Full Discussion: Help need in Grep Command
Top Forums Shell Programming and Scripting Help need in Grep Command Post 302136197 by udaykishore on Sunday 16th of September 2007 09:02:48 AM
current_dir ='ps -o user|grep -v'USER'|uniq' #this would print the user id "

v_name=`date +%m%d%y`

Assuming current_dir has username and v_name has date and time.

file name u should use


Ur filename looks like uday101007.txt
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TRIM(3) 								 1								   TRIM(3)

trim - Strip whitespace (or other characters) from the beginning and end of a string

string trim (string $str, [string $character_mask = " 0r B"]) DESCRIPTION
This function returns a string with whitespace stripped from the beginning and end of $str. Without the second parameter, trim(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. PARAMETERS
o $str - The string that will be trimmed. o $character_mask - Optionally, the stripped characters can also be specified using the $character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters. RETURN VALUES
The trimmed string. EXAMPLES
Example #1 Usage example of trim(3) <?php $text = " These are a few words :) ... "; $binary = "x09Example stringx0A"; $hello = "Hello World"; var_dump($text, $binary, $hello); print " "; $trimmed = trim($text); var_dump($trimmed); $trimmed = trim($text, " ."); var_dump($trimmed); $trimmed = trim($hello, "Hdle"); var_dump($trimmed); $trimmed = trim($hello, 'HdWr'); var_dump($trimmed); // trim the ASCII control characters at the beginning and end of $binary // (from 0 to 31 inclusive) $clean = trim($binary, "x00..x1F"); var_dump($clean); ?> The above example will output: string(32) " These are a few words :) ... " string(16) " Example string " string(11) "Hello World" string(28) "These are a few words :) ..." string(24) "These are a few words :)" string(5) "o Wor" string(9) "ello Worl" string(14) "Example string" Example #2 Trimming array values with trim(3) <?php function trim_value(&$value) { $value = trim($value); } $fruit = array('apple','banana ', ' cranberry '); var_dump($fruit); array_walk($fruit, 'trim_value'); var_dump($fruit); ?> The above example will output: array(3) { [0]=> string(5) "apple" [1]=> string(7) "banana " [2]=> string(11) " cranberry " } array(3) { [0]=> string(5) "apple" [1]=> string(6) "banana" [2]=> string(9) "cranberry" } NOTES
Note Possible gotcha: removing middle characters Because trim(3) trims characters from the beginning and end of a string, it may be confusing when characters are (or are not) removed from the middle. trim('abc', 'bad') removes both 'a' and 'b' because it trims 'a' thus moving 'b' to the beginning to also be trimmed. So, this is why it "works" whereas trim('abc', 'b') seemingly does not. SEE ALSO
ltrim(3), rtrim(3), str_replace(3). PHP Documentation Group TRIM(3)

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