How to resolve the algorithm Check output device is a terminal step by step in the Lua programming language

Published on 12 May 2024 09:40 PM
#Lua

How to resolve the algorithm Check output device is a terminal step by step in the Lua programming language

Table of Contents

Problem Statement

Demonstrate how to check whether the output device is a terminal or not.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Check output device is a terminal step by step in the Lua programming language

Source code in the lua programming language

local function isTTY ( fd )
    fd = tonumber( fd ) or 1
    local ok, exit, signal = os.execute( string.format( "test -t %d", fd ) )
    return (ok and exit == "exit") and signal == 0 or false
end

print( "stdin", isTTY( 0 ) )
print( "stdout", isTTY( 1 ) )
print( "stderr", isTTY( 2 ) )


local unistd = require( "posix.unistd" )

local function isTTY ( fd )
    fd = tonumber( fd ) or 1
    local ok, err, errno = unistd.isatty( fd )
    return ok and true or false
end

print( "stdin", isTTY( 0 ) )
print( "stdout", isTTY( 1 ) )
print( "stderr", isTTY( 2 ) )

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