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Top Forums Shell Programming and Scripting Grep pattern only and surrounding lines Post 302978032 by jacobs.smith on Monday 25th of July 2016 01:12:20 PM
Old 07-25-2016
Grep pattern only and surrounding lines

Hello,

I am trying to grep search a pattern and a line before it.

Code:
cat input
>record1
hello1hello2hellonhello3
>record2
helloohello1hello2hello3

When I use, grep with -o option and either of -A/B/C options, I still can't see lines before or after the pattern. But the exact pattern is being printed fine though. Any pointers are appreciated.

Expected output is

Code:
cat input | grep -o "hello[a-z]hello"
>record1
hellonhello
>record2
helloohello

But current output is

Code:
cat input | grep -o -B 1 "hello[a-z]hello"
hellonhello
helloohello


Thanks in advance.
 

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set_color(1)                                                           fish                                                           set_color(1)

NAME
set_color - set_color - set the terminal color set_color - set the terminal color Synopsis set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR] Description Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple, cyan, white and normal. o -b, --background Set the background color o -c, --print-colors Prints a list of all valid color names o -h, --help Display help message and exit o -o, --bold Set bold or extra bright mode o -u, --underline Set underlined mode o -v, --version Display version and exit Calling set_color normal will set the terminal color to whatever is the default color of the terminal. Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey font color, while set_color --bold white will result in a white font color. Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator. set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of ncurses and recompile fish against it in order to fix this issue. Version 1.23.1 Sun Jan 8 2012 set_color(1)
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