View Full Version : [ubuntu] Commandline tail -r
Surfer-07
December 5th, 2009, 03:27 PM
Hello everybody,
I'm having a problem using the command line.
For some script I need the "tail -r" command but in the new version of the command the -r option isn't available anymore.
Is it possible to downgrade the tail command or is there any alternative?
Grtz ;)
(I'm using Ubuntu 9.10 64bit)
phillw
December 5th, 2009, 04:34 PM
Hi,
what did the -r option used to do ?
Phill.
lswb
December 5th, 2009, 05:36 PM
I see that the version of tail on BSD systems includes the -r option. Looks like the GNU version does not.
Something like this will have the same effect:
tail filename|cat -n|sort -nr|cut -f2
Surfer-07
December 5th, 2009, 06:00 PM
Hi,
what did the -r option used to do ?
Phill.
Option '-r' stands for reverse. It puts the file content upside down.
For example:
bash~$ cat Test.txt
Line1
Line2
bash~$ tail -r Test.txt
Line2
Line1
I see that the version of tail on BSD systems includes the -r option. Looks like the GNU version does not.
Something like this will have the same effect:
tail filename|cat -n|sort -nr|cut -f2
That also works. You can even make it shorter:
cat -n filename | sort -nr | cut -f2 ;)
But is there no other alternative?
Grtz
Surfer-07
December 5th, 2009, 06:30 PM
I just found the solution.
There is a "tac" command that works great :)
just use bash:$ tac Test.txt
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