System Functions¶
In this chapter we are going to learn about the system functions
- System()
- SysGet()
- IsMSDOS()
- IsWindows()
- IsWindows64()
- IsUnix()
- IsMacOSX()
- IsLinux()
- IsFreeBSD()
- IsAndroid()
- Windowsnl()
- Get Command Line Arguments
- Get Active Source File Name
- CurrentDir()
- ExeFileName()
- ChDir()
- ExeFolder()
- Version()
- Shutdown()
System() Function¶
We can execute system commands using the system() function
Syntax:
System(cCommand)
Example:
System("myapp.exe") # Run myapp.exe
System("ls") # print list of files
SysGet() Function¶
We can get environment variables using the Get() function
Syntax:
SysGet(cVariable)
Example:
see sysget("path") # print system path information
IsMSDOS() Function¶
We can check if the operating system is MSDOS or not using the IsMSDOS() function
Syntax:
IsMSDOS() ---> Returns 1 if the operating system is MS-DOS, Returns 0 if it's not
IsWindows() Function¶
We can check if the operating system is Windows or not using the IsWindows() function
Syntax:
IsWindows() ---> Returns 1 if the operating system is Windows, Returns 0 if it's not
IsWindows64() Function¶
We can check if the operating system is Windows 64bit or not using the IsWindows64() function
Syntax:
IsWindows64() ---> Returns 1 if the operating system is Windows64, Returns 0 if it's not
IsUnix() Function¶
We can check if the operating system is Unix or not using the IsUnix() function
Syntax:
IsUnix() ---> Returns 1 if the operating system is Unix, Returns 0 if it's not
IsMacOSX() Function¶
We can check if the operating system is macOS or not using the IsMacOSX() function
Syntax:
IsMacOSX() ---> Returns 1 if the operating system is Mac OS X, Returns 0 if it's not
IsLinux() Function¶
We can check if the operating system is Linux or not using the IsLinux() function
Syntax:
IsLinux() ---> Returns 1 if the operating system is Linux, Returns 0 if it's not
IsFreeBSD() Function¶
We can check if the operating system is FreeBSD or not using the IsFreeBSD() function
Syntax:
IsFreeBSD() ---> Returns 1 if the operating system is FreeBSD, Returns 0 if it's not
IsAndroid() Function¶
We can check if the operating system is Android or not using the IsAndroid() function
Syntax:
IsAndroid() ---> Returns 1 if the operating system is Android, Returns 0 if it's not
Example¶
see "IsMSDOS() --> " + ismsdos() + nl
see "IsWindows() --> " + iswindows() + nl
see "IsWindows64() --> " + iswindows64() + nl
see "IsUnix() --> " + isunix() + nl
see "IsMacOSX() --> " + ismacosx() + nl
see "IsLinux() --> " + islinux() + nl
see "IsFreeBSD() --> " + isfreebsd() + nl
see "IsAndroid() --> " + isandroid() + nl
Output:
IsMSDOS() --> 0
IsWindows() --> 1
IsWindows64() --> 0
IsUnix() --> 0
IsMacOSX() --> 0
IsLinux() --> 0
IsFreeBSD() --> 0
IsAndroid() --> 0
Windowsnl() Function¶
We can get the windows new line string using the Windowsnl() function.
Syntax:
WindowsNL() ---> Returns a string contains CR+LF = CHAR(13) + CHAR(10)
Example:
cStr = read("input.txt")
if iswindows()
cStr = substr(cStr,windowsnl(),nl)
ok
aList = str2list(cStr)
# to do - list items processing using "for in"
cStr = list2str(aList)
if iswindows()
cStr = substr(cStr,nl,windowsnl())
ok
write("ouput.txt",cStr)
Get Command Line Arguments¶
We can get the command line arguments passed to the ring script using the sysargv variable.
The sysargv variable is a list contains the command line parameters.
Example
see copy("=",30) + nl
see "Command Line Parameters" + nl
see "Size : " + len(sysargv) + nl
see sysargv
see copy("=",30) + nl
if len(sysargv) < 4 return ok
nStart = sysargv[3]
nEnd = sysargv[4]
for x = nStart to nEnd
see x + nl
next
Output
b:\mahmoud\apps\ring>ring tests\syspara.ring 1 10
==============================
Command Line Parameters
Size : 4
ring
tests\syspara.ring
1
10
==============================
1
2
3
4
5
6
7
8
9
10
Get Active Source File Name¶
We can get the active source file name (*.ring) using the filename() function
Syntax:
filename() ---> String contains the active source file name.
Example:
see "Active Source File Name : " + filename() + nl
Output:
Active Source File Name : tests\filename.ring
Example:
if sysargv[2] = filename()
see "I'm the main program file!" + nl
# we can run tests here!
else
see "I'm a sub file in a program" + nl
ok
PrevFileName() Function¶
Using the PrevFileName() function we can get the previous active source file name.
The previous file would be the file of the caller function, Or the file of the function that we called before calling PrevFileName().
Syntax:
prevfilename() ---> String contains the previous source file name.
Example:
The next function in stdlib.ring uses the PrevFileName() to know if the file of the caller function is the main source file of the program or not.
Func IsMainSourceFile
if PrevFileName() = sysargv[2]
return true
ok
return false
CurrentDir() Function¶
Return the path of the current directory
Syntax:
CurrenDir() ---> String contains the path of the currect directory
ExeFileName() Function¶
Return the Ring executable file name
Syntax:
exefilename() ---> String contains the Ring executable file name
ExeFolder() Function¶
Return the Ring executable file path
Syntax:
exefolder() ---> String contains the Ring executable path
Version() Function¶
Return the Ring version
Syntax:
version() ---> String contains the Ring version
Output:
1.10