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Top Forums Shell Programming and Scripting awk logic for tailing and printing Post 302876411 by SkySmart on Sunday 24th of November 2013 10:10:18 AM
Old 11-24-2013
awk logic for tailing and printing

if the last line of an output contains a certain string 'FAILED', i want to print 200 lines from the output.

here's where I got stuck:

Code:
process blah blah blah | awk '{if ($0 ~ /FAILED/) y=x "\n" $0; x=$0};END{print y}'

the above only prints the last 2 lines, and it also searches the entire output for the word "FAILED". i dont want to search the entire output as it can be pretty large. i just want to check the last line of the output, and if this last line contains the word "FAILED", i want the awk to then print the last 200 lines of the output.

so basically, printing the last 200 lines of the output should be dependent only on IF the last line of the output contains the word "FAILED".
 

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PRINT(3)								 1								  PRINT(3)

print - Output a string

SYNOPSIS
int print (string $arg) DESCRIPTION
Outputs $arg. print is not actually a real function (it is a language construct) so you are not required to use parentheses with its argument list. PARAMETERS
o $arg - The input data. RETURN VALUES
Returns 1, always. EXAMPLES
Example #1 print examples <?php print("Hello World"); print "print() also works without parentheses."; print "This spans multiple lines. The newlines will be output as well"; print "This spans multiple lines. The newlines will be output as well."; print "escaping characters is done "Like this"."; // You can use variables inside a print statement $foo = "foobar"; $bar = "barbaz"; print "foo is $foo"; // foo is foobar // You can also use arrays $bar = array("value" => "foo"); print "this is {$bar['value']} !"; // this is foo ! // Using single quotes will print the variable name, not the value print 'foo is $foo'; // foo is $foo // If you are not using any other characters, you can just print variables print $foo; // foobar print <<<END This uses the "here document" syntax to output multiple lines with $variable interpolation. Note that the here document terminator must appear on a line with just a semicolon no extra whitespace! END; ?> NOTES
Note Because this is a language construct and not a function, it cannot be called using variable functions. SEE ALSO
echo(3), printf(3), flush(3), Heredoc syntax. PHP Documentation Group PRINT(3)
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