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Top Forums Shell Programming and Scripting Sed to print a string until the second occurrence of a character Post 302367084 by imr on Sunday 1st of November 2009 06:27:00 AM
Old 11-01-2009
Sed to print a string until the second occurrence of a character

Hi, I am totally new to shell scripting.

I have a String "c:\working\html\index.txt.12-12-2009.bkp" I want to check if the string has more than one "." character. If it does I would like to retrieve only "c:\working\html\index.txt" i.e, discard the second occurrence of "." and the rest of the string, using Sed command.

The closest I could get to is the following Sed command.

$ echo "c:\working\html\index.txt.12-12-2009.bkp" | sed 's/.*[.]//'
result -> bkp

but it seems sed works from right to left of the string and so finds the last occurrence of the "." returning bkp.

I am using Cygwin to run these commands.
Sed version is "GNU sed version 4.1.5"
bash version si "GNU bash, version 3.2.49(22)-release (i686-pc-cygwin)"

TIA. imr
 

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MB_STRPOS(3)								 1							      MB_STRPOS(3)

mb_strpos - Find position of first occurrence of string in a string

SYNOPSIS
int mb_strpos (string $haystack, string $needle, [int $offset], [string $encoding = mb_internal_encoding()]) DESCRIPTION
Finds position of the first occurrence of a string in a string. Performs a multi-byte safe strpos(3) operation based on number of characters. The first character's position is 0, the second character position is 1, and so on. PARAMETERS
o $haystack - The string being checked. o $needle - The string to find in $haystack. In contrast with strpos(3), numeric values are not applied as the ordinal value of a character. o $offset - The search offset. If it is not specified, 0 is used. o $encoding -The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used. RETURN VALUES
Returns the numeric position of the first occurrence of $needle in the $haystack string. If $needle is not found, it returns FALSE. SEE ALSO
mb_internal_encoding(3), strpos(3). PHP Documentation Group MB_STRPOS(3)
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