Unix replace file contents

Jay Kah Jay Kah 1 1 gold badge 3 3 silver badges 3 3 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Graeme 32k 6 6 gold badges 79 79 silver badges bronze badges. I imagine sed is capable of this, but it will be terribly clumsy.

This is where awk shines! The command substitution for the sed solution should be double quoted in case the file contains spaces or glob characters. Graeme: Thanks, updated! Feel free to make an editting. Show 2 more comments. Volker Siegel Volker Siegel Does this work on multi-lined files and files with special characters?

TrevorHickey it doesn't. I've solved it by making a bash function that can be reused in scripts. Rui F Ribeiro Join Date: Jun If the file2 contains only IP address Code :. And what is "ip" in this case? The name of the file? Don't get it And btw it will always be different on every execution, so adding it as a variable won't work. I am specifically looking for a SED or awk method. As you said, your file2 contains the ip address.

Oh, the second one works great, thanks a lot! Replace string of a file with a string of another file for matches using grep,sed,awk. I have a file comp. Sed: how to use file contents in replacement string. I want to replace a string by contents of file. What am I missing in the above sed How to insert file contents after nth occurrence of a string using sed?

Hi, I would like to know how, using sed, be able to insert contents of file2 in file1 after say the second occurrence of a given string? How to replace a string in a file with contents of another file? Hi, I have to replace a string in my first file with contents of second file.

On your screen, you will see:. To make a duplicate copy of a file, use the command cp. For example, to create an exact copy of the file called firstfile, you would type:. This results in two files with different names, each containing the same information. The cp command works by overwriting information. If you create a different file called thirdfile and then type the following command:.

Unix does not have a command specifically for renaming files. Instead, the mv command is used both to change the name of a file and to move a file into a different directory. To change the name of a file, use the following command format where thirdfile and file3 are sample file names :. This command results in the complete removal of thirdfile , but a new file called file3 contains the previous contents of thirdfile.

Like cp, the mv command also overwrites existing files. For example, if you have two files, fourthfile and secondfile, and you type the command. As a result, fourthfile is renamed secondfile , but in the process secondfile is deleted. You may remove more than one file at a time by specifying a list of files to be deleted. For example,. Type y or yes to remove a file; type n or no to leave it intact. The directory that you create will be a subdirectory within your current directory.

For details on how to navigate directories and display the files and directories they contain, see List Contents and Navigate Unix Directories. The mv and cp commands can be used to put files into a directory. Assume that you want to place some files from your current directory into a newly created directory called project1.

The command. There will now be two copies of chapter1 , one in the current directory and one in project1. You can also use the mv command to rename and move directories.

When you type the command. If directory project2 already existed before the mv command was issued,.