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That's not precisely what I suggested. You left out some characters as well as leaving out two important steps.

You never said x was a variable, either. I'll have to change it for that.

awk...

using cut


grep -n -i -w "linux from the text" unix.txt | cut -d":" -f1 > newfile.txt

Try this :

grep -n -i -w "linux from the text" unix.txt | awk -F ":" '{print $1}' > newfile.txt

awk -vVar="linux from the text" 'tolower($0)~Var{print NR}' file > new.file

put the below lines in the .profile or .bashrc file ( under your home directory )


echo "Hello $LOGNAME"
echo "Welcome to $HOSTNAME"

x=`echo "hello123" | tr -dc '[0-9]' | wc -c`
And don't put spaces around the equal sign.