There is no answer to this question.
Under UNIX and Linux, commands are either shell native or external programs found on the path (which usually includes /bin /sbin /usr/bin and ~/bin)
Most UNIX and distros allow the admin to choose a shell program of choice and modify the contents of other directories and many admins allow individual users to change their personal shell and add additional executable files adding more commands.
That being the case, theoretically any command can be valid under almost any UNIX or Linux. YMMV.
Commands you use in a Unix based computer OS to achieve certain things. Similar to MS/DOS commands in Windows. Mostly used in computers running the Linux OS. unix command
Linux and Unix and their variants have several different ways of locating files. each of the below commands can be used to locate files.findlocatewheriswhich
Because Linux evolved from UNIX, but Windows evolved from DOS.
"gettimeofday" is a command used in Linux and Unix, thus not capitalized. If one wishes to find information on it, the person should look for a manual or a list of Linux/Unix commands with definitions.
There is none. For starters, you have it backwards, DOS actually copied most of its commands from Unix (The rest came from CP/M.), which Linux is inspired by. Commands like "cd" and "dir" were Unix commands long before DOS even existed.
No. Linux is a free, open-source version of UNIX. Many of DOS's commands were based on UNIX commands, but the underlying operating system is much more powerful than DOS.
Because Linux is actually more popular in most fields these days than certified Unix.
Man (or manual) pages
The very first one, period. The first shell for Unix didn't originally have a name but has since been referred to as the Thompson shell. The first shell ported to Linux was bash.
The Subsystem for UNIX-based Applications (SUA)For a UNIX or Linux client, SUA creates a multiuser environment complete with commands, case-sensitive abilities, programming tools, shells (runtime environments), and scripts. With SUA installed, even UNIX/Linux programs can be ported over to Windows Server 2008.
No, but Linux is based on Unix since Linux is a Unix clone.
The lp and lpr commands are the traditional commands used to print jobs on UNIX.