expand: add page (#917)

pages/linux/expand.md

@@ -0,0 +1,23 @@
+# expand
+
+> Convert tabs to spaces.
+
+- Convert tabs in each file to spaces, writing to standard output:
+
+`expand {{file}}`
+
+- Convert tabs to spaces, reading from standard input:
+
+`expand`
+
+- Do not convert tabs after non blanks:
+
+`expand -i {{file}}`
+
+- Have tabs a certain number of characters apart, not 8:
+
+`expand -t={{number}} {{file}}`
+
+- Use comma separated list of explicit tab positions:
+
+`expand -t={{list}}`