/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 vote314 views1 answer
Invokemethodonnull powershell try catch
Shell/Bash
3 votes316 views2 answers
Pip install tensorflow no matching distribution found for tensorflow
Shell/Bash
0 vote283 views1 answer
Libbre office ubuntu
Shell/Bash
2 votes280 views3 answers
Error Failed to install the app. Make sure you have the Android development environment set up
Shell/Bash
8 votes298 views3 answers
Search tag git
Shell/Bash
-2 votes302 views1 answer
Terminal switch to root
Shell/Bash
22 votes298 views4 answers
Cmd listening ports
Shell/Bash
0 vote319 views1 answer
Most git libya
Shell/Bash
69 votes315 views1 answer
Git override remote origin
Shell/Bash
2 votes302 views2 answers
How to update powershell version
Shell/Bash