Linux In Abundance

hwclock - query and set the hardware clock (RTC) hwclock is a tool for accessing the Hardware Clock. You can display the current time, set the Hardware Clock to a specified time, set the Hardware Clock to the System Time, and set the System Time from the Hardware Clock. You can also run hwclock periodically to insert or remove time from the Hardware Clock to compensate for systematic drift (where the clock con- sistently gains or loses time at a certain rate if left to run). hwclock -r or hwclock --show hwclock -w or hwclock --systohc hwclock -s or hwclock --hctosys hwclock -a or hwclock --adjust hwclock -v or hwclock --version hwclock --set --date=newdate hwclock --getepoch hwclock --setepoch --epoch=year other options: [-u|--utc] --localtime --noadjfile --directisa --test [-D|--debug] and arcane options for DEC ...

1.5.2 Hard and Soft Links A filename included in a directory is called a file hard link , or more simply a link . The same file may have several links included in the same directory or in different ones, thus several filenames. The Unix command: $ ln f1 f2,  is used to create a new hard link that has the pathname f2 for a file identified by the pathname  f1. Hard links have two limitations: • Users are not allowed to create hard links for directories. This might transform the directory tree into a graph with cycles, thus making it impossible to locate a file according to its name. • Links can be created only among files included in the same filesystem. This is a serious limitation since modern Unix systems may include several filesystems located on different disks and/or partitions, and users may be unaware of the physical divisions between them. In order to overcome these limitations, soft links (also called symbolic links ) have been int...