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Grepping before and after lines for required string

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Operating Systems AIX Grepping before and after lines for required string
# 1  
Old 12-14-2012
[SOLVED] Grepping before and after lines for required string
Hi All,

I am new to AIX unix . i need to grep for a pattern and if pattern is found then i need 3 before the pattern line found and 3 lines after the pattern found.
# 2  
Old 12-14-2012
grep greps lines, it can't do logic or other recall, it's not really a programming language. The awk language can do logic and recall.

Code:
$ cat <<"EOF" > context.awk
# Recall N lines ago up to 9 lines
function last(N)
{
        if(N>L) return("");
        return(LINE[(L-N)%10]);
}

{ LINE[(++L)%10]=$0 } # Remember line for later

$0 ~ PATTERN { for(N=3; N>=1; N--) print last(N);
        print;
        for(N=0; N<3; N++) { getline ; print }
}
EOF

$ nawk -f context.awk PATTERN="myregex" filename1 filename2 ...

# 3  
Old 12-14-2012
Hi I have to search this in *.gz file , will it be work?

---------- Post updated at 03:16 PM ---------- Previous update was at 03:14 PM ----------

Quote:
Originally Posted by Corona688
grep greps lines, it can't do logic or other recall, it's not really a programming language. The awk language can do logic and recall.

Code:
$ cat <<"EOF" > context.awk
# Recall N lines ago up to 9 lines
function last(N)
{
        if(N>L) return("");
        return(LINE[(L-N)%10]);
}
 
{ LINE[(++L)%10]=$0 } # Remember line for later
 
$0 ~ PATTERN { for(N=3; N>=1; N--) print last(N);
        print;
        for(N=0; N<3; N++) { getline ; print }
}
EOF
 
$ awk -f context.awk PATTERN="myregex" filename1 filename2 ...

like in GNU unix we have grep -a and grep -b similar to that . will your solution works for .gz files also
# 4  
Old 12-14-2012
GNU unix is a contradiction in terms. GNU means "GNU's not UNIX". Smilie

Nope. Neither will grep. You can still stream it, of course.

Code:
gunzip < filename | nawk -f context.awk PATTERN="myregex"

# 5  
Old 12-14-2012
Slightly improved version:

Code:
cat <<"EOF" > context.awk
# Recall N lines ago up to 9 lines
function last(N)
{
        if(N>L) return("");
        return(LINE[(L-N)%CTX]);
}
 
{ LINE[(++L)%10]=$0 } # Remember line for later
 
$0 ~ PATTERN { for(N=CTX; N>=1; N--) print last(N);
        print;
        for(N=0; N<CTX; N++) { getline ; print }
}
EOF

Code:
$ gunzip < filename | awk -f context.awk CTX=3 PATTERN="myregex"

# 6  
Old 12-14-2012
Quote:
Originally Posted by Corona688
GNU unix is a contradiction in terms. GNU means "GNU's not UNIX". Smilie

Nope. Neither will grep. You can still stream it, of course.

Code:
gunzip < filename | nawk -f context.awk PATTERN="myregex"

Thanks a lot this what i need , one more question if i give *.gz to found the pattern in multipile gz file it's not working any idea about that
# 7  
Old 12-14-2012
If you have zcat, you can do zcat *.gz | nawk ...

If you don't, you can do for FILE in *.gz ; do gunzip < "$FILE" ; done | nawk ...
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