Cat is one of the most frequently used commands on Unix-like operating systems. It has three related functions with regard to text files: displaying them, combining copies of them and creating new ones.
cat [OPTION] [FILE]...
| No. | Options | Description |
|---|---|---|
| 1 | -b (GNU: --number-nonblank) | numbers only non-empty lines |
| 2 | -e implies -v (GNU only: -E the same, but without implying -v) | but also display end-of-line characters as $ |
| 3 | -n (GNU: --number) | number all output lines |
| 4 | -s (GNU: --squeeze-blank) | squeeze multiple adjacent blank lines |
| 5 | -t implies -v (GNU: -T the same, but without implying -v) | but also display tabs as ^I |
You need to develop a cat utility:
- Support of all flags (including GNU versions) specified above.
- The programs must be developed in C language of C11 standard using gcc compiler.
- Do not use outdated and legacy language constructions and library functions.
- When writing code it is necessary to follow the Google style.
- The program must be executable files with command line arguments.
- The program must be built with Makefile with appropriate targets: s21_cat.
- If third-party libraries are used, there must be build scripts in makefile to connect/load them.
- Integration tests must cover all flag variants and input values, based on a comparison with the behavior of real Bash utility.
- The programs must be developed according to the principles of structured programming.
- You can use standard and non-standard C libraries, or you can use your own developed libraries from other projects.
- The statement of the message in the case of an error does not matter.