8 нояб. 2013 г. · Use sed 's insert ( i ) option which will insert the text in the preceding line. sed '1 i\. Question author's update:.

22 авг. 2013 г. · You can do this in a single command with ed like so: ed -s file << 'EOF' 0a prepend these lines to the beginning . $a append these lines to the end .

17 янв. 2018 г. · The simple solution is to copy the original file to file.bck, append the new lines to the file, and append file.bck to the file. But this isn't an elegant ...

12 янв. 2017 г. · To insert a # in the beginning of the second line of a text, you may use sed like this: sed '2 s/./#&/' input.txt >output.txt

23 нояб. 2019 г. · I'm trying to insert a string "hello world" before of a text file named "test.txt", i already do it with sed, but unfortunately "sed command" kill my memory, ...

6 мая 2016 г. · echo and cat are enough to do what you want : echo "Description of the following table:" | cat - file The - argument tells cat to read from stdin.

4 мая 2017 г. · I'm trying to insert a line at the top of my file so I have header_line="first_line_of_file" ... sed -i "1 i\$header_line" /tmp/$file_title

5 янв. 2021 г. · As a solution, you can enclose the instructions in double quotes: sed -i "1s/^/$var\n/" file.txt Note however that I would recommend using the "insert" command ...

8 мая 2018 г. · I have a directory called backup with file extensions *.sql. The thing I want to do is to prepend a line to all sql files in the directory backup.

21 мая 2018 г. · With sed sed 's/^%/%%/' infile replace beginning % with %% for the lines if starts with. The ^ is an anchor which points to the beginning of the line.