cfunction
src/core/os.c on line 1104, column 1
(os/execute args &opt flags env)
Execute a program on the system and pass it string arguments.
`flags` is a keyword that modifies how the program will execute.
* :e - enables passing an environment to the program. Without :e,
the current environment is inherited.
* :p - allows searching the current PATH for the binary to execute.
Without this flag, binaries must use absolute paths.
* :x - raise error if exit code is non-zero.
* :d - Don't try and terminate the process on garbage collection
(allow spawning zombies).
`env` is a table or struct mapping environment variables to values.
It can also contain the keys :in, :out, and :err, which allow
redirecting stdio in the subprocess. These arguments should be
core/file values. Returns the exit status of the program.
(def [stdin-r stdin-w] (os/pipe))
(def [stdout-r stdout-w] (os/pipe))
# write the input that will be sent to sed
(:write stdin-w "hello world 1\nhello world 2")
(:close stdin-w)
(os/execute
@("sed" "s|world|janet|g")
:px
# the program reads from :in and writes to :out
{:in stdin-r :out stdout-w})
(:read stdout-r math/int32-max)
# => @"hello janet 1\nhello janet 2"
# feed two lines to sed, which replaces "world"
# with "janet", and read the modified results back(os/execute
@("/usr/bin/bash" "-c" "set")
:e
@{"SOME" "value"
"OTHER" "one"})
# => 0
# execute bash and prints environment variables
# which contains SOME=value and Other=one(os/execute
@("python" "-c" "print('Hello Janet'"))
:p)
# => 0
# execute python -c "print('Hello Janet') while
# searching path on the current path