grep

| grep regex

netstat | grep TIME_WAIT | wc -l
netstat | grep ESTABLISHED | wc -l

grep alias

find / | grep "*."
egrep = grep -E     # 'egrep' grep -E
fgrep = grep -F     # 'fgrep' grep -F
grep  = grep -G     # 'grep' grep -G

line

• -r - recursive

• -n - which line

grep -nr 'yourString*' .

grep -A 2 -B 3 "some_keyword" *  # front 3 lines, end 2 lines

grep count

grep -c "some_keyword" some_file

which file

• -H - which file

grep -H "some_keyword" *

How can I use grep to find a word inside a folder?

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https://stackoverflow.com/questions/4121803/how-can-i-use-grep-to-find-a-word-inside-a-folder

command line grep * does not work but grep *. works

From your output it is apparent that you want to find all files that belong to "staff" group and created at hour 22 ( or 10 pm in 12 hour format ). We'll address that below, but lets first figure out what your grep commands do and why they're not the right tool for what you want.

https://askubuntu.com/questions/872716/command-line-grep-does-not-work-but-grep-works

Start from the Beginning : 네이버 블로그

https://blog.naver.com/itperson/220839763320