You can pipe the script's output through a loop that prefixes the current date and time:

./script.sh | while IFS= read -r line; do echo "$(date) $line"; done >>/var/log/logfile 

If you'll be using this a lot, it's easy to make a bash function to handle the loop:

adddate() { while IFS= read -r line; do printf "%s %s\n" "$(date)" "$line"; done } ./thisscript.sh | adddate >>/var/log/logfile ./thatscript.sh | adddate >>/var/log/logfile ./theotherscript.sh | adddate >>/var/log/logfile 

You can pipe the script's output through a loop that prefixes the current date and time:

./script.sh | while IFS= read -r line; do printf '%s %s\n' "$(date)" "$line"; done >>/var/log/logfile 

If you'll be using this a lot, it's easy to make a bash function to handle the loop:

adddate() { while IFS= read -r line; do printf '%s %s\n' "$(date)" "$line"; done } ./thisscript.sh | adddate >>/var/log/logfile ./thatscript.sh | adddate >>/var/log/logfile ./theotherscript.sh | adddate >>/var/log/logfile 

You can pipe the script's output through a loop that prefixes the current date and time:

./script.sh | while IFS= read -r line; do echo "$(date) $line"; done >>/var/log/logfile 

If you'll be using this a lot, it's easy to make a bash function to handle the loop:

adddate() { while IFS= read -r line; do echo "$(date) $line" done } ./thisscript.sh | adddate >>/var/log/logfile ./thatscript.sh | adddate >>/var/log/logfile ./theotherscript.sh | adddate >>/var/log/logfile 

You can pipe the script's output through a loop that prefixes the current date and time:

./script.sh | while IFS= read -r line; do echo "$(date) $line"; done >>/var/log/logfile 

If you'll be using this a lot, it's easy to make a bash function to handle the loop:

adddate() { while IFS= read -r line; do printf "%s %s\n" "$(date)" "$line"; done } ./thisscript.sh | adddate >>/var/log/logfile ./thatscript.sh | adddate >>/var/log/logfile ./theotherscript.sh | adddate >>/var/log/logfile