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Full Discussion: awk and basename
Top Forums UNIX for Dummies Questions & Answers awk and basename Post 302576087 by agama on Wednesday 23rd of November 2011 02:58:01 PM
Old 11-23-2011
Quote:
Originally Posted by kaboink
confused here a bit. I'm not grepping the $process anymore before I awk?
that could mean the script would check all process output of ps aux right?
Yes, this means that the awk will be reading all of the output records from the ps command, however this is more efficient than searching for the string with grep and then processing the records with awk. For each record that grep matches, there is an extra write and read of that record to get it into the awk process. In addition, there is the extra overhead of starting grep. Since awk can perform the same 'record matching' function that grep does, it makes more sense to do both the matching and the processing of matched records in the same process. If awk were a process that is not capable of selecting the correct records to work on, then you would need to use grep to do the preprocessing.

For something as small as searching output from the ps command, the difference might not be noticeable, but it's good to practice these more efficient habits all of the time.
 

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BASENAME(3)								 1							       BASENAME(3)

basename - Returns trailing name component of path

SYNOPSIS
string basename (string $path, [string $suffix]) DESCRIPTION
Given a string containing the path to a file or directory, this function will return the trailing name component. PARAMETERS
o $path - A path. On Windows, both slash ( /) and backslash ( ) are used as directory separator character. In other environments, it is the forward slash ( /). o $suffix - If the name component ends in $suffix this will also be cut off. RETURN VALUES
Returns the base name of the given $path. EXAMPLES
Example #1 basename(3) example <?php echo "1) ".basename("/etc/sudoers.d", ".d").PHP_EOL; echo "2) ".basename("/etc/sudoers.d").PHP_EOL; echo "3) ".basename("/etc/passwd").PHP_EOL; echo "4) ".basename("/etc/").PHP_EOL; echo "5) ".basename(".").PHP_EOL; echo "6) ".basename("/"); ?> The above example will output: 1) sudoers 2) sudoers.d 3) passwd 4) etc 5) . 6) NOTES
Note basename(3) operates naively on the input string, and is not aware of the actual filesystem, or path components such as " ..". Note basename(3) is locale aware, so for it to see the correct basename with multibyte character paths, the matching locale must be set using the setlocale(3) function. SEE ALSO
dirname(3), pathinfo(3). PHP Documentation Group BASENAME(3)
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