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Top Forums Shell Programming and Scripting Check file for string existence before appending it with string Post 302775001 by mirni on Monday 4th of March 2013 01:55:13 AM
Old 03-04-2013
Use semicolon to execute commands consecutively. You are incorrectly using pipe instead.
The easiest way is to do:
Code:
if grep -q string file.txt ; then 
  echo "string found" 
else
  echo "not found"
fi

This User Gave Thanks to mirni For This Post:
 

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STRISTR(3)								 1								STRISTR(3)

stristr - Case-insensitivestrstr(3)

SYNOPSIS
string stristr (string $haystack, mixed $needle, [bool $before_needle = false]) DESCRIPTION
Returns all of $haystack starting from and including the first occurrence of $needle to the end. 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 $before_needle - If TRUE, stristr(3) returns the part of the $haystack before the first occurrence of the $needle (excluding needle). $needle and $haystack are examined in a case-insensitive manner. RETURN VALUES
Returns the matched substring. If $needle is not found, returns FALSE. CHANGELOG
+--------+-----------------------------------------------+ |Version | | | | | | | Description | | | | +--------+-----------------------------------------------+ | 5.3.0 | | | | | | | Added the optional parameter $before_needle. | | | | | 4.3.0 | | | | | | | stristr(3) was made binary safe. | | | | +--------+-----------------------------------------------+ EXAMPLES
Example #1 stristr(3) example <?php $email = 'USER@EXAMPLE.com'; echo stristr($email, 'e'); // outputs ER@EXAMPLE.com echo stristr($email, 'e', true); // As of PHP 5.3.0, outputs US ?> Example #2 Testing if a string is found or not <?php $string = 'Hello World!'; if(stristr($string, 'earth') === FALSE) { echo '"earth" not found in string'; } // outputs: "earth" not found in string ?> Example #3 Using a non "string" needle <?php $string = 'APPLE'; echo stristr($string, 97); // 97 = lowercase a // outputs: APPLE ?> NOTES
Note This function is binary-safe. SEE ALSO
strstr(3), strrchr(3), stripos(3), strpbrk(3), preg_match(3). PHP Documentation Group STRISTR(3)
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