wget：使用 .jpg 扩展名保存

Question

I made this script to download .jpg files from a database:

for (( i = 1; i <= 9; i +=1))
do
wget http://archives.cg66.fr/mdr/index.php/docnumserv/getSubImage/0/0/0/-archives-009NUM_Etat_civil-Images---LLUPIA-2E1700_1702-FRAD066_2E1700_1702_000$i.jpg/0/100/0/100/100/100/100/100/2300/1500/0/100
done

because of the "/0/100/0/100/100..." after the .jpg extension, the result is:

9 files named: 100 , 100.1, 100.2, 100.3 ... 100.9

and I would find a way to have 9 .jpg files named 0001.jpg, 0002.jpg, 0003.jpg ... 0009.jpg

Could you give me some help or advice?

Answer 1

You coud try this way:

~$ URL1="http://archives.cg66.fr/mdr/index.php/docnumserv/getSubImage/0/0/0/-archives-009NUM_Etat_civil-Images---LLUPIA-2E1700_1702-FRAD066_2E1700_1702"
~$ URL2="0/100/0/100/100/100/100/100/2300/1500/0/100"
~$ for I in $(seq -w 0001 0009)
   do
      wget -O "${I}.jpg" "${URL1}_${I}.jpg/${URL2}"
   done

To populate the i variable with three leading zeros I use seq -w 0001 0009 . To download images with the right filename I use wget -O "${i}.jpg" ${URL} . This work also with more than 9 images, eg. to produce a sequence of numbers from 1 to 999 with the leading zeros ( 0001 ... 0099 ... 0999 ) the command becomes seq -w 0001 0999 .

See man seq and man wget for the documentation (online here and here ).

Of course the URL can't contain leading zeros between the variable ${i} and the underscore, otherwise the wget command will return an error page.

For this reason I changed the URL from this: ..._1702_000$i.jpg/0/100/... to this: ..._1702_${i}.jpg/0/100/... .

The downloaded files:

~$ ls -l 
total 20404
-rw-r--r-- 1 ale ale 2408227 Oct  9 22:38 0001.jpg
-rw-r--r-- 1 ale ale 2422199 Oct  9 22:38 0002.jpg
-rw-r--r-- 1 ale ale 2330667 Oct  9 22:38 0003.jpg
-rw-r--r-- 1 ale ale 2162542 Oct  9 22:38 0004.jpg
-rw-r--r-- 1 ale ale 2579155 Oct  9 22:38 0005.jpg
-rw-r--r-- 1 ale ale 2175118 Oct  9 22:38 0006.jpg
-rw-r--r-- 1 ale ale 2174325 Oct  9 22:38 0007.jpg
-rw-r--r-- 1 ale ale 2421311 Oct  9 22:38 0008.jpg
-rw-r--r-- 1 ale ale 2202587 Oct  9 22:38 0009.jpg

---

EDIT: Another alternative. First I create a file with list URL:

~$ URL1="http://archives.cg66.fr/mdr/index.php/docnumserv/getSubImage/0/0/0/-archives-009NUM_Etat_civil-Images---LLUPIA-2E1700_1702-FRAD066_2E1700_1702"
~$ URL2="0/100/0/100/100/100/100/100/2300/1500/0/100"
~$ for I in $(seq -w 0001 0009)
   do
      echo "${URL1}_{${I}}.jpg/${URL2}" >> url_list.txt
   done

The loop outputs URLs formatted this way: ..._1702_{${I}}.jpg/0/100... in order to save files with the format: '#1.jpg' .

~$ xargs -P 10 -n 1 curl -o '#1.jpg' < url_list.txt

However, this solution may overload the webserver. In case of troubles, I think might be helpful to use the wget solution adding the option --limit-rate=amount to limit download speed to amount bytes per seconds. Add k for kilobytes, M for megabytes.

References:

• Command parallelization and fetching one argument from file ( xargs -n 1 -P {number_files} ): https://serverfault.com/a/722874
• Saving file with custom name ( curl -o '#1.jpg' ): https://unix.stackexchange.com/a/91574