sed '$i d' // Deleting a line with linenumber in var

Question

Hi i have a linenumber

i=10

Now I want to delete that line with sed

sed '$i d' file 

But it looke like that this wont work..

any ideas?

Answer 1

In awk. First test material:

$ cat > foo
1
2
3

Set the i:

$ i=2

Awk it:

$ awk -v line="$i" 'NR!=line' foo
1
3

Answer 2

sed -i.bak "${i}d" data.txt

is what you're looking for.

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Notes

• The -i option with sed is used for inplace edit. A backup with extension .bak is created.
• The double quotes with sed expands the shell variables

Answer 3

To delete second line and show result:

sed -e '2d' data.txt

So your answer is:

sed -e "$i d" file.txt > file.txt

Answer 4

Just add strong quotes around the quoted variable:

i=10
sed ''"$i"' d' file