|
|
|
|
## ztail
|
|
|
|
|
|
|
|
|
|
### Instructions
|
|
|
|
|
|
|
|
|
|
Write a program that behaves like a simplified `tail` command that takes at least one file as an 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 newline and the file name between each one of them (see below).
|
|
|
|
|
|
|
|
|
|
### Usage
|
|
|
|
|
|
|
|
|
|
If `file1.txt` & `file2.txt` contains :
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
abcdefghijklmnopqrstuvwxyz
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
**Note** that the files above end with a new line.
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
$
|
|
|
|
|
```
|
