Bash Shell脚本使用mdfind搜索文件

Question

I have a folder of about 350 images (they are scanned recipes). To make finding them easier, I have written a search program in bash shell script. I have bash version 3.2 on Mac OS X 10.8 Mountain Lion.

The basic idea of my program:

1. Ask the user for search terms (using osascript).
2. Search the file (names) for the search terms, using mdfind.
3. Send the matching files to ln (through xargs).
4. Make a hardlink of matching files in a "results" directory. This directory is contained within the same folder of images (this directory is cleaned at the beginning of the program).

What the directories look like:

+Recipes
  -files
  -files
  -files
  +.search
     -search (shell script)
     +results
        -links
        -links

Here's my code:

#!/bin/bash
#
# Search program for recipes.
# version 2

# Clean out results folder
rm -rf ~/Google\ Drive/Recipes/.search/results/*

# Display the search dialog
query=$(osascript <<-EOF
        set front_app to (path to frontmost application as Unicode text)
        tell application front_app to get text returned of (display dialog "Search     for:" default answer "" with title "Recipe Search")
EOF)

# If query is empty (nothing was typed), exit
if [ "$query" = "" ]
then
    exit
fi

echo "Searching for \"$query\"."

# Search for query and (hard) link. The output from 'ln -v' is stored in results
# 'ln' complains if you search for the same thing twice... mdfind database lagging?
results=$(mdfind -0 -onlyin ~/Google\ Drive/Recipes/ "$query" | xargs -0 -J % ln -fv % ~/Google\ Drive/Recipes/.search/results)

if [ "$results" ]
then
    # Results were found, open the folder
    open ~/Google\ Drive/Recipes/.search/results/
else
    # No results found, display a dialog
    osascript <<-EOF
        beep
        set front_app to (path to frontmost application as Unicode text)
        tell application front_app to display dialog "No results found for \"" & "$query" & "\"." buttons "Close" default button 1 with icon 0
    EOF
fi

It works fine—the first time. If you search for the same thing twice, it breaks.

Explanation: let's say I search for "chicken". 34 files match, and hard links are made in the results directory.

Now, I run the program again, and search for the same thing—"chicken". The directory is emptied (by rm ). But now, the finding/linking stops working—only 6 or 7 recipes will be linked. What seems to be happening is that mdfind is finding the results in the search directory, after they have been deleted , and then ln can't make links. But it doesn't find the main files... I get

ln: ~/Google Drive/Recipes/.search/results/recipe.jpg: no such file or directory

I looked at mdfind used for creating symlinks not working as expected ; they have a similar problem (but no help).

Thanks for any help... this has been annoying me for a long time.

Answer 1

You can re-index directories or files with mdimport .

$ touch aa
$ mdfind -onlyin . -name aa
/Users/lauri/Desktop/aa
$ rm aa
$ mdimport .
$ mdfind -onlyin . -name aa
$ 

Spotlight doesn't index directories that start with a period, so you could just rename the .search directory.

Answer 2

The Spotlight commands use a cached index of the file contents. I don't know of any way to force mdfind not to do so. The brute force approach is to clear the cache with mdutil -E after removing the files, but you may not want to do that.