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Full Discussion: Another 'VI' question
Top Forums UNIX for Dummies Questions & Answers Another 'VI' question Post 12530 by peter.herlihy on Wednesday 2nd of January 2002 10:46:09 PM
Old 01-02-2002
Power Another 'VI' question

I want to know how I can strip and add blanklines from/to a text file with VI.

I have two scenarios that I am currently doing manually - and it's painful.

1) I need to strip any lines that have no characters on them at all..... (:set list shows me $)

and

2) I need to enter a blank line on every second line of a text file


I've tried the ole
:1,$ s/`\n`//g

and many other combinations - but without joy.... and I'm foreign to sed/awk. (although if theres a way I'd be happy to hear it).

Cheers
 

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LTRIM(3)								 1								  LTRIM(3)

ltrim - Strip whitespace (or other characters) from the beginning of a string

SYNOPSIS
string ltrim (string $str, [string $character_mask]) DESCRIPTION
Strip whitespace (or other characters) from the beginning of a string. PARAMETERS
o $str - The input string. o $character_mask - You can also specify the characters you want to strip, by means of the $character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters. RETURN VALUES
This function returns a string with whitespace stripped from the beginning of $str. Without the second parameter, ltrim(3) will strip these characters: o " " (ASCII 32 ( 0x20)), an ordinary space. o " " (ASCII 9 ( 0x09)), a tab. o " " (ASCII 10 ( 0x0A)), a new line (line feed). o " " (ASCII 13 ( 0x0D)), a carriage return. o "" (ASCII 0 ( 0x00)), the NUL-byte. o "x0B" (ASCII 11 ( 0x0B)), a vertical tab. EXAMPLES
Example #1 Usage example of ltrim(3) <?php $text = " These are a few words :) ... "; $binary = "x09Example stringx0A"; $hello = "Hello World"; var_dump($text, $binary, $hello); print " "; $trimmed = ltrim($text); var_dump($trimmed); $trimmed = ltrim($text, " ."); var_dump($trimmed); $trimmed = ltrim($hello, "Hdle"); var_dump($trimmed); // trim the ASCII control characters at the beginning of $binary // (from 0 to 31 inclusive) $clean = ltrim($binary, "x00..x1F"); var_dump($clean); ?> The above example will output: string(32) " These are a few words :) ... " string(16) " Example string " string(11) "Hello World" string(30) "These are a few words :) ... " string(30) "These are a few words :) ... " string(7) "o World" string(15) "Example string " SEE ALSO
trim(3), rtrim(3). PHP Documentation Group LTRIM(3)
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