:w file save to file:w! force save (often as root)
:q quit:wq save & quit:q! force quit (no save)
Escaping into shell
:!ksh run interative shell; press ^D to return to vi
:!cmd run cmd; press <CR> to return to vi
!!cmd run cmd; put its output into file being edited

Comments

Post a Comment

Popular posts from this blog

How to: Add Watermark to PDFs Programmatically using iTextSharp

Being able to add text or image watermark to PDF files is one of those handy things you can archive via program. The only library required for the little program is iTextSharp . For those who haven't used it yet, iTextSharp is a C# version of iText , which allows you to generate or manipulate PDFs. So let's cut the chitchat, and go straight to the code. By calling 'AddTextWatermark' or 'AddImageWatermark' function with required parameters supplied, you are ready to rock! public void CreateTemplate(string watermarkText, string targetFileName){     var document = new Document();     var pdfWriter = PdfWriter.GetInstance(document, new FileStream(targetFileName, FileMode.Create));     var font = new Font(Font.FontFamily.HELVETICA, 60, Font.NORMAL, BaseColor.LIGHT_GRAY);     document.Open();     // Specify font and alignment of text watermark     ColumnText.ShowTextAligned(pdfWriter.DirectContent, Element.ALIGN_CENTER, new ...
Read more

A practical guide to Scala Traits

Trait - has a super class of AnyRef   - uses extends  or with for inheriting a trait ( with to inherit multiple traits)   - defines a type   - can be overridden using override  keyword   Trait vs Interface (Java)   - trait can declare fields and main state   - rich vs thin interfaces (every concrete method added to trait makes it richer)   Trait vs Class   - trait can NOT have any class parameters        trait doesn't support coding in this style: class Point(x: Int, y: Int) - super calls are statically bound in classes, but dynamically bound in trait         super.toString  is predicable in classes, but not in trait when mixing   Ordered Trait   Traits as stackable modifications   - order of mixins: right most trait takes effect first   When to use Trait?   - If the behaviour will not be reused, then make it a concrete class   - If it might be reused in multip...
Read more

A Short Guide to AWK

AWK is built to process column-oriented text data, such as tables. In which a file is considered to consist of N records (rows) by M fields (columns) Basic # awk < file ‘{print $2}’ # awk ‘{print $2}’ file file = input file print $2 = 2nd field of the line, awk has whitespace as the default delimiter Delimiter # awk -F: ‘{print $2}’ file -F: = use ‘:’ as delimiter # awk -F ‘[:;]’ ‘{print $2}’ file -F ‘[:;]’ = use multiple delimiter, and parse using EITHER ‘:’ OR ‘;’ # awk -F ‘:;’ ‘{print $2}’ file   -F ‘:;’ = use multiple delimiter, and parse using ':;’ as THE delimiter # awk -F ‘:’+ ‘{print $2}’ file   -F ‘:’+ = use multiple delimiter, to match any number ':' Arithmetic # echo 5 4 | awk '{print $1 + $2}' output is '9', the result of ‘+’ (works as addition) # echo 5 4 | awk '{print $1 $2}' output is '54', to get string concatenation #  echo 5 4 | awk '{print $1, $2}' output is '5 4',...
Read more