How to remove lines before and after with awk / sed ?

Shell Programming and Scripting
1

Hi guys,

I need to remove the pattern (ID=180), one line before and four lines after.

Thanks.

2

Could you please be more descriptive on the pattern of your input file and what exactly your requirement is??

3

The file has multiple entries beginning with id, name, url, created, uniqueid visited.
I want to remove some entries (they are dead links). However I can't manage to delete the line above the Id field (#url).

4

grep -v "ID=180" <filename> > abc.txt # will print all lines that does not match the string "ID=180" and will direct them to abc.txt

5

You can use grep if your grep version supports the -A and -B option, otherwise:

awk '/ID=180/{c=4;next}
c--<0 && p{print p}
{p=$0}
END{print p}
' file
1 Like
6

That works fine. Thank you, Franklin52.