I'm using Ubuntu. I have an fileName.sh file containing 1000 lines and I have to delete the 399 number line is this command is sufficient for the deleting the line.
Command:- sed -i '399d' test.sh
Is there any need to change in this command? And can you please give me more suggestions to delete the line from a file?
Better (but stiull unsafe) to remove the line using its contents than using a line number. If you want to delete a line whose contents are known:
sed -i /{contents}/d in.sh
Another solution is to use grep -v:
grep -v '{contents}' <in.sh >out.sh
In both cases {contents} is a regexp that matches the contents you want to remove, knowing that strings with only letters and numbers and a few select special characters are regular expressions for themselves, so:
sed -i /somefile/d in.sh
grep -v 'somefile' <in.sh >out.sh
will remove any line containing somefile from the input. But keep in mind that they could also match more things (for instance somefile2 would also be matched) unless you start using more complete regexps, for instance using ^{contents}$ to match lines that are exactly {contents}, excluding those that contain {contents} and additional things.
