Shell_Script_OS

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man - This Command use For Manual
-> man man
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date - Date Command use For get Date.
-> man date (get manual date command)
	%d	Day
	%m	Month
	%y	Year
	%b	First 3 Character Of Month
	%a	First 3 Character Of Day
	%A	Full Name Of Day

Example - Aug 21 17 (Month Date Year)
Commnad - date "+%b %d %y"
Command - date "+R" (get time)
Commnad - date "+r" (get time with AM,PM)
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cal - Calender Command use for get current Calendar.
->man cal (get manual cal command)
	-h	Turns off highlighting of today.

Example - Print August 2017 Calendar
Command - cal 08 12
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ls - list directory
->man ls (get manual ls command)
	-l	show attribute (read,write,excute).
	-lh	human readable with file size.
	-a	all files view.
Example - list all directory
Command - ls -a
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cut - remove sections from each line of files
->cut -d '|' -f 2 TextFileName.txt | cat > TextFileName2.txt
	-d -> delimiter (sign , | : etc.)
	-f -> field number
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Table Example
1|Virajsinh|MscIT|USA
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chmod - chmod use for change file mode.(use for file permission)
	u - user
	g - group
	o - other
	r - read (value : 2)
	w - write (value : 4)
	x - execute (value : 1)
	'+' '-' use Plus minus for permission
Example - Set All Permission
Example - chmod 7 filename (2+4+1=7 all permission)
Example - chmod u+r filename (user read file only)
Example - chmod chmod u+r,g-w,o-w (use read, group not write, other not write)
link - http://www.sanfoundry.com/10-practical-chmod-command-usage-examples-in-linux/
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grep - grep command to highlight word in text file
Commnad - grep "Word" FileName.text
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tee - tee commnad use for another file make
Example - cat OneFile.text | tee SecondFile.text