Loop over files (Bash): verschil tussen versies
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| Regel 3: | Regel 3: | ||
== Examples == | == Examples == | ||
| − | Start simple | + | === Start simple === |
<pre> | <pre> | ||
| Regel 14: | Regel 14: | ||
done | done | ||
</pre> | </pre> | ||
| + | |||
| + | === Operate on each file === | ||
Create links to all files in this folder, and put those links in another folder: | Create links to all files in this folder, and put those links in another folder: | ||
Versie van 8 aug 2022 10:07
This is cool: You can loop over files in a directory and do stuff with it!
Examples
Start simple
#!/bin/bash cd ~/images-tmp for file in * do echo "File name: $file" done
Operate on each file
Create links to all files in this folder, and put those links in another folder:
for file in *.jpg
do
source="${PWD}/${file}"
link="/var/www/media.example.com/tmp2/$file"
echo " Path+file: $source - Destination: $link"
ln -s "$source" "$link"
done
Including shopt
I've seen the shopt statements in examples from others. Turned out I really need them. And yes: This is not the most elegant or efficient script. It works.
################################################################################
# create_all_links_from_directory()
################################################################################
#
create_all_links_from_directory()
{
#
# First loop for .jpg
#
for file in *.jpg
do
source="${PWD}/${file}"
link="${root}all-product-images/$file"
echo " Source: $source Link: $link"
ln -s "$source" "$link"
done
# Second loop for .png
#
for file in *.png
do
source="${PWD}/${file}"
link="${root}all-product-images/$file"
echo " Source: $source Link: $link"
ln -s "$source" "$link"
done
}
################################################################################
# Loop through directories
################################################################################
#
# From most to least relevant?
########################################
#
# * It seems like nitpicking, but there actually are some cases where the
# overall quality is better when doing this in the right order: Do
# "without logo" before "with logo"
#
#
# Start here
########################################
#
root="/var/www/media.example.com/"
shopt -s extglob
shopt -s nullglob
cd ${root}custom-jpg-without-logo; create_all_links_from_directory
cd ${root}custom-jpg-logo; create_all_links_from_directory
cd ${root}tools-jpg-without-logo; create_all_links_from_directory
cd ${root}tools-jpg-logo; create_all_links_from_directory
cd ${root}misc-jpg-without-logo; create_all_links_from_directory
cd ${root}misc-jpg-logo; create_all_links_from_directory
cd ${root}promotion-jpg-without-logo; create_all_links_from_directory
cd ${root}promotion-jpg-logo; create_all_links_from_directory