Menu
Is it possible to read the following from the local variable in Lua?
local t = os.execute("echo 'test'") print(t) I just want to achieve this: whenever os.execute returns any value, I would like to use it in Lua - for example echo 'test' will output test in the bash command line - is that possible to get the returned value (test in this case) to the Lua local variable?
881
The Lua os. execute() function can be used to run an external program from SIMION. The Lua io. popen() function is similar but captures any data written to standard output as a string (or writes a string to standard input). API details on these functions are in the Lua Reference Manual.
If you want to affect the lua process's environment (which would then, in turn, affect the environment's of processes run by lua) then you need a binding to the setenv system function (which lua itself doesn't provide as it doesn't pass the clean C test that lua uses for things it includes).
If you need to execute a shell command with Python, there are two ways. You can either use the subprocess module or the RunShellCommand() function. The first option is easier to run one line of code and then exit, but it isn't as flexible when using arguments or producing text output.
You can use io.popen() instead. This returns a file handle you can use to read the output of the command. Something like the following may work:
local handle = io.popen(command) local result = handle:read("*a") handle:close() Note that this will include the trailing newline (if any) that the command emits.
140
function GetFiles(mask) local files = {} local tmpfile = '/tmp/stmp.txt' os.execute('ls -1 '..mask..' > '..tmpfile) local f = io.open(tmpfile) if not f then return files end local k = 1 for line in f:lines() do files[k] = line k = k + 1 end f:close() return files end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
