/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

11 votes332 views2 answers
Install slack on linux
Shell/Bash
-1 vote345 views2 answers
Gitlab Reconfigure
Shell/Bash
0 vote344 views1 answer
Run ssh and immediately execute command
Shell/Bash
0 vote382 views1 answer
Mac find exclude a directory
Shell/Bash
0 vote349 views1 answer
How to find my apache server ip address
Shell/Bash
7 votes361 views2 answers
Remove all files with extension bash
Shell/Bash
0 vote345 views1 answer
Git ignore whitespace
Shell/Bash
0 vote328 views1 answer
Minikube start with docker driver
Shell/Bash
1 vote360 views2 answers
Delete commit from github
Shell/Bash
0 vote304 views0 answer
Shell/Bash