#Linux #tips
如何在 shell 脚本中判断软件是否存在
if ! command -v <the_command> &> /dev/null
then
echo "<the_command> could not be found."
exit 1
fi
if ! command -v <the_command> &> /dev/null
then
echo "<the_command> could not be found."
exit 1
fi
When enabling the VPN, changing the location on the VPN, or disabling it does not work as expected, continue with the rest of the fixes. The Windows Firewall protects your computer from viruses by blocking programs and apps from untrusted sources. In some cases, it can also affect the functioning of everyday apps like Telegram. Therefore, it is imperative to ensure that the Firewall doesn't block Telegram. You can do this by whitelisting Telegram in your Firewall settings. To do that, follow these steps: Open the Windows Control Panel. Go to Windows Defender Firewall. Click on Allow an app or feature through Windows Defender Firewall. Windows Defender Firewall Settings in Windows 10 Control Panel Check the Public and Private boxes for the Telegram app in the list. You may need to manually add Telegram if it isn't there already. To do that, click on Change settings in the Allowed apps window. Click on Allow another app... and copy the path to the folder where Telegram is installed, or browse to it. Then click Add. Don't forget to check the Public and Private boxes after adding the app to the list of allowed apps.
With Telegram, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 200,000 people or channels for broadcasting to unlimited audiences. You can write to your phone contacts and find people by their usernames. As a result, Telegram is like SMS and email combined — and can take care of all your personal or business messaging needs. In addition to this, we support end-to-end encrypted voice calls.
Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.
Telegram is for everyone who wants fast and reliable messaging and calls. Business users and small teams may like the large groups, usernames, desktop apps and powerful file sharing options. You can appoint admins with advanced tools to help these communities prosper in peace. Public groups can be joined by anyone and are powerful platforms for discussions and collecting feedback.In case you're more into pictures, Telegram has animated gif search, a state of the art photo editor, and an open sticker platform (find some cool stickers here or here). What's more, there is no need to worry about disk space on your device. With Telegram's cloud support and cache management options, Telegram can take up nearly zero space on your phone.
Unlike WhatsApp, Telegram is a cloud-based messenger with seamless sync. As a result, you can access your messages from several devices at once, including tablets and computers, and share an unlimited number of photos, videos and files (doc, zip, mp3, etc.) of up to 2 GB each. And if you don't want to store all that data on your device, you can always keep it in the cloud.Thanks to our multi-data center infrastructure and encryption, Telegram is faster and way more secure. On top of that, Telegram is free and will stay free — no ads, no subscription fees, forever.
Yes! Voice calls are currently available to users around the world.
Many modern travelers appear to struggle with managing various aspects of their finances simultaneously while abroad, such as banking, budgeting, investing, trading, and saving. It is important to have apps installed on the device that will help you carry out these necessary tasks.
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