Your question: How do you reverse the contents of a file in Unix?

How do I reverse the contents of a file in Linux?

Linux – Displaying a File in Reverse

1. To view a file in reverse, there is simply the tac command. It is actually the CAT written in reverse: tac file.
2. Like the command cat, you can concatenate several files, which will be put together, but in reverse: tac file1 file2 file3.

How do I reverse the lines of a file?

The idea is to do the following:

1. For each line move it to line 1 (to reverse). Command is g/^/m0 . …
2. Print everything. Command is %p . …
3. Forcefully quit without saving the file. Command is q! .

How do you change the contents of a file in Unix?

The procedure to change the text in files under Linux/Unix using sed:

1. Use Stream EDitor (sed) as follows:
2. sed -i ‘s/old-text/new-text/g’ input. …
3. The s is the substitute command of sed for find and replace.
4. It tells sed to find all occurrences of ‘old-text’ and replace with ‘new-text’ in a file named input.

How do I find the command in Unix?

The find command in UNIX is a command line utility for walking a file hierarchy. It can be used to find files and directories and perform subsequent operations on them. It supports searching by file, folder, name, creation date, modification date, owner and permissions.

How do I reverse print in Unix?

Print File in Reverse Using Unix Command

1. 1.The tac command in unix can be used to print the file in reverse. The tac command is. tac file.txt.
2. The sed command for reversing the lines in a file is. sed ‘1! G;h;$!d’ file.txt.
3. Another usage of sed command is. sed -n ‘1! G;h;$p’ file.txt.

What command is used to sort the lines of data in a file in reverse order?

sort-r is the Command used to sort the line of data in a file in reverse order.

How do I change the content of a file?

Right-click the document file the content of which you want to replace. Press the Alt key and select Operations > Replace with File… from the menu bar. Locate and select the file that you want to use for replacing the original file content.

How do I change the content of a file in Linux?

Edit the file with vim:

1. Open the file in vim with the command “vim”. …
2. Type “/” and then the name of the value you would like to edit and press Enter to search for the value in the file. …
3. Type “i” to enter insert mode.
4. Modify the value that you would like to change using the arrow keys on your keyboard.

What is awk Unix command?

Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators. … Awk is mostly used for pattern scanning and processing.