在 bash 脚本中终止 tail -f 命令

Question

i have the following script. i want to break the tail -f command using the ENTER key. but it is not working:\ please help.

tail -f /var/log/auth.log
while true 
do
read -s -n 1 key  
if [[ $key == $'\x0a' ]]
then
    #id=$(pidof tail) 
    #sudo kill -9 $id 
        
    
    fi
done

also tried this and but not working as well

while ! tail -f /var/log/auth.log
do
read -s -N 1 -t 1 key
if [[ $key == $'\x0a' ]];        # if input == ENTER key
then
    id=$(pidof tail)
    sudo kill -9 $id      
fi
done

Answer 1

If you want the rest of your script to operate while the tail is still going, you need to put the tail in the background. Using & does this.

tail -f /var/log/auth.log & tail_pid=$!  # store PID of tail in $tail_pid
read _                                   # read until there's a carriage return
kill "$tail_pid"                         # end the tail_pid process