Yiorgos
Reputation: 131
Append text to the last line of a file in unix
I want to append a colon character (:) at the end of the last line of a text file (not in a new line).
- My file already has a \n character at the end so
printf ":" >> fileputs the colon in a new line. - Using
sed '$s/$/:/' file > newfileworks, but my file is ~100 MB so piping the whole thing just to add a single character seems unattractive.
Is there a better solution?
Upvotes: 2
Views: 1139
Answers (1)
Thor
Reputation: 47099
You could go with dd and notrunc (tested on Linux 4.12):
printf ":" | dd of=file conv=notrunc bs=1 seek=$(( $(stat -c "%s" file) - 1))
Upvotes: 1
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