Tail with positive offset


 
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# 1  
Old 01-29-2012
Tail with positive offset

I have read the below from the book bash cookbook.
Code:
Tail +1 filenames

is similar to
Code:
cat filename

I have tried the same in Ubuntu 11.10 with bash. 4.0 .
I have received error for the Same.
May I know in which system that will work fine ?
Thanks
# 2  
Old 01-29-2012
It works fine on older systems. Run info coreutils 'tail invocation' on your system:

Code:
   For compatibility `tail' also supports an obsolete usage `tail
-[COUNT][bcl][f] [FILE]', which is recognized only if it does not
conflict with the usage described above.  This obsolete form uses
exactly one option and at most one file.  In the option, COUNT is an
optional decimal number optionally followed by a size letter (`b', `c',
`l') to mean count by 512-byte blocks, bytes, or lines, optionally
followed by `f' which has the same meaning as `-f'.

   On older systems, the leading `-' can be replaced by `+' in the
obsolete option syntax with the same meaning as in counts, and obsolete
usage overrides normal usage when the two conflict.  This obsolete
behavior can be enabled or disabled with the `_POSIX2_VERSION'
environment variable (*note Standards conformance::).

So you can enable the obsolete behavior with _POSIX2_VERSION:

Code:
% lsb_release -d
Description:    Ubuntu 11.10
% _POSIX2_VERSION=199209 tail +1 /etc/issue
Ubuntu 11.10 \n \l

%

Or just the modern syntax (you just need to add -n):
Code:
% tail -n +1 /etc/issue
Ubuntu 11.10 \n \l

%

This User Gave Thanks to radoulov For This Post:
 
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