repeater

A tool which repeats a command n amounts of time, with paralellisation and slight tweaks.

Test coverage: 75.7% 😌👏

Installation

go install github.com/baalimago/repeater@latest

Usage

Since v1.2.1, repeater will re-attempt the command until successful. A success is a command returning exit code 0. Set flag -retryOnFail=false if you simply wish to repeat the CMD -n amount of times, regardless of outcome.

Usecases:

• CRUD state using curl as fast as you have network sockets
• Paralellize repetitive shell-scripts
• Ghetto benchmarking

repeater \
    -n 100 `# repeat 100 times` \
    -w 10 ` # using 10 workers` \
    -output FILE `              # with command output written to FILE` \
    -progress BOTH `            # with progress written to BOTH STDOUT and FILE` \
    -file ./run_output `        # with FILE ./run_output` \
    -result ./run_result `      # with result (output + time taken) for each command` \
    curl example.com `          # command to repeat`

# This will print "this is increment: 1\nthis is increment: 2\n..."
repeater -n 100 -output STDOUT -progress HIDDEN -increment echo "this is increment: INC"

# Show all available flags
repeater -h

Benchmarks

repeater outperforms many other parallizers, including GNU parallel and xargs.

Run ./benchmark.sh to try out repeaters performance vs similar parallelization tools. You may benchmark any command that you want, simply run ./benchmark.sh <MAX RUNS> <YOUR COMMAND>. It will run the command with repeater, parallel and xargs and print the time taken for each by starting to repeat the command 10 times then 100, 1000, etc up until <MAX_RUNS>. Note that ./benchmark.sh will break if it detects and diffs in the output of the commands, so ensure the commands output is deterministic.