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BSD 2.11 - man page for shells (bsd section 5)

SHELLS(5)							File Formats Manual							 SHELLS(5)

shells - shell database
The shells file contains a list of the shells on the system. For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (``#'') indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the rou- tines which search the file. Blank lines are also ignored.
getusershell(3) 4.2 Berkeley Distribution February 23, 1989 SHELLS(5)