remove test post in prep for porting
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title: moving images two
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image:
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src: 2026/cormorant.jpg
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alt: "Image unrelated to post. A cormorant, a type of black waterfowl, poses with wings spread on a buoy in Puget Sound. Off to the left, another bird floats."
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tags:
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- gallery
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- software
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- some
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- more
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- tags
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---
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## problem statement
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today I decided to finally clean up the `assets/img` directory for this site. Since 2022, when I started this project, I've just been adding images directly to that directory with no further segmentation - messy of me, I know! It's gotten unwieldy and I'm starting to get worried about generic names leading to duplicates at some point, particularly for the non-gallery images where I have a tendency to [use](/stationery-exchange) [lots](/favorite-git-flag) [of](/trans-networks) [mushroom](/no-politics) [images](/domain-and-site-setup).
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so it's time to move them into year-based folders. Let's talk about how I did that. `bash` away!
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(want to [skip right to the completed script?](#result))
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## find
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let's start with the basics: a list of posts. `find` gets us everything under a specific directory - in this case, the `_posts` directory. We can filter out the directories a few different ways, but I piped the `find` output through a basic `grep` looking for `.md` in the filename.
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```sh
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for FILE in $(find _posts | grep .md)
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do
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# TBD
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done
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```
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## grep
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`grep` can also help us get image names with the regex `"name:.+jpg|png"`. I add `name:` to the regex because there are *very occasionally* images that aren't the featured image for the post, and those don't fit the pattern of `name: <img>`. Since there's so few of those, I ended up handling them manually.
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to make `grep` work with regex, it needs the `-E` flag.
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```sh
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# gives us
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# name: <img>
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# note the 4 spaces at the beginning of the line
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IMAGE_LINE=$(cat $FILE | grep -E "name:.+jpg|png$")
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```
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## cut
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that output gets us the full line of text that includes the image filename. Let's trim out what we actually want.
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below, `-d` sets a delimiter, and `-f` chooses what field we want to return. Because there's 4 spaces before `name`, our field index is actually pretty high - `cut` is creating 4 empty strings.
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```sh
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IMAGE=$(echo $IMAGE_LINE | cut -d ' ' -f 6 -)
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```
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or, for brevity:
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```sh
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IMAGE=$(cat $FILE | grep -E "name:.+jpg|png$" | cut -d ' ' -f 6 -)
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```
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with `cut`, we can also get the year of the post:
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```sh
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YEAR=$(echo $FILE | cut -d '/' -f 2 -)
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```
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## sed
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there's two major things we need to do with the information we've gathered:
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1. replace the image filename in-place in the post's markdown file
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1. move the image file from its original location into a new directory
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we can do replacement with `sed`, where our pattern should be something like this: `s/$IMAGE/$YEAR\/&\` (the `&` subs in the found string - in this case `$IMAGE`). We could also use comma separators if we don't want to escape the slash, like `s,$IMAGE,$YEAR/&,` - I did this for ease of reading.
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by default, `sed` prints to standard output, so we'll tell it to edit in-place instead with `-i`. Here's our full `sed` command:
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```sh
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sed "s,$IMAGE,$YEAR/&," -i $FILE
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```
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## mving and shaking
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(my mom thinks I'm funny.)
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now we'll handle moving the image file from its original location into a new directory. let's create our image paths, source and destination:
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```sh
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IMG_DIR=assets/img
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NEW_IMAGE=$IMG_DIR/$YEAR/$IMAGE
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IMAGE=$IMG_DIR/$IMAGE
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```
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trying to `mv` the images will immediately cause problems, because the year directories don't exist yet. A simple check gets us past that:
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```sh
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if [ ! -d $IMG_DIR/$YEAR ]
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then
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mkdir $IMG_DIR/$YEAR
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fi
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```
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finally, we can `mv` the image:
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```sh
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mv $IMAGE $NEW_IMAGE
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```
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## result
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here's our final script:
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```sh
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for FILE in $(find _posts | grep .md)
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do
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# parse image and year info
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IMAGE=$(cat $FILE | grep -E "name:.+jpg|png$" | cut -d ' ' -f 6 -)
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YEAR=$(echo $FILE | cut -d '/' -f 2 -)
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# replace in-place in file
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sed "s,$IMAGE,$YEAR/&," -i $FILE
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# path creation
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IMG_DIR=assets/img
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NEW_IMAGE=$IMG_DIR/$YEAR/$IMAGE
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IMAGE=$IMG_DIR/$IMAGE
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# create dir for year if it doesn't exist
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if [ ! -d $IMG_DIR/$YEAR ]
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then
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mkdir $IMG_DIR/$YEAR
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fi
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# move image
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mv $IMAGE $NEW_IMAGE
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done
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```
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questions? errors? [ping me!](/contact)
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