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Many computer systems measure time and date using Unix time, an international standard for digital timekeeping.Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch.
date: Prints or sets the system date and time dirname: Strips non-directory suffix from file name du: Shows disk usage on file systems echo: Displays a specified line of text env: Displays and modifies environment variables: expr: Evaluates expressions factor: Factors numbers: false: Does nothing, but exits unsuccessfully groups
The last modification date stamp (and with DELWATCH 2.0+ also the file deletion date stamp, and since DOS 7.0+ optionally also the last access date stamp and creation date stamp), are stored in the directory entry with the year represented as an unsigned seven bit number (0–127), relative to 1980, and thereby unable to indicate any dates in ...
In all versions above 10.2, the text is superimposed on a standby symbol and is not full screen. Debugging information is saved in NVRAM and written to a log file on reboot. In 10.7 there is a feature to automatically restart after a kernel panic.
Process management Optional (UU) Remote command execution Version 7 AT&T UNIX val: SCCS Optional (XSI) Validate SCCS files System III vi: Text processing Optional (UP) Screen-oriented (visual) display editor 1BSD wait: Process management Mandatory Await process completion Version 4 AT&T UNIX wc: Text processing Mandatory
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Download QR code; Print/export ... A simplified crash screen was introduced in Linux 6.10, similar to the Blue Screen of Death on Windows. [8] See also