Package: coreutils Version: 9.0 Do please take a look at this example:
% printf '%s\n' just three lines | tee >f1 f2 % tail -n1 f1 lines % tail -n1 f* ==> f1 <== lines ==> f2 <== lines % tail -1 f1 lines % tail -1 f* tail: option used in invalid context -- 1 % tail --version | head -1 tail (GNU coreutils) 9.0 Note that with head and busybox tail, the outputs are unsurprising: % head -1 f* ==> f1 <== just ==> f2 <== just % head --version | head -1 head (GNU coreutils) 9.0 % busybox tail -1 f* ==> f1 <== lines ==> f2 <== lines % % uname -v #1 SMP Debian 4.19.194-3 (2021-07-18) regards, s h e h u
