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| cut -b-9
No need for delimiters if Youre writing bytes (chars).

alias rm='rm -i'
Add it to Your /etc/profile

sed "s/.*@//g" inputfile

#!/bin/bash
echo "select 'rm -rf '||name from v\$datafile;" | sqlplus "/ as sysdba" | grep "^rm -rf" > file1
echo "select 'rm -rf '||name from v\$controlfile;" | sqlplus "/ as sysdba" | grep "^rm...

This should do:

#!/bin/bash

count=`find -name "*.dat" | wc -l`
iterations=$(($count/1000))

for j in $(seq $iterations); do
dir="dir$j"
mkdir $dir
mv $j???.dat...

sed -n '/file:/s/^.*file:\/\/\(.*dat\).*(score \(.*\),.*/\1 \2/p' FILENAME

You're almost there... small changes:
change case 1) to:
echo -n "Enter a word: "
read word
echo -n "Enter the meaning: "
read meaning
echo "$word means $meaning" >>...

Above is true, when Your number is in this format:
0,1
It's not working when You have dot in number (like in bc standard):
0.1

Try this:
if [ `echo "$1 > $2" | bc -l` -eq 1 -a `echo "$1 < $3" | bc -l` -eq 1 ]; then
echo OK
else
echo False
fi

Most probably - script is trying to make directory somewhere, where it has no permissions to do that.
Try adding
cd /home/user01/exercise
before mkdir.
And change, just for test, cron time to...

Why did You use authorized_keys2 file on server side? Default sshd setting uses authorized_keys (without trailing "2"). Maybe that's the problem...