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Using the sed -i (inline), you can replace the beginning of the first line of a file without redirecting the output to a temporary location.
5sed -i '1s/^/text to prepend\n/' file1 -
Syntax: $ prepend content to add [filename] Uses ed, so no temp files created.
3prepend () { array=("$@"); len=${#array[@]}; file=${array[$len-1]}; text=${array[@]:0:$len-1}; printf '%s\n' 0a "$text" . w | ed -s "$file"; } -
The original command is great, but I often want to prepend to every line. Show Sample Output
2sed -i 's/^/ls -l /' output_files.txt -
Prepend text to a file. It doen't need temporary files, ed or sed.
1echo "text to prepend" | cat - file
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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cat <(echo my prefix) file. Then you can go one step futher and add a suffix:cat <(echo my prefix) file <(echo my suffix)