lessecho(1) on FreeBSD
The text 7f513d02a745, as FreeBSD 7.3-RELEASE, FreeBSD 7.2-RELEASE, FreeBSD 7.1-RELEASE, FreeBSD 7.0-RELEASE, FreeBSD 6.4-RELEASE, FreeBSD 6.3-RELEASE shipped it.
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Flags it lists
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-a -
-cx -
-dn -
-ex -
-fn -
-mx -
-nn -
-ox -
-pn