Base: Add manpages for cut, diff, head & rmdir command line utilities

Base/usr/share/man/man1/cut.md

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+## Name
+
+cut - remove sections from each line of files
+
+## Synopsis
+
+```**sh
+$ cut option... [file...]
+```
+
+## Description
+
+Print selected parts of lines from each FILE to standard output.
+
+With no FILE, or when FILE is -, read standard input.
+
+## Arguments
+
+* `file`: File(s) to cut
+
+## Options
+
+* `-b` `--bytes=list`: Select only these bytes
+* `-f` `--fields=list`: select only these fields; also print any line that contains no delimiter character
+* `-d` `--delimiter=delim`: use `delim` instead of `tab` for field delimiter
+
+
+## Examples
+
+```sh
+$ cat example.txt
+245:789 4567    M:4540  Admin   01:10:1980
+535:763 4987    M:3476  Sales   11:04:1978
+
+# Display first and third fields from file example.txt
+$ cut example.txt -f 1,3
+245:789	M:4540
+535:763	M:3476
+
+# Display first and third fields using `:` as a delimiter 
+$ cut example.txt -d ':' -f 1,3
+245:4540	Admin	01
+535:3476	Sales	11
+
+# Display bytes at given position 
+$ echo "serenity is cool" | cut -b 5
+n
+
+```