Run a PHP file every 5 seconds using Shell Script

Solution:

Try this:

#!/bin/bash
while true; do
    sleep 5 &
    php /home/user/www/run.php &
    wait
done
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wait (with no arguments) waits for all background jobs to complete, so the loop will block until the longer of the sleep and php processes completes.

Demonstrating the SECONDS variable

rand() { echo $(( RANDOM % $1 )); }

for i in {1..10}; do
    start=$SECONDS
    r=$(rand 10)
    echo "iteration $i, sleeping for $r seconds"
    sleep $r
    end=$SECONDS
    if ((end - start < 5)); then
        n=$((5 - (end - start)))
        echo "sleep for $n seconds"
        sleep $n
    fi
done

# or more simply by assigning to SECONDS
for i in {1..10}; do
    SECONDS=0
    r=$(rand 10)
    echo "iteration $i, sleeping for $r seconds"
    sleep $r
    duration=$SECONDS
    if ((duration < 5)); then
        n=$((5 - duration))
        echo "sleep for $n seconds"
        sleep $n
    fi
done
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Certainly more complex than usingwait

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