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Top Forums Shell Programming and Scripting sed to replace two lines with one Post 302455118 by rdcwayx on Monday 20th of September 2010 09:52:08 PM
Old 09-20-2010
Not really correct:

Code:
cat infile

XXXX
ab
abcd


sed 'N; /^\([^\n]\{1,\}\)\n\1/s/.*\n//' infile
XXXX
ab
abcd

cat infile

ab
abcd

sed 'N; /^\([^\n]\{1,\}\)\n\1/s/.*\n//' infile
abcd



---------- Post updated at 11:52 AM ---------- Previous update was at 11:49 AM ----------

and if you see this situation, what's your expect output?

Code:
ab
abc
abcd
abcde

 

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STRCSPN(3)								 1								STRCSPN(3)

strcspn - Find length of initial segment not matching mask

SYNOPSIS
int strcspn (string $str1, string $str2, [int $start], [int $length]) DESCRIPTION
Returns the length of the initial segment of $str1 which does not contain any of the characters in $str2. PARAMETERS
o $str1 - The first string. o $str2 - The second string. o $start - The start position of the string to examine. o $length - The length of the string to examine. RETURN VALUES
Returns the length of the segment as an integer. EXAMPLES
Example #1 strcspn(3) example <?php $a = strcspn('abcd', 'apple'); $b = strcspn('abcd', 'banana'); $c = strcspn('hello', 'l'); $d = strcspn('hello', 'world'); var_dump($a); var_dump($b); var_dump($c); var_dump($d); ?> The above example will output: int(0) int(0) int(2) int(2) NOTES
Note This function is binary-safe. SEE ALSO
strspn(3). PHP Documentation Group STRCSPN(3)
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