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Try:
if [[ condition a || condition b ]]
then
...

How about adding a space before the second double quote?

The key word is "string" as opposed to pattern. Fgrep, or grep -F doesn't do any regular expression matching. Consider searching for the string .*.* in a file:


grep -F ".*.*" filename
grep...

Try:

read -p 'Enter any number, please: ' number
sleep 1
number=$( tr -d 0-9 <<< "$number" )
test -z "$number" &&
echo "Thank you" ||
echo "This is not a number"Actually you could...