How do I reverse the order of files in Linux?

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

To sort in reverse order pass the -r option to sort . This will sort in reverse order and write the result to standard output. Using the same list of metal bands from the previous example this file can be sorted in reverse order with the -r option.

How do you reverse the order of lines in 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 I sort files in Linux?

How to Sort Files in Linux using Sort Command

  1. Perform Numeric Sort using -n option. …
  2. Sort Human Readable Numbers using -h option. …
  3. Sort Months of an Year using -M option. …
  4. Check if Content is Already Sorted using -c option. …
  5. Reverse the Output and Check for Uniqueness using -r and -u options.

What is $? In Unix?

The $? variable represents the exit status of the previous command. Exit status is a numerical value returned by every command upon its completion. … For example, some commands differentiate between kinds of errors and will return various exit values depending on the specific type of failure.

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How do I reverse the contents of a file?

5 ways to reverse the order of file content

  1. tac command is the reverse of cat. …
  2. This option uses a combination of commands to reverse the file order. …
  3. sed is the most trickiest of all. …
  4. awk solution is a pretty simple one. …
  5. perl solution is pretty simple due to the reverse function of perl.

What is reverse file?

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

How will you use sort and cut to read a file’s lines in reverse order?

3. nl/sort/cut Commands

  1. 3.1. nl. To be able to order the file in reverse order, we need an index for each row. …
  2. 3.2. sort. Now we want to sort these indexed lines into reverse order, for which we should use sort: $ nl /tmp/test | sort -nr 3 line_three 2 line_two 1 line_one. …
  3. 3.3. cut.

How do I print the contents of reverse order?

Initialise the array of length of the given message in the given file. Now rewind your file pointer and place the last pointer of the text to arr[K – 1] where K is the length of the array using fseek(). Print the length of the last line and decrease K by 1 for printing the next last line of the file.

How do I get a list of files in Linux?

See the following examples:

  1. To list all files in the current directory, type the following: ls -a This lists all files, including. dot (.) …
  2. To display detailed information, type the following: ls -l chap1 .profile. …
  3. To display detailed information about a directory, type the following: ls -d -l .
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How do I view files in Linux?

The easiest way to show hidden files on Linux is to use the ls command with the “-a” option for “all”. For example, in order to show hidden files in a user home directory, this is the command that you would run. Alternatively, you can use the “-A” flag in order to show hidden files on Linux.

How do I sort files?

To sort files in a different order, click one of the column headings in the file manager. For example, click Type to sort by file type. Click the column heading again to sort in the reverse order. In list view, you can show columns with more attributes and sort on those columns.

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