public/subjects/ztail

ztail

Instructions

Write a program that behaves like a simplified tail command but which takes at least one file as argument.

The only option to be handled is -c and will be used in all the tests as the first argument, with positive values.

For this program the os package can be used.

Handle the errors by returning a non-zero exit status but process all the files.

If several files are given, print a new line and the file name between each one of them (see below).

Usage

If file1.txt & file2.txt contains :

abcdefghijklmnopqrstuvwxyz

Normal cases :

$ go run . -c 4 file1.txt
xyz
$ go run . -c 4 file1.txt file2.txt
==> file1.txt <==
xyz

==> file2.txt <==
xyz
$

Error cases :

$ go run . -c 4 file1.txt nonexisting1.txt file2.txt nonexisting2.txt
==> file1.txt <==
xyz
open nonexisting1.txt: no such file or directory

==> file2.txt <==
xyz
open nonexisting2.txt: no such file or directory
$ echo $?
1
$