Broken down:for (`locate $ARGV[0]`) { chop; -M and $f{$_}=($stat _)[9]; } for $x (sort { $f{$a} <=> $f{$b} } keys %f) { printf "%s $x\n", scalar localtime($f{$x}); }
Hope that helped. I know that this is probably really basic to most people (even the original poster) but somebody may get some use out of my verbosity. :)for $y (`locate $ARGV[0]`) { ## Run the system command locate, and send it the first ## argument that was sent to the script. This will ## return a list of lines (files), which gets stored into $_ ## (because we did not give the for loop a variable) chop; ## We need to chop the newline off for the following ## tests to work. With no argument, it chops $_ -M and $f{$_}=(stat _)[9]; ## -M returns the last modification time. With no argument, ## it checks $_. We do this because locate may not return ## a valid file. Perl actually does a stat behind the ## scenes to get this info, and saves it away. We use the ## 'and' to only do the next part of the statement if ## -M returns something. ## (stat _)[9] - the underscore tells perl not to check ## the file again, but to use the same information it ## saved when it made the last check (which was -M) ## Stat returns a list, but we only want the 10th ## element (in position 9, count from 0) which is the ## modification date (similar to -M). We put this ## time into the hash %f, using the filename (which is ## still set as $_ from before) as a key. } ## That's it, now the next line of locate's output is ## parsed, until we are done. for $x (sort { $f{$a} <=> $f{$b} } keys %f) { ## This says to sort all the keys of the hash %f, ## which are the names of the file. We use a custom ## sort by comparing the values of the hash, which ## are the modification times. $a and $b are special ## variables perl uses inside sort blocks, and the ## spaceship operator <=> allows us to compare ## the times numerically. This sorted list is then ## passed to the for loop, with $x receiving the ## keys of %f in the newly sorted order. printf "%s $x\n", scalar localtime($f{$x}); ## We print it out. No particular reason to use printf - ## I just happen to like it. The scalar and localtime ## converts the value stored in $f{$x} (the modification ## time) into something prettier to read. (the time is ## stored internally as a 32-bit number, i.e. 958740893 ## which is not very pretty at all.) }
In reply to RE: RE: RE: RE: Find and check timestamps of files.
by turnstep
in thread Find and check timestamps of files.
by Malach
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