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NOS
	Login procedure
Developer	Control Data Corporation
Working state	Historic
Initial release	1975; 49 years ago
Latest release	NOS 2.8.7 L871 (Y2K fixed)
Marketing target	Mainframe computers
Platforms	CDC 6000 series and successors
License	Proprietary

NOS (Network Operating System) is a discontinued operating system with time-sharing capabilities, written by Control Data Corporation in 1975.^[2]

NOS ran on the 60-bit CDC 6000 series of mainframe computers and their successors. NOS replaced the earlier CDC Kronos operating system of the 1970s. NOS was intended to be the sole operating system for all CDC machines, a fact CDC promoted heavily. NOS was replaced with NOS/VE on the 64-bit Cyber-180 systems in the mid-1980s.

Version 1 of NOS continued to be updated until about 1981; NOS version 2 was released early 1982.

Time-sharing commands

ACCESS – selects the access subsystem
APL – selects APL programing language
ASCII – select fill 128-character ASCII
ATTACH – links to a permanent file
AUTO – automatically generate five-digit line numbers
BASIC – selects BASIC system
BATCH – selects the batch system
BEGIN – starts processing of CCL procedure (control language file)
BINARY – selects binary input mode
BRIEF – suppresses headers
BYE – log off the system
CALL – starts processing KCL procedure file (control language before CCL)
CATLIST – lists user's permanent files
CHANGE – changes parameters of a permanent file
CHARGE – set charge number and project number
CLEAR – releases all local files
CONVERT – converts character sets
(CR) – Carriage Return – requests terminal status if it is the first thing on a line
CSET – selects the terminal character-set mode
DAYFILE – lists a record of the user's activity
DEBUG – activates or terminates CYBER interactive Debug
DEFINE – create a direct-access permanent file
DIAL – sends a one-line message to another terminal
EDIT – Selects the text editor
ENQUIRE – Requests the current job status
EXECUTE – selects the Execute subsystem
FORTRAN – selects the FORTRAN subsystem (FORTRAN 5)
FTNTS – Selects the FORTRAN Extended Version 4 compiler (CDC's enhanced version of FORTRAN 4)
FULL – Selects full-duplex mode
GET – gets a copy of a permanent file
GOODBYE – same as BYE
HALF – clears full-duplex mode
HELLO – logs out and starts login
HELP – gets descriptions of NOS commands
LENGTH – requests the length of a file
LIB – get a copy of a permanent file
LIMITS – lists the user's limits
LIST – lists the contents of a file
LNH – same as LIST except no headers
LOGIN – same as HELLO
LOGOUT – same as BYE
MONITOR – connects to a terminal
NEW – creates a new primary file
NORMAL – clears modes set by ASCII, AUTO, BRIEF, NOSORT, CSET, PARITY, and TAPE
NOSORT – prevents the system from sorting the primary file on the subsequent command
NULL – selects the null subsystem.
OLD – gets a copy of a permanent file
P – proceed
PACK – compress a file with several logical records into one logical record
PACKNAM – direct subsequent file requests to an auxiliary device
PARITY – set terminal parity
PASSWOR – change user password
PERMIT – grants another user permission to access a file
PRIMARY – makes temporary file the new primary file
PURGE – removes permanent files
RECOVER – allows user to resume after terminal was disconnected
RENAME – changes file name
REPLACE – replace the contents of a permanent file with a temporary file
RESEQ – resequence or add line numbers to the primary file
SAVE – save a file permanently
SETASL – sets SRU account block limit (SRU = System Resource Unit, on hard drive)
SETTL – set CPU time limit
SORT – sort the primary file
STATUS – same as ENQUIRE
STOP – terminates currently running programs
SUBMIT – submit a batch job deck image
TRAN – select NOS transaction subsystem
USER – get terminal number
X – process a time-sharing command as a batch command
XEDIT – select XEDIT editor