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#!/bin/bash
echo -n "Hurry up and type something! > "
if read -t 10 response ; then
echo "Greate, you made it in time!"
else
echo "sorry, you are too slow!"
fi
I have written above code in terminal and got error "read: Illegal option -t".
227
The read command reads one line from standard input and assigns the values of each field in the input line to a shell variable using the characters in the IFS (Internal Field Separator) variable as separators.
$? is the exit status of the most recently-executed command; by convention, 0 means success and anything else indicates failure. That line is testing whether the grep command succeeded. The grep manpage states: The exit status is 0 if selected lines are found, and 1 if not found.
These are positional arguments of the script. Executing ./script.sh Hello World. Will make $0 = ./script.sh $1 = Hello $2 = World. Note. If you execute ./script.sh , $0 will give output ./script.sh but if you execute it with bash script.sh it will give output script.sh .
Bash supports -t, so it looks like you're trying to execute it with sh or some other shell, which is odd, since you have the correct shebang.
Make sure you run it with ./script or path_to_script/script. If you just run it in the terminal, first start bash.
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