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Unix script to search within a .tar or .gz file

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# 1  
Old 11-11-2010
Question Unix script to search within a .tar or .gz file
HI,

I want to get few line from the file which is in .gz file. .gz file contains many txt files and I want to search a string in all these txt files and need to get the previous 3 line as output including current line(where search string present).
I tried the zgrep and got the line number, but when i use head or Tail command, Its giving some garbage values. I think we cannot use the Head or tail commands with the zip files containing multiple files.
Please suggest if there is any simple way?
# 2  
Old 11-11-2010
try these options if you have a GNU system.
Code:
   Context Line Control
       -A NUM, --after-context=NUM
              Print NUM  lines  of  trailing  context  after  matching  lines.
              Places   a  line  containing  a  group  separator  (--)  between
              contiguous groups of matches.  With the  -o  or  --only-matching
              option, this has no effect and a warning is given.

       -B NUM, --before-context=NUM
              Print  NUM  lines  of  leading  context  before  matching lines.
              Places  a  line  containing  a  group  separator  (--)   between
              contiguous  groups  of  matches.  With the -o or --only-matching
              option, this has no effect and a warning is given.

# 3  
Old 11-11-2010
No .. I dont have GNU system and i cannot extract files, as they are very huge and takes lot of space
# 4  
Old 11-11-2010
awk or sed should work. there are plenty of examples out there simliar to what your doing.
# 5  
Old 11-11-2010
Code:
gzcat compress.tar.gz | nawk '{ a=b; b=c; c=$0 } c~"your PATTERN" {print a"\n"b"\n"c; exit}'

# 6  
Old 11-11-2010
the above command didn't work , so i modifed it to awk from nawk

Now I am getting error "awk: Input line "XXX" cannot be longer than 3,000 bytes."
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