Commandline basics

RKD command-line usage is highly inspired by GNU Make and Gradle, but it has its own extended possibilities to make your scripts smaller and more readable.

  • Tasks are prefixed always with “:”.
  • Each task can handle it’s own arguments (unique in RKD)
  • “@” allows to propagate arguments to next tasks (unique in RKD)

Tasks arguments usage in shell and in scripts

Executing multiple tasks in one command:

rkd :task1 :task2

Multiple tasks with different switches:

rkd :task1 --hello  :task2 --world --become=root

Second task will run as root user, additionally with --world parameter.

Tasks sharing the same switches

Both tasks will receive switch “–hello”

# expands to:
#  :task1 --hello
#  :task2 --hello
rkd @ --hello :task1 :task2

# handy, huh?

Advanced usage of shared switches

Operator “@” can set switches anytime, it can also clear or replace switches in NEXT TASKS.

# expands to:
#   :task1 --hello
#   :task2 --hello
#   :task3
#   :task4 --world
#   :task5 --world
rkd @ --hello :task1 :task2 @ :task3 @ --world :task4 :task5

Written as a pipeline (regular bash syntax)

It’s exactly the same example as above, but written multiline. It’s recommended to write multiline commands if they are longer.

rkd @ --hello \
    :task1 \
    :task2 \
    :task3 \
    @ --world \
    :task4 \