Commands using xargs (769)

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Get the number of days in a given month and year

Email someone if a web page has been updated.
A cronjob command line to email someone when a webpages homepage is updated.

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

encode a text to url_encoded format
usefull for posts via wget

Split video files using avconv along keyframes

Make changes in .bashrc immediately available

Copy a file with progress and save hash to a different file

Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)


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