Hi all...
I not a expert unix script programmer, Kindly adjust.
My requirement is that, i have a file which contains the about 10 lines -
say
1
2
3
...
8 war of the worlds: => text in this line
9 9000,80,78,77,334,445 => this line contains some numbers separted by commas
10
now i know that i have to search for the string "war of the worlds" which I can just grep and get.. but I want the line immediately after this line.
can any body help !!!
thank you in advance
Boss.
Check your man page for the grep command - should have an option to print the line number that the text is in ( -n on my OS)
Thank you for that quick answer.. I tried it out..
and I got the line number as-
linenum=`cat $ROOT/$1/$2 | grep -n "war of worlds:"|cut -d: -f1`;
echo $linenum;
linen=`expr $linenum + 1`;
echo $linen;
now what do i do with this line number.. i am stuck again.. "cat" doesnt have a option to read the file with specified line number.
Actually i want to change the line after this line, say -
war of worlds:
200,300,400
to
war of worlds:
100,200,300,400 => append a 100, to the begining of this line..
Pls show some more light
thank you !!
Boss
You can use sed -n to get the content at a particular line
sed -n '2,3p' filename
echo -e "100,\c" ; sed -n '5 p' file1
sed '/war of worlds/{n;s/^/100,/;}' file1
Thank you everybody.. I tried all of them and they all work.. but the one by Ygor suits me best !! 
Thank you !
However, in this line -
sed '/war of worlds/{n;s/^/100,/;}' file1
the number 100 is not fixed. I need to run this shell script recursively and so this number should be the output of a variable, like
sed '/war of worlds/{n;s/^/$3,/;}' file1
But unfortunately, unix doesnt seem to replace the variable with its value and prints $3 instead of the value. Any workarounds ?
Boss
yep got it !!
just replaced the single quotes with double quotes and its all done !!
now it looks like -
sed "/war of worlds/{n;s/^/$3,/;}" file1
Thank you all !!
Is there anyway I can change this command and try to get , lets say 3 lines after the line which matches the pattern .
I am trying
sed '/war of worlds/{n ; 3p }' file1 .
But it doesnt work . I can get 1 line when I say
sed '/war of worlds/{n ; p }' file1 .
How do i get 3 lines .
There may be better solution than this ...
sed -n '/war of worlds/{n;p;n;p;n;p;};' file1
Thanks Bhargav. That works . So I guess if we have to get lets say x number of lines after the match , we'll just have to print it x number of times .