Questions tagged [tac]
5 questions
12
votes
2 answers
Explanation of tac --before
-b, --before
The separator is attached to the beginning of the record that it
precedes in the file.
And I can't understand the following output:
$ echo -e "Hello\nNew\nWorld\n!" > file
$ tac file
!
World
New
Hello
$ tac -b…
SantaXL
- 355
- 1
- 15
6
votes
2 answers
reverse file character by character using tac
I want to use the tacto reverse a text file character by character. On the info page for coreutils I found an example saying: #Reverse a file character by character tac -r -s 'x\|[^x]'
However running tac -r -s seems to open standard input instead…
Weezy
- 529
- 1
- 6
- 16
2
votes
3 answers
Reversing a file line-wise and character-wise
Input:
hello
enrico
output:
ocirne
olleh
To do this, I can simply tac a file and pipe the output to rev (or the other way around), so one function that does the job is just this:
revtac() { tac "$@" | rev; }
Is there a built-in function for the…
Enlico
- 1,471
- 16
- 35
1
vote
3 answers
How to concatenate files in reverse order
I am looking to concatenate a list of files in a directory in the reverse order that they appear in the list.
This is different from tac as tac will concatenate the files with reversed line order.
Basically I have a folder with 3 files, file1, file2…
sarahParker
- 11
- 1
1
vote
1 answer
Usage of readarray and tac
I have a file containing "lines" of text, for now only two lines.
I need to create a reversed array of these lines - FIFO style.
Using "readarray" in this fashion works fine:
readarray -t FileArray < "$PWD$DEBUG_DIR$DEBUG_MENU"
When I attempt to…
user238756