/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

-1 vote284 views2 answers
Docker-compose install in centos 7
Shell/Bash
0 vote286 views1 answer
Mpeg-4 aac decoder h.264 decoder for ubuntu download
Shell/Bash
1 vote288 views1 answer
Snap install clion
Shell/Bash
10 votes299 views2 answers
Angular cli interface generate
Shell/Bash
0 vote268 views1 answer
Could not load reporter by name: mochawesome
Shell/Bash
0 vote313 views1 answer
Pip install audioread
Shell/Bash
8 votes304 views1 answer
Does undo commit delete the code or move it to uncommitted
Shell/Bash
0 vote302 views1 answer
Gitlab ee version check
Shell/Bash
105 votes320 views6 answers
Install python mac
Shell/Bash
0 vote323 views1 answer
How to run a specific knex seed file
Shell/Bash