find all extensions than make directories of extensions using find command?

Turbocapitalist · 09-20-2020, 05:46 AM

Quote:

Originally Posted by berndbausch

You could, but only with a certain amount of contorsion.

A function would be rather easy.

Code:

#!/bin/bash

function checkdirectory() {
        filename=$1
        echo E=$filename
}

find . -type f -name '*' -print0 \
| while read -d '' file;
do
        checkdirectory $file
done

berndbausch · 09-20-2020, 05:51 AM

Quote:

Originally Posted by Turbocapitalist

A function would be rather easy.

I protest formally. This is not the same find command.

But of course you are right. You can put everything in the same file. I am sure there are many other ways for solving this.

I would like to warn OP. The script, if it works at all, only covers the narrow case that you described. If your problem is slightly different, you will have to rewrite the script.

Turbocapitalist · 09-20-2020, 06:03 AM

Quote:

Originally Posted by berndbausch

I protest formally. This is not the same find command.

Quite right. It is not convenient to export a shell function into -exec in find.

finalturismo · 09-21-2020, 03:01 PM

Quote:

Originally Posted by berndbausch

You could, but only with a certain amount of contorsion.

To avoid making a directory that exists already.

The ! in the first line is part of the syntax used to define the interpreter of this script.

The ! in the if condition negates the directory test, i.e. it means "not".

Contorsion, thats above my vocabulary capabilities even Google spell checker doesn't have that saved.

Makes you wonder if ancient canabalizm had any science behind it, like if i ate your brain would i gain any IQ points.

Anyway so i think iam going to setup a lab server for this so i dont blow out my 5+ TB of data XD.

Do you happen to have skype or anything? If so can you message it to me, i have been looking for a tutor and i dont mind paying a few bucks for some time.

boughtonp · 09-21-2020, 03:38 PM

Quote:

Originally Posted by finalturismo

Contorsion, thats above my vocabulary capabilities even Google spell checker doesn't have that saved.

Contortion is twisting one's body into strange positions - an accurate analogy for a Bash script that executes a find command that calls the same Bash script again.

(If Google can't solve a single-letter ~sion -> ~tion misspelling, you might want to use a real spell checker next time.)

pan64 · 09-22-2020, 01:52 AM

I have never heard about contortion as a programming technique, but it is definitely a living method.

find itself is probably used to look for something and not for creating directories, moving files and/or executing complex tasks (although it is not impossible). find is basically a read-only tool (therefore this is the best tool for a contortionist).

The script in post #11 is almost complete:

Code:

for filename in *                 # use shell globbing and/or while - if you want to
do
    extension=${filename##*.}     # obtain extension
    mkdir -p "$extension"         # there is no need to check, mkdir -p will do that automatically
    mv $filename $extension
done

using find instead of this loop makes the execution definitely slower, that will be the indication of hard work.

In more complex cases (when more calculation/check required) I would recommend perl/python or similar.

dugan · 09-22-2020, 05:37 PM

Yeah, I can't memorize the BASH string operators either.

Anyway, here' my attempt. It should be pretty efficient, but needs an up-to-date BASH.

Code:

#!/usr/bin/env bash

shopt -s globstar

declare -A extensions

for f in **/*; do
	if [ -f "$f" ]; then
		extensions["${f##*.}"]=1
	fi
done

for extension in "${!extensions[@]}"; do
	mkdir "$extension"
done

berndbausch · 09-23-2020, 06:56 AM

finalturismo, I don't know whether the Linuxquestions email feature is still working; I sent you a message but don't see it in the Sent folder. My Skype handle is like my Linuxquestions one.

MadeInGermany · 09-25-2020, 12:44 AM

Let's ensure that our filenames have a .ext

Code:

find . -name "*.?*" -type f ...

Code:

for f in **/*.?* ; do if [ -f "$f" ] ; then ...