Hi I am writing a node js app where I need to pass the path to some file via command line. I need to do this for configuration purposes. I understand that I can put all config details in a json file and then load it inside the app. But this is a specific requirement.
Here is my code
app.js
----
-----
console.log(process.argv);
---
--
// Start server
Now when I run this file in node as:
node app.js hii
Output
'hii'
But if I do
node app.js '/samplePath'
I get this output in DOS:
'\'/samplePath\''
I get this output in Git Bash:
'C:/Program Files/Git/samplePath'
How will I get just '/samplePath' as output? What am I doing wrong? Any help would be appreciated.
In order to get the last item, try
process.argv[2].split(/\//).pop();
You will have to parse the command line options your self. However you can look into this node module that will make this easy for you.
npm install commander
Here is an example from their Github page
var program = require('commander');
program
.version('0.0.1')
.option('-p, --peppers', 'Add peppers')
.option('-P, --pineapple', 'Add pineapple')
.option('-b, --bbq', 'Add bbq sauce')
.option('-c, --cheese [type]', 'Add the specified type of cheese [marble]', 'marble')
.parse(process.argv);
Related
I have an application (IP2SI2IP.exe ) and I wrote this command in JS to run it :
<script type="text/javascript">
function run(){
wshShell=new ActiveXObject("Wscript.shell"
);
wshShell.Run("C:/Windows/System32/cmd.exe",1,false)
wshShell.Run("IP2SI2IP /S /N xxx.SES",1,false)
}
</script>
This app converts the specific file with SES extension (for example : xxx.SES ) IP unit to SI unit. Anytime when I have a new input file (for example yyy.SES), I have to re-type it manually in front of the IP2SI2IP /S /N command the run it again.
I'm looking for another command that it can first: find the file with SES extension from the related folder then puts this SES file in front of the "IP2SI2IP /S /N" command and run it by itself.
Thanks!
I have a Node.js program where I need to, on a button click, run 2 commands in the Windows command line. For example, the process I'm trying to automate by the button click would be doable manually by going to cmd and entering the following commands:
pushd \\myserver.com\folder1\folder2 //Connect to remote server folder structure
mkdir NewFolder //Create new folder in the remote folder
I've found many resources pointing that I should use 'child_process', but I'm absolutely lost when it comes to shell scripting and am having a really hard time figuring out how to do this. Here's the code I have so far:
var cp = require('child_process');
cp.exec('pushd \\\\myserver.com\\folder1\\folder2\\', { shell: '/bin/bash' }, function(err, stdout, stderr){
if(err){
console.log(err);
}
});
But this above code just returns this error (which oddly removes the '\'s from the given dir):
{ Error: Command failed: pushd \\myserver.com\folder1\folder2\
/bin/bash: line 1: pushd: \myserver.comfolder1folder2: No such file or directory
at ChildProcess.exithandler (child_process.js:281:12)
killed: false,
code: 1,
signal: null,
cmd: 'pushd \\\\myserver.com\\folder1\\folder2\\' }
/bin/bash: line 1: pushd: \myserver.comfolder1folder2: No such file or directory
I'm really lost here and would appreciate any help. Any alternative you have to child_process may also be very helpful. Thank you!
Usually all the escape sequences used for string uses '\\' for a single backslash. It is understandable you used it here for the directory path for windows.
In JS particularly '\\' doesn't exactly work like that
'abc\
def' == 'abcdef' // true
'\a' == 'a' // true
When a '\' is not followed by a character with any special meaning, it is considered to be a LineContinuation instead.
As you can see from your error output using '\\\\myserver.com' considered '\myserver.com'. Plain workaround is to use '\\\\' for single '\' or use '/' for path separation which I'm not pretty sure if shell will execute it.
This is one of the blogs explains about it in details Link.
The shell is incorrect here:
{ shell: '/bin/bash' }
It should be:
{ shell: 'CMD.EXE' }
Because in the beginning of your post, you tell that you run 2 commands in the Windows command line, which indicates you are not using Bash, which is (usually) not installed on Windows.
I am running util.checkForServerUpgrade() function in JS mode in MySQL Shell utility. I need output of mentioned function in file instead of command-line.
Here is the exact syntax which I am using:
util.checkForServerUpgrade('root#localhost:3306', {"password":"abc", "targetVersion":"8.0.11", "outputFormat":"JSON", "configPath":"C:\ProgramData\MySQL\MySQL Server 5.7\my.ini"})
I have tried appending > output.json and many more but not working for me.
Execute the util.checkForServerUpgrade call from the command line when mysqlsh ist started:
mysqlsh root:****#localhost:3306 -e "util.checkForServerUpgrade('root#localhost:3306', {\"password\":\"abc\", \"targetVersion\":\"8.0.11\", \"outputFormat\":\"JSON\", \"configPath\":\"C:\ProgramData\MySQL\MySQL Server 5.7\my.ini\"})" > err.log
I'm calling an Applescript scpt file and when I opened the AppleScript editor it had an option to use JavaScript.
I would like to convert my AppleScript to JavaScript but can't find any documentation on it (announcements and such and redirects on apple).
Here is my AppleScript:
#!/usr/bin/osascript
on run argv
set output to "{\"1st Parameter\":\"" & first item of argv & "\"}"
return output
end run
More context:
I'm trying to loop through a directory and export from Excel. I only need to know about how to run JavaScript in a SCPT file but this is the background.
#!/usr/bin/osascript
on run argv
#goal is to export multiple files to csv
#the plan is to
#pass in folder and loop through files or
#pass in array of files (paths as a comma separated string)
#pass in single file and call script multiple times
set processReportsScript to "excel -e '" & first item of argv & "' '" -o '" & second item of argv & "'.csv'"
do shell script processReportsScript
end run
UPDATE:
While in Script Editor I'm able to run this JavaScript:
function run(args) {
var x = false;
var y = Application("Mail");
var running = y.running();
var id = y.id();
debugger;
if (x) {
console.log("Why isn't this being called?")
}
return "hello";
}
Based in part on this guide.
However when I save the JavaScript into the SCPT file and call it from an external application it gives the following error:
script error: Expected end of line, etc. but found “(”. (-2741)
It does not give any errors when using AppleScript.
FYI the external application is passing the script to osascript.
UPDATE 2:
I changed the extension from scpt to js and now it's running. I read that it's possible to pass in the language type using -l but when I do I get numerous variations of the error:
no such component " 'JavaScript'"
no such component " JavaScript"
As long as it works by changing the extension I think this works.
Both AppleScript and JavaScript for Automation (JXA) use the same file extension: ".scpt". When you are in the Script Editor, there is a language popup where you can select either:
The is no tool for auto-conversion from AppleScript to JXA.
For more info about JXA, see
JXA Resources
My requirement is I need to check whether Chrome browser is insatlled on the client machine or not using Javascript. I have searched on the net not able to find the way out.
Please help in getting this done.
You can't do that with JavaScript, and even if you could, you shouldn't.
JavaScript on the client doesn't have access to the user's system, for very good reasons. (Think, servers with bad intentions.)
You can check if the browser is Chrome with the next code
if(!window.chrome){
//Chrome code
}else{
// Chrome block
}
You can't. Not with JavaScript. However, you can check whether the browser that is currently being used to view your webpage is Google Chrome or not.
<script type="text/javascript">
if(window.chrome){
document.write("Browser is Chrome");
}
else{
document.write("Please download Chrome");
}
</script>
You can't get that kind of information directly from javascript.
What you can do is use that PowerShell command in a script and save the result in a file that you'll read later using javascript.
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation, Publisher, InstallDate | Format-Table -AutoSize
This will get you all the installed programs on the machine from the HKEY_LOCAL_MACHINE registry folder.
The exact path to the folder from wich the informations are retrieved is : HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\
The given command will display you the application name followed by it's version, it's install location, publisher name and installation date in a PowerShell terminal.
If you want to output that list in a file simply add >FileName.txt after the command before pressing enter.
Note that by default the file will be created in the C:\Users\YourUserName\ folder so if you want the file to be created in a specific location you'll have to use the CD command to get to that specific location before executing the Get-Item-Property command.
This will get you done for the get installed programs on a machine part.
Now we can get into the check if app x is installed on the machine part.
First load the previously generated file in your js application you will use it's content to determine if an application is installed on the computer.
The faster way to get if 'chrome' is installed will be to load the file as a string and then do that basic stuff :
if (string.includes('chrome') == true) {
// chrome is installed on the machine
// you can do some more stuff
// like extracting it's path from the file content
} else {
console.log('error: chrome is not installed on this computer');
}
Needless to say that this will only work if used on the same computer from which you want to check the installed applications.
Edit: If you want a more practical file to use in javascript you can replace
Format-Table -AutoSize >FileName.txt
with :
Export-Csv -path .\FileName.txt -NoTypeInformation
this way you can split your file lines using the string.split(',') method and don't have to do some extra stuff to deal with the spaces between data.
Edit 2:
Here's a full working implementation that will let you retrieve informations from a PowerShell script directly from your javascript using NodeJs.
get_programs.ps1 (PowerShell script file) :
chcp 65001 # sets the encoding for displaying chars correctly
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850 # restores the default encoding set this will avoid police changes due to the terminal modifications
Notice the change at the end of the command which is now:
| ConvertTo-Csv -NoTypeInformation
this allows to log data in the PowerShell terminal in the csv format which will simplify it's parsing as a string.
If you don't want to use another file to hold those few PowerShell
commands you can use this
child = spawn("powershell.exe",[`chcp 65001
Get-ItemProperty HKLM:\\Software\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850`]);
as a replacement for
child = spawn("powershell.exe",["./get_programs.ps1"]);
If you choose to do this don't forget to escape the \ chars else it will not work.
app.js :
var spawn = require("child_process").spawn,child;
child = spawn("powershell.exe",["./get_programs.ps1"]); // here we start our PowerShell script "./" means that it's in the same directory as the .js file
let chromeDetails;
child.stdout.on("data", (data) => { // data event
// here we receive each outputed line in the PowerShell terminal as an Uint8Array
if (data.includes('Chrome')) { // check for the 'Chrome' string in data
chromeDetails = data.toString(); // adds data converted as string
}
});
child.stderr.on("data", (data) => { // logs errors
console.log(`Powershell Errors: ${data}`);
});
child.on("exit", () => { // exit event
console.log("Powershell Script finished");
if (chromeDetails != undefined) {
console.log(`> chrome has been detected on this computer
available informations (appName, version, installPath):
${chromeDetails}`);
} else
console.log('> chrome has not been detected on this computer');
});
child.stdin.end(); // we end the child
Expected output :
Powershell Script finished
> chrome has been detected on this computer
available informations (appName, version, installPath):
"Google Chrome","103.0.5060.114","C:\Program Files\Google\Chrome\Application"
If you are not on Windows you may want to take a look at Spawning .bat and .cmd files on Windows from the NodeJs documentation to get hints on how to adapt the above app.js code to work on your system.