Shell Programming and Scripting

i wanna insert a row in a file.

I m using this command to insert a row in the 13th line.
sed '13i\
NewRow' MyFile > temp.txt
mv temp.txt to MyFile

this works fine.
now i wanna get the line no using grep into a variable and then use tht variable to insert a new row..
how to do this wid sed..
i tried this in vain

v1=13
sed -v var=$v1 '$vari\
NEWROW ' MyFile

sed can do all, and if you sed support -i you don't have to use the temp file.

Code:

sed -i "/pattern/ s/$/\nNEWROW/" file

call sed with

Code:

echo "NEW LINES CONTENT" | sed ..your..stuff....

it echos the stuff and with the pipe it goes to sed, just like it came from a file.
but leave away the input file in the sed command ofcourse

i got this err..

> sed -i "/pattern/ s/$/\nNew Row/" filesed: illegal option -- i
Usage: sed [-n] Script [File ...]
sed [-n] [-e Script] ... [-f Script_file] ... [File ...]

help me again pls..

Remove the -i and use a temp file.

Code:

sed "/pattern/ s/$/\nNew Row/" file > temp && mv temp file

thnx..

but 1 more thing.. '\n' doesnt work gives the new line data in the same line..

sed "/pattern/ s/$/\nNew Row/" file

output
old data1
old data2
old data3
old data4
old data5
old data6nNew Row
old data7

guys rep pls!!!


i hv one more prob.. now this is another simple stuff tht i m stuck wid..

i wanna use grep in a if-else statement... but thrs a prob here

if [ !( grep -q pattern1 MyFile) -o !( grep -q pattern2 MyFile) ]
then
echo hi
else
echo hello
fi

now here i want the if part to execute only if pattern1 or 2 is not thr..

actu thrs no else part to this but i just wanted to chk wht was returned by the condition..

doing these checks individually is an option but i wanna put it in one condition only..

pls help in both cases!!!