How to delete multiple folders in parallel?

Question

I have two directories on the same level and I can do:

rm -rf dir1/; rm -rf dir2/

but they will be running sequentially, how could I remove them in parallel? is there a generic solution too which allows me to extend to many folders?

Update

The directories may be deeply nested containing other directories and so on.

Answer 1

Run the commands in background

rm -rf dir &; rm -rf dir2 &;

syntax

long_command with arguments > redirection &

you can capture any messages by redirecting the command output to a file.

This links will help ==> http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html

Edit :

The question title & given example gives an impression like the issue is very small. But an added bounty showing the seriousness of the issue.

It would be better if you specify the nature of your files. However, I am providing some split based deletion which can implemented as parallel executions You can try below options based on your requirement.

deleting files by size

find /yourpath/folder1 -size +1048576 -exec rm -f {} \; &
find /yourpath/folder2 -size +1048576 -exec rm -f {} \; &

deleting files by extension

find extensions by using below command

ls -l /yourpath/folder1 | awk '{print $9}' | awk -F. '{print $(NF)}' |sort |uniq

you may get result like

.txt
.log
.tmp
.zip

now, delete the files based on extensions

find yourpath/folder1 -name '*.txt' -exec rm {} \; &
find yourpath/folder1 -name '*.tmp' -exec rm {} \; &
find yourpath/folder1 -name '*.log' -exec rm {} \; &
find yourpath/folder2 -name '*.txt' -exec rm {} \; &
find yourpath/folder2 -name '*.tmp' -exec rm {} \; &
find yourpath/folder2 -name '*.log' -exec rm {} \; &

deleting files by modified time

below command tries to delete files older than 5 days.

find yourpath/folder1 -mtime +5 -exec rm {} \;

OR

find yourpath/folder2 -mtime +5 |xargs rm 

deleting folder & it's sub folders including it's files

find foldername -exec rm -rf {} \; &