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Tags: delete   text   rename  
Link: 🔍 See Original Answer on Ask Ubuntu 🔗

Title: How to remove text from a folder name after a certain word
ID: /2020/06/12/How-to-remove-text-from-a-folder-name-after-a-certain-word
Created: June 12, 2020    Edited:  June 13, 2020
Upload: November 24, 2022    Layout:  post
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Here’s the code you need plus some test data you don’t need:


# NAME: truncate-dname
# PATH: $HOME/askubuntu/
# DESC: Answer for:
# DATE: June 12, 2020

echo ==============  CREATE TEST DATA  ==================
mkdir -p dnames
cd dnames
mkdir -p "Song Band - Song Name download 9038450985934853434"
mkdir -p "Music List download dkjge3j6lk45j45756567"
mkdir -p "Video Chart download 4k645jel43k5yk574yryryrrtyryrryryrt"

echo ==============  RENAME DIRECTORIES  ================
for old_name in ./*
    new_name="${old_name% download*}"
    mv -v "$old_name" "$new_name"

echo ==============  DELETE TEST DATA  ==================
cd ..
rm -rf dnames

When you run the script you get this:

$ truncate-dname
============== CREATE TEST DATA ==================
Music List download dkjge3j6lk45j45756567
Song Band - Song Name download 9038450985934853434
Video Chart download 4k645jel43k5yk574yryryrrtyryrryryrt
============== RENAME DIRECTORIES ================
'./Music List download dkjge3j6lk45j45756567' -> './Music List'
'./Song Band - Song Name download 9038450985934853434' -> './Song Band - Song Name'
'./Video Chart download 4k645jel43k5yk574yryryrrtyryrryryrt' -> './Video Chart'
============== DELETE TEST DATA ==================
Music List  Song Band - Song Name  Video Chart

The key operation you want is to extract sub-string within string before a search string. For example:

$ a="Song Band - Song Name download 9038450985934853434"

$ b="${a% download*}"

$ echo $b
Song Band - Song Name

This process is a little tricky if the word “download” appears in the song title so it’s in the filename twice:

$ c="People keep downloading my songs download 9038465489643541"

$ d="${c%% download*}"

$ echo $d
People keep

$ d="${c% download*}"

$ echo $d
People keep downloading my songs

When you have two %% it deletes everything after the first “download” occurrence which you don’t want. So in this case you want to just use a single % so the last “download” is the cut off point.

There is also the # operation which searches in the opposite direction you definitely don’t want:

$ c="People keep downloading my songs download 9038465489643541"

$ e="${c##* download}"

$ echo $e

$ e="${c#* download}"

$ echo $e
ing my songs download 9038465489643541

Here is a thorough reference.

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