Is there a good bash scripting tutorial anywhere? I'm trying to write a script that will figure out if the parameter I passed to it ends in .gz .tar or something else, but first I need to convert the string to lowercase... AND NOBODY KNOWS HOW!!!!!!

I've been searching for an hour now and nobody seems to know how to do this stupid little thing!!!! Every time I type

$myvar=${$myWord//'A'/'a'}

I get the error: "bad substitution"


bad substitution MY F****** A** !!!!!!!!!!!!!!!!!!!!!!!!!!

I WISH I COULD JUST WRITE C++ CODE AND USE IT AS SCRIPT!!!!!!!!!

$myvar=${echo $myWord | tr '[A-Z]' '[a-z]'}

St. Anger round my neck
St. Anger round my neck
He never gets respect
St. Anger round my neck

St. ANGER round my neck
He never gets RESPECT
ST. ANGER ROUND MY NECK
HE NEVER GETS RESPECT

F*** it all and no regrets
I hit the lights on these dark sets
Medallion noose
St. ANGER round my neck

I Feel my world shake
Like and earthquake
Hard to see clear
Is it me? Is it fear?

I'M MADLY IN ANGER WITH BASH
I'M MADLY IN ANGER WITH BASH
I'M MADLY IN ANGER WITH BASH
I'M MADLY IN ANGER WITH BASH


In other words... I GOT THE SAME ERROR!!!!!!!! ARGGGGGGGGGGGG!!!!!

This might come in handy?

http://www.tldp.org/LDP/abs/html/

I've been string at that webpage for a while now... not helping

$myvar = `echo $myWord | tr [:upper:] [:lower:]`

#!/bin/bash

if [ $# -eq 0 ]
then
echo "Required parameter not provided."
else
fFile=$1

$fFile = `echo $fFile | tr [:upper:] [:lower:]`
echo $fFile
fi


then i type in:
lowercase FWAA

and get error:
/usr/bin/lowercase: line 9: FWAA: command not found

echo $fFile | tr [:upper:] [:lower:]

gives me the lowercase, but

$fFile = 'echo $fFile | tr [:upper:] [:lower:]'

gives me

/usr/bin/lowercase: line 8: FWAA: command not found
FWAA

NOT FAIR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

For anyone reading this well after I've had this problem and thrown a cursing fit... the entire problem is that I was using ' instead of `

Make sure you use the character that is below the ~ on your keyboard!!