The command 'date', among other things, allows printing a date specified relatively to the present or to a specific date, which allows very convenient calculations on dates.

A small example of a trivial shell function that naively converts and prints a number of seconds to hours, minutes and seconds.

A presentation of a simple solution allowing for encryption of the remote connections initiated by rsync using SSH while restricting its accesses to a directory, potentially in read-only mode.

How the array manipulation functionalities specific to bash make it possible to more easily retrieve the positional parameters of a script or function.

How to do a simple loop over the parameters of a shell script, from the first to the last one and from the last to the first one.

Processing a variable number of fields in text lines using the awk command and its language.