/Shell/Bash/How to grep lines before a pattern

How to grep lines before a pattern

cat abc.txt | grep -B 3 "your_pattern"  #  will grep 3 lines bofore your pattern..
cat abc.txt | grep -A 3 "your_pattern"  # will grep 3 lines after your pattern..
tac abc.txt | grep -A 3 "your_pattern" # will grep 3 lines bofore your pattern..
cat abc.txt | grep -B 3 -A 3 "your_pattern"  
tac is upside down of the file , cat - tac



$ cat testing
aaa
11
21
31
41
51
aaa
12
22
32
42
51
aaa
13
23
33
33
43
53
aaa

$ cat testing | grep -A 2 aaa
aaa
11
21
--
aaa
12
22
--
aaa
13
23
--
aaa

tac testing | grep -A 2 aaa
aaa
53
43
--
aaa
82
72
--
aaa
61
51
--
aaa

Similar codes

0 vote150 views1 answer
Delete lines text file linux
Shell/Bash
19 votes108 views1 answer
Git remove folder remotely
Shell/Bash
0 vote145 views1 answer
Git roll back to a point
Shell/Bash
7 votes138 views2 answers
Install pip arch linux
Shell/Bash
34 votes145 views10 answers
Jquery
Shell/Bash
0 vote150 views1 answer
Open file in note from command line linux
Shell/Bash
3 votes178 views1 answer
Installing ncurses library
Shell/Bash
1 vote137 views1 answer
WSL connect docker daemon to docker for windows
Shell/Bash
12 votes169 views1 answer
Flutter doctor android license exception in thread main
Shell/Bash
-1 vote148 views4 answers
Youtube-dl ubuntu
Shell/Bash