fc EXPR fc Returns the casefolded version of EXPR. This is the internal function implementing the

cos EXPR cos Returns the cosine of EXPR (expressed in radians). If EXPR is omitted, takes the cosine of

split /PATTERN/,EXPR,LIMIT split /PATTERN/,EXPR split /PATTERN/ split

sleep EXPR sleep Causes the script to sleep for (integer) EXPR seconds, or forever if no argument is given

endgrent

recv SOCKET,SCALAR,LENGTH,FLAGS Receives a message on a socket. Attempts to receive LENGTH characters of data into variable SCALAR from the

atan2 Y,X Returns the arctangent of Y/X in the range -PI to PI. For the tangent operation, you may use the

getnetbyname NAME

times Returns a four-element list giving the user and system times in seconds for this process and any exited children of this process.

rmdir FILENAME rmdir Deletes the directory specified by FILENAME if that directory is empty. If it succeeds