I have a piece of code like this:

count=0 until [ -f $filename -o $count -ge 60 ] do count=$((count+1)) sleep 1 done

I know [ -f $filename -o $count -ge 60 ] is a test command, "-f $filename" tests if the file exists or not, "$count -ge 60" tests if count is greater than or equal to 60, what does "-o" mean?

I googled, can't find the answer, anyone can help? Thanks in advance.

I have a piece of code like this:

count=0
until [ -f $filename -o $count -ge 60 ]
do
  count=$((count+1))
  sleep 1
done

I know [ -f $filename -o $count -ge 60 ] is a test command, "-f $filename" tests if the file exists or not, "$count -ge 60" tests if count is greater than or equal to 60, what does "-o" mean?

I googled, can't find the answer, anyone can help?