Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Post a file to a server using the Curl command
Answer:
You can simulate a HTTP form post, with a file being uploaded to a remote server using the curl command.
curl -F 'photo=@/upload/image.jpg' http://example.com/upload.phpAssume the name of the form element of your upload is called "photo"
Debug and verify Postfix configurations
Answer:
A simple way to debug and verify your Postfix configurations is the use the sendmail command with the -bv flag.
Example:
# sendmail -bv [email protected]
No email will be sent using the above command, it just report after verifying each recipient address. This is very useful for testing the Postfix configurations.
Create a transparent image using ImageMagick
Answer:
You can use the following command to create an empty png file, using the ImageMagick.
# convert -size 100x100 xc:none empty.png
an empty png of size 100x100 will be created.
Install Google Chrome in Ubuntu
Answer:
To install Google Chrome in Ubuntu, the simplest way is to us PPA
E.g.
1. Add the key and URL
# wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
# sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
2. Install it
# sudo apt-get update
# sudo apt-get install google-chrome-stableDone.
Download a complete directory on FTP server with wget
Answer:
You can try the command below in order to download all the files/sub-directories under the directory "dir"
# wget -r ftp://user:[email protected]/dir/*
