Is there a better way to run a command N times in bash?

Question

I occasionally run a bash command line like this:

n=0; while [[ $n -lt 10 ]]; do some_command; n=$((n+1)); done

To run some_command a number of times in a row -- 10 times in this case.

Often some_command is really a chain of commands or a pipeline.

Is there a more concise way to do this?

Answer 1

for ((n=0;n<10;n++)); do some_command; done

Answer 2

for run in {1..10}
do
  command
done

Answer 3

How about the alternate form of for mentioned in (bashref)Looping Constructs?

Answer 4

Maybe this link may help http://stackoverflow.com/questions/2754367/run-program-multiple-times-using-one-line-shell-command

Answer 5

For one, you can wrap it up in a function:

function manytimes {
    n=0
    times=$1
    shift
    while [[ $n -lt $times ]]; do
        $@
        n=$((n+1))
    done
}

Call it like:

$ manytimes 3 echo "test" | tr 'e' 'E'
tEst
tEst
tEst

Answer 6

Another form of your example:

n=0; while (( n++ < 10 )); do some_command; done