rargs: add page (#11603)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/osx/rargs.md

@@ -0,0 +1,25 @@
+# rargs
+
+> Execute a command for each line of standard input.
+> Like `xargs`, but with pattern matching support.
+> More information: <https://github.com/lotabout/rargs>.
+
+- Execute a command for every line of input, just like `xargs` (`{0}` indicates where to substitute in the text):
+
+`{{command}} | rargs {{command}} {0}`
+
+- Do a dry run, which prints the commands that would be run instead of executing them:
+
+`{{command}} | rargs -e {{command}} {0}`
+
+- Remove the `.bak` extension from every file in a list:
+
+`{{command}} | rargs -p '(.*).bak mv {0} {1}`
+
+- Execute commands in parallel:
+
+`{{command}} | rargs -w {{max-procs}}`
+
+- Consider each line of input to be separated by a NUL character (`\0`) instead of a newline (`\n`):
+
+`{{command}} | rargs -0 {{command}} {0}`