Bash Query: how to append string variable to end of a specific line dictated by a int variable?

Asked Oct 31 '20 at 13:16

Active Oct 31 '20 at 14:01

Viewed 29 times

This is the code for appending string to a specific line number:

sed -e '1s/$/has/' -i testapend.txt

However, how would you be able to do the same thing but using a variable for the string and for the line number (int)?

I have so far tried inserting $variable into the slashes and chucking in braces, but it either says unknown command or extra characters after the command.

edited Oct 31 '20 at 14:01

terdon

242,166

asked Oct 31 '20 at 13:16

Jerry

3

Use double quotes. – Arkadiusz Drabczyk Oct 31 '20 at 13:18
@ArkadiuszDrabczyk So like this? Because it is not working.
linenum=3

append="Hello"

sed -e '/"$linenum"/ s/$/"$append"/' -i testapend.txt

I have also tried using sed -e "/$linenum/ s/$/$append/" -i testapend.txt and its still not working.
– Jerry Oct 31 '20 at 13:23
almost there: sed -e "$linenum s/$/$append/" (untested) – JJoao Oct 31 '20 at 13:43
1

However, if append contains a /, the s/// command becomes invalid syntax. – Paul_Pedant Oct 31 '20 at 14:08

Bash Query: how to append string variable to end of a specific line dictated by a int variable?

0 Answers0