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2. 'who' command tells all user lists. 'whoami' command tells which user is logged in.
3. 'date' command gives the current date. '--' prefix for options. '%' prefix for formatting the output. eg, date +%d : 22; date +%d-%m : 22-01;
4. only superuser can change the date.
5. ASCII - A=65 , EBCDIC: IBM - A=C1 , UNICODE
6. UNIX is a scripting as well as an interpreter language.
7. In UNIX, everything is file.
8. Sir is tryin to make sense. Bash/command line/powershell are something sir will tell when the time is appropriate. d-directories, r-read, w-write, x-execute. / in unix, and in windows.
9. File is of two types :- text file(Sir ne kuch ni btaya) or binary file(compact, faster access, more reliable).
10. Terminal Commands-
a. man - manual eg, man man gives manual page of man command. Press q to exit.
b. tput clear/clear - clears the terminal
c. ps - shows the processes running in the system.
d. ls- lists all the files/directories.
e. cal - calender, cal 01 2001 - shows calender of jan 2001
f. bc - calculator, Esc/Ctrl + D to exit
g. passwd - change password
h. pwd - present working directory
i. wc - word count eg, ls | wc : gives word count of output of ls command.
j. echo
k. printf "Hello World"n
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