How do I insert a line in the middle of a file in BASH?

Shell Programming and Scripting
1

I have tried

sed '/6/a text_to_inserted' file > newfile

but this inserts test_to_insert at random places in file and i want it in specific location, which is line 6.

can anyone help....

2

This solution will insert the new line between 5th and 6th line.

sed '6i\
This is the new line
' file
3

/usr/bin/ex - "$targfile" << _EOF_ 1>/dev/null 2>&1
${linenum_below}i
$source
.
wq!
_EOF_
if [[ $? -ne 0 ]]; then
# add error log here
fi

4

/6/ is a regular expression which matches the digit, 6. If you want line 6, leave out the slashes.

sed '6a\
text_to_insert
'
5

I have a $(whoami) in the line to be inserted and

sed '6a\
text_to_insert
'

is not recognizing it. it inserts $(whoami) instead of the username
any ideas??

6

Substitution and expansion is not performed within single quotes.

7

thanks johnson, much appreciate it