Implementation of cat and grep utilities using the C programming language.
This is a project I did while attending programming school. Main goal of this project is to familirize myself with the C programming language and structured programming. These implementations are far worse than those provided by GNU and BSD in terms of, at least, performance. All of the code is pretty much straightforward and does not buffer the output, for example, that may be a huge boost to pefromance. I might try to do that later. Though implementation of cat found in this repository works better with non-ASCII characters compared to implementation provided by BSD (which is used in macOS, for example).
$ cd src/cat
$ make
$ cd src/grep
$ make
| No. | Options | Description |
|---|---|---|
| 1 | -b (GNU: --number-nonblank) | number only non-empty lines |
| 2 | -e implies -v (GNU only: -E the same, but without implying -v) | but also display LFD 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 TAB as ^I |
| 6 | -v | use ^ and M- notation, except for LFD and TAB |
| No. | Options | Description |
|---|---|---|
| 1 | -e <pattern> | supply pattern |
| 2 | -i | ignore uppercase vs. lowercase |
| 3 | -v | invert match |
| 4 | -c | output count of matching lines only |
| 5 | -l | output matching files only |
| 6 | -n | precede each matching line with a line number |
| 7 | -h | output matching lines without preceding them by file names |
| 8 | -s | suppress error messages about nonexistent or unreadable files |
| 9 | -f <file> | take patterns from a file |
| 10 | -o | output the matched parts of a matching line |