setcap: add page (#9850)

* setcap: add page

* Update pages/linux/setcap.md

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/setcap.md

@@ -0,0 +1,25 @@
+# setcap
+
+> Set capabilities of specified file.
+> See also: `tldr getcap`.
+> More information: <https://manned.org/setcap>.
+
+- Set capability `cap_net_raw` (to use RAW and PACKET sockets) for a given file:
+
+`setcap '{{cap_net_raw}}' {{path/to/file}}`
+
+- Set multiple capabilities on a file (ep behind the capability means "effective permitted"):
+
+`setcap '{{cap_dac_read_search,cap_sys_tty_config+ep}}' {{path/to/file}}`
+
+- Remove all capabilities from a file:
+
+`setcap -r {{path/to/file}}`
+
+- Verify that the specified capabilities are currently associated with the specified file:
+
+`setcap -v '{{cap_net_raw}}' {{path/to/file}}`
+
+- The optional `-n {{rootuid}}` argument can be used to set the file capability for use only in a user namespace with this root user ID owner:
+
+`setcap -n {{rootuid}} '{{cap_net_admin}}' {{path/to/file}}`