grep , egrep , fgrep howto

[golfreeze]

==show line number if found exact word "day" not "today" in file test.txt
grep -n -w "day" test.txt

[golfreeze]

==found word="today" or "future" in file test.txt then show number also
grep -nw -i -e "today" -e "future" test.txt

[golfreeze]

##grep without word "tomorrow" on file test.txt
grep -v "tomorrow" test.txt

[golfreeze]

===fgrep = fix grep use with need finding word contain $ {} ? + . | ( )
fgrep "day$" test.txt