Create a free Team What is Teams? Learn more. How to insert text before the first line of a file? Ask Question. Asked 8 years, 2 months ago. Active 2 months ago. Viewed k times. Any suggestion? Improve this question. Manolo Manolo 1, 2 2 gold badges 9 9 silver badges 11 11 bronze badges. Add a comment. Active Oldest Votes. Improve this answer.
It doesn't work without -i option. I'll update your answer before accepting. What OS are you using? Original solution worked on OpenSuse 9. I'm on Lubuntu Here, using sed GNU sed 4. Thanks — ton. Does not work on empty files. Show 10 more comments. Ankit Shah Ankit Shah 4 4 silver badges 6 6 bronze badges. Please let me know why the following is downvoted — Ankit Shah. Perhaps because the OP mentions sed. That does not deserve a down vote in my opinion. That solution was even the best fitting my needs, then upvoted.
I upvoted. Zombo Zombo 5, 5 5 gold badges 39 39 silver badges 58 58 bronze badges. GAD3R I get "awk: fatal: can't open source file 'inplace' for reading" GNU Awk 4.
Joseph R. The question is not about the -i switch. How do you figure that? It is an answer to the question. Yes, it's similar to the accepted answer, but not exactly the same.
Join Date: Sep If you want to pass explicitly the line numbers and the values to print Code :. Insert line based on found string.
Hi All I'm trying to insert a new line at the before each comment line in a file. Comment lines start with ' ' there are other comments with in lines but I don't want a new line there. Example file: blah blah do not insert here this is a comment blah some more another comment How to insert random numbers into each line? I have a file contains thousands of lines. I want to insert n random numbers into each line at specific position.
Like this: 0 22…… 1 33…… …… …… I want to insert 3 random numbers from position 2 to 4 into each line. Assigning rank to rows of numbers based on the last column. I have a tab delimited text file that looks like the following: ERBB3 0. Hi All, I have one file name called test.
I need to identified next available number with use of unix shell scipt and have to update next available number with use of unix shell script. Example:- cat test.
Splitting file based on line numbers. Extract rows from file based on row numbers stored in another file. Hi All, I have a file which is like this: rows. Can anyone please help! If the line does not match the pattern then goto L0 which prints the line.
If the line matches the pattern, then print the line first, extract the next line and delete it. Save my name, email, and website in this browser for the next time I comment. Notify me of followup comments via e-mail. All rights reserved Terms of Service. This article is part of the on going Unix sed command tutorial series. Sed provides lot of commands to perform number of operations with the lines in a file. Ramesh Natarajan December 10, , pm. Balast July 3, , pm.
Hi, How to insert content of file1 on the top of the file2, file3, file4, etc in same directory? Manish November 4, , am. Hi How I can escape Back slashes in sed. Anonymous December 1, , am. Balaji May 6, , am. David Liontooth June 18, , am. I nominate for the best set of sed instructions on the Internet. I want to change the first line of a csv file into lower case. How to do that. Steve August 27, , pm. Carlos Luna November 3, , pm.
Anyhow hope it helps.
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