install android sdk using command line linux

It works fine for me. Try it without the --no-ui flag and see if that works. If not, what is the error message you get?

Edit:

You probably have your PATH configured incorrectly. You need to execute the "current folder executable" as follows:

$ ./android update sdk --no-ui

If you are using Android SDK Tools Rev 19 you should get

$ android --help update sdk       Usage:       android [global options] update sdk [action options]       Global options:  -h --help    : Help on a specific command.  -v --verbose : Verbose mode, shows errors, warnings and all messages.  -s --silent  : Silent mode, shows errors only.                     Action "update sdk":  Updates the SDK by suggesting new platforms to install if available.Options:     --proxy-port: HTTP/HTTPS proxy port (overrides settings if defined)     --proxy-host: HTTP/HTTPS proxy host (overrides settings if defined)  -s --no-https  : Uses HTTP instead of HTTPS (the default) for downloads.  -a --all       : Includes all packages (such as obsolete and non-dependent                   ones.)  -f --force     : Forces replacement of a package or its parts, even if                   something has been modified.  -u --no-ui     : Updates from command-line (does not display the GUI)  -p --obsolete  : Deprecated. Please use --all instead.  -t --filter    : A filter that limits the update to the specified types of                   packages in the form of a comma-separated list of                   [platform, system-image, tool, platform-tool, doc, sample,                   source]. This also accepts the identifiers returned by                   'list sdk --extended'.  -n --dry-mode  : Simulates the update but does not download or install                   anything.

and -u or --no-ui is one of the options.

Just to add. When you use the proxy options do not supply the http:// part. The android executable will not complain, and will report everything downloaded ok. I was on a completely new install and was sure nothing was downloaded yet.