|Home||Switchboard||Unix Administration||Red Hat||TCP/IP Networks||Neoliberalism||Toxic Managers|
May the source be with you, but remember the KISS principle ;-)
Bigger doesn't imply better. Bigger often is a sign of obesity, of lost control, of overcomplexity, of cancerous cells
|Old News ;-)||See Also||Recommended Links||Reference||.vimrc||History||Humor||Etc|
While basic editing operation are not problem, most vi users have a difficult time replacing string, especially globally.
vi offers powerful commands similar to what most modern editors offer. But syntax is tricky and this is the argument against vi. The commands are difficult both to learn and read. without practice you forgen them soon.
You need to learn to use s command which has its own ex derived syntax:
Here old and new are placeholders for actual strings and from and to are line numbers for region of the text where replacement should be performed. The optional g means to replace everywhere. Without it, only the first occurrence on each line will be replaced. To replace green with blue in your entire document, use
1,$s/green/blue/gTo replace blue with green in lines 10 through 24 use
The search and replace command allows regular expression to be used over a range of lines and replace the matching string. The user can ask for confirmation before the substitution is performed. More examples:
1,$s/the/The/g Search the entire file and replace the with The. %s/the/The/g % means the complete file. (Same as above). .,5s/^.*//g Delete the contents from the current to 5th line. %s/the/The/gc Replace the with The but ask before substituting. %s/^....//g Delete the first four characters on each line.
The search command is more powerful when combined with the regular expression search strings. If the g directive is not included or range on line is one line then the change is performed only on the first occurrence of a match on each line.
Sometimes you may want to use the original search string in the replacement result. You could retype the command on the line but vi allows the replacement string to contain some special characters.
1,5s/help/&ing/g Replaces help with helping on the first 5 lines. %s/ */&&/g Double the number of spaces between the words.
Using the complete match string has its limits hence vi uses the escaped parentheses \( and \) to select the range of the substitution. Using an escaped digit such as \1 you can identify which matching string goes where:
s/^\(.*\):.*/\1/g Delete everything after and including the colon. s/\(.*\):\(.*\)/\2:\1/g Swap the words either side of the colon.
Searching text strings vi also a (pretty obscure) set of search commands. You can search for individual characters, strings or regular expressions.
The main two character based search commands are f and t.
fc Find the next character c. Moves RIGHT to the next. Fc Find the next character c. Moves LEFT to the preceding. tc Move RIGHT to character before the next c. Tc Move LEFT to the character following the preceding c. (Some clones this is the same as Fc) ; Repeats the last f,F,t,T command , Same as ; but reverses the direction to the original command.
If the character you were searching for was not found, vi will beep or give some other sort of signal.
Like all editors vi allows you to search for a string in the edit buffer.
/str Searches Right and Down for the next occurrence of str. ?str Searches Left and UP for the next occurrence of str. n Repeat the last / or ? command N Repeats the last / or ? in the Reverse direction.
When using the / or ? commands a line will be cleared along the bottom of the screen. You enter the search string followed by RETURN.
The string in the command [/] or [?] can be a regular expression. A regular expression is a description of a set of characters. The description is build using text intermixed with special characters. The special characters in regular expressions are . *  ^$ .
. Matches any single character except newline. \ Escapes any special characters. * Matches 0 or More occurrences of the preceding character.  Matches exactly one of the enclosed characters. ^ Match of the next character must be at the begining of the line. $ Matches characters preceding at the end of the line. [^] Matches anything not enclosed after the not character. [-] Matches a range of characters.
c.pe Matches cope, cape, caper etc c\.pe Matches c.pe, c.per etc sto*p Matches stp, stop, stoop etc car.*n Matches carton, cartoon, carmen etc xyz.* Matches xyz to the end of the line. ^The Matches any line starting with The. atime$ Matches any line ending with atime. ^Only$ Matches any line with Only as the only word in the line. b[aou]rn Matches barn, born, burn. Ver[D-F] Matches VerD, VerE, VerF. Ver[^1-9] Matches Ver followed by any non digit. the[ir][re] Matches their,therr, there, theie. [A-Za-z][A-Za-z]* Matches any word.
vi uses ex command mode to perform search and replace operations. All commands which start with a colon are requests to execute command in ex mode.
Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers : Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism : The Iron Law of Oligarchy : Libertarian Philosophy
War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda : SE quotes : Language Design and Programming Quotes : Random IT-related quotes : Somerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose Bierce : Bernard Shaw : Mark Twain Quotes
Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 : Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law
Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history
The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Haterís Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite
Most popular humor pages:
Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor
The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D
Copyright © 1996-2018 by Dr. Nikolai Bezroukov. www.softpanorama.org was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) in the author free time and without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.
FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.
This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...
|You can use PayPal to make a contribution, supporting development of this site and speed up access. In case softpanorama.org is down you can use the at softpanorama.info|
The statements, views and opinions presented on this web page are those of the author (or referenced source) and are not endorsed by, nor do they necessarily reflect, the opinions of the author present and former employers, SDNP or any other organization the author may be associated with. We do not warrant the correctness of the information provided or its fitness for any purpose.
Last modified: September, 12, 2017