BASH shell scripting file parsing [newbie]

Question

I am trying to write a bash script that goes through a file line by line (ignoring the header), extracts a file name from the beginning of each line, and then finds a file by this name in one directory and moves it to another directory. I will be processing hundreds of these files in a loop and moving over a million individual files. A sample of the file is:

ImageFileName    Left_Edge_Longitude    Right_Edge_Longitude   Top_Edge_Latitude  Bottom_Edge_Latitude

21088_82092.jpg:  -122.08007812500000  -122.07733154296875    41.33763821961143    41.33557596965434

21088_82093.jpg:  -122.08007812500000  -122.07733154296875    41.33970040427444    41.33763821961143

21088_82094.jpg:  -122.08007812500000  -122.07733154296875    41.34176252364274    41.33970040427444

I would like to ignore the first line and then grab 21088_82092.jpg as a variable. File names may not always be the same length, but they will always have the format digits_digits.jpg

Any help for an efficient approach is much appreciated.

Answer 1

这应该使您开始：

$ tail -n +2 input | cut -f 1 -d: | while read file; do test -f $dir/$file && mv -v $dir/$file $destination; done

Answer 2

You can construct a script that will do something like this, then simply run the script. The following command will give you a script which will copy the files from one place to another, but you can make the script generation more complex simply by changing the awk output:

pax:~$ cat qq.in
ImageFileName     Left_Edge_Longitude  Right_Edge_Longitude
21088_82092.jpg:  -122.08007812500000  -122.07733154296875
21088_82093.jpg:  -122.08007812500000  -122.07733154296875
21088_82094.jpg:  -122.08007812500000  -122.07733154296875

pax:~$ awk -F: '/^[0-9]+_[0-9]+.jpg:/ {
        printf "cp /srcdir/%s /dstdir\n",$1
    } {}' qq.in

cp /srcdir/21088_82092.jpg /dstdir
cp /srcdir/21088_82093.jpg /dstdir
cp /srcdir/21088_82094.jpg /dstdir

You capture the output of that script (the last three lines) to another file then that file is your script for doing the actual copies.