bash reverse lines

1. How do I reverse a file line by line?
2. How do I reverse in bash?
3. How do you reverse a line in Linux?
4. How do you reverse a line in Unix?
5. How do I read a text file in reverse?
6. What Linux command can read a file in reverse?
7. What command is used to reverse a string?
8. How do you reverse output?
9. How do you reverse an output order?
10. How do I reverse a line in Vim?
11. What does TAC do in Linux?
12. How do I view a dot file in Linux?

How do I reverse a file line by line?

Use tac file. txt | head -n n if your tail does not have the -r option. For Emacs users: C-x h (select the whole file) and then M-x reverse-region . Also works for only selecting parts or the lines and reverting those.

How do I reverse in bash?

HowTo: Reverse a String In Unix / Linux Shell?

1. echo "nixcraft" | rev.
2. rev<<<"This is a test"
3. perl -ne 'chomp;print scalar reverse . "\ n";'<<<"nixcraft"
4. echo 'nixcraft' | perl -ne 'chomp;print scalar reverse . "\ n";'
5. #!/bin/bash input="$1" reverse="" len=$#input for (( i=$len-1; i>=0; i-- )) do reverse="$reverse$input:$i:1" done echo "$reverse"

How do you reverse a line in Linux?

rev command in Linux is used to reverse the lines characterwise. This utility basically reverses the order of the characters in each line by copying the specified files to the standard output. If no files are specified, then the standard input will read.

How do you reverse a line in Unix?

5 ways to reverse the order of file content

1. tac command is the reverse of cat. It simply prints the file in reverse order. ...
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.

How do I read a text file in reverse?

Use reversed() to read a file line by line backwards

Call open(filename, mode) with "r" as mode to read filename as a stream. Call file. readlines() with this stream as file to return a list containing each line of the file. Call reversed(list) to reverse the contents of list .

What Linux command can read a file in reverse?

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.

What command is used to reverse a string?

rev command : It is used to reverse the lines in a file.

How do you reverse output?

To reverse an output posting

1. Choose the. icon, enter Output Journal, and then choose the related link. ...
2. Fill in the fields as necessary. For more information, see Batch Post Output and Run Times.
3. In the Applies-To Entry field, select the associated item ledger entry. ...
4. Post the reversal by posting the journal.

How do you reverse an output order?

Microsoft Word has a single command that forces the printer to reverse print every print job:

1. Open Word, then click Options > Advanced.
2. Scroll through and come to the Print section on the right.
3. When you want to reverse print a page, select the Print Pages in Reverse Order check box.

How do I reverse a line in Vim?

Source: Reverse all lines and Power of g at vim wikia. -r The -r option causes the input to be displayed in reverse order, by line.

What does TAC do in Linux?

tac command in Linux is used to concatenate and print files in reverse. This command will write each FILE to standard output, the last line first. When no file is specified then this command will read the standard input.

How do I view a dot file in Linux?

To view hidden files, run the ls command with the -a flag which enables viewing of all files in a directory or -al flag for long listing. From a GUI file manager, go to View and check the option Show Hidden Files to view hidden files or directories.