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Top Forums Shell Programming and Scripting sed - searching token in certain order Post 302851377 by jcdole on Sunday 8th of September 2013 12:25:02 PM
Old 09-08-2013
sed - searching token in certain order

I would like to write a bash function which would return "true" if the search succeed else return anything else.

something like

if [[ "$(my_funct  a_file_name  a_token1  a_token2  a_token3 a_token4)" != "true" ]] ; then

    exit 1


function my_funct () {

    find first occurrence $2 in $1
    if not found return "false"
    from that position, find first occurrence $3 in any following line
           but before founding $5
           if not found return "false"
    from that position, find first occurrence $4 in the same line
    if not found return "false"
    return "true"


$1 : The file, where to search in, is a text file.

$2 : must start at the beginning of a line and can contains / or ' like :
 ### /a/path/name ###
menuentry  'software version.number'

$3 : must begin at the beginning of a line, or begin with a tab, or begin with a space like :
 --> a_string

$4 : is any single word or init 3

$5 : is a single character but could be }

Last edited by Don Cragun; 09-08-2013 at 03:01 PM.. Reason: Change Bold text to ICODE tags; add CODE tags.
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STRRPOS(3)								 1								STRRPOS(3)

strrpos - Find the position of the last occurrence of a substring in a string

int strrpos (string $haystack, string $needle, [int $offset]) DESCRIPTION
Find the numeric position of the last occurrence of $needle in the $haystack string. PARAMETERS
o $haystack - The string to search in. o $needle - If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character. o $offset - If specified, search will start this number of characters counted from the beginning of the string. If the value is negative, search will instead start from that many characters from the end of the string, searching backwards. RETURN VALUES
Returns the position where the needle exists relative to the beginnning of the $haystack string (independent of search direction or off- set). Also note that string positions start at 0, and not 1. Returns FALSE if the needle was not found. Warning This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.0.0 | | | | | | | The $needle may now be a string of more than one | | | character. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 Checking if a needle is in the haystack It is easy to mistake the return values for "character found at position 0" and "character not found". Here's how to detect the difference: <?php $pos = strrpos($mystring, "b"); if ($pos === false) { // note: three equal signs // not found... } ?> Example #2 Searching with offsets <?php $foo = "0123456789a123456789b123456789c"; var_dump(strrpos($foo, '7', -5)); // Starts looking backwards five positions // from the end. Result: int(17) var_dump(strrpos($foo, '7', 20)); // Starts searching 20 positions into the // string. Result: int(27) var_dump(strrpos($foo, '7', 28)); // Result: bool(false) ?> SEE ALSO
strpos(3), stripos(3), strripos(3), strrchr(3), substr(3). PHP Documentation Group STRRPOS(3)

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