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for file in prefix*; do mv "$file" "${file#prefix}"; done;

The for loop iterates over all files with the prefix. The do removes from all those files iterated over the prefix.

Here is an example to remove "bla_" form the following files:

bla_1.txt
bla_2.txt

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	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	# Creating a Digital Ocean droplet running Rails + Postgres with persistant storage and https
	#--------------------------------------------------------------------------------------------

	# For your ctrl-D pleasure...
	# SERVER_IP
	# APP_NAME
	# RAILS_SECRET (generate with `rails secret`)
	# ADMIN_EMAIL

	#!/bin/bash
	printf "
	####################################################################
	# Tested with following setup: #
	# Ubuntu 20.04 (LTS) x64 droplet on digitalocean with a cloudflare #
	# managed domain pointing to the droplet's external IP. Please #
	# follow the steps commented in init.sh: #
	####################################################################\n"
	# ssh root@1.2.3.4 (IP of droplet)
	# wget https://gist.github.com/ginmaster/c6d11697c4fa67442889f379380ba6c0/raw/d58f803e731eadf3d2bb0951ff1c0e6d7d18ef69/init.sh

	NB. Core logic for a tiny editor in J.
	NB. No select/copy/paste (in this gist), but it does support multiple cursors.
	NB. This started as the code for editing a single line of text, but I'm now
	NB. using three copies simultaneously: one for a single token, one for
	NB. boxed tokens on a line, and one for boxed lines in a buffer.
	coclass 'ed'

	init =: {{
	B =: '' NB. the buffer to edit.
	C =: 0 NB. cursor position(s)

	// This is a documented version of the build.gradle file from RemotePreferences:
	// https://github.com/apsun/RemotePreferences/blob/master/library/build.gradle.kts
	//
	// It aims to explain exactly WTF is going on when you inevitably copy-paste
	// someone's build.gradle from the internet and can't figure out why it's not
	// working.
	//
	// It contains, to the best of my knowledge, the best practices as of Oct 2023 for
	// building an Android library and publishing it to OSSRH (Maven Central).
	//