sin EXPR sin Returns the sine of EXPR (expressed in radians). If EXPR is omitted, returns sine of $_ . For the inverse sine operation, you may use the Math::Trig::asin function, or use this relation: sub asin { atan2($_[0], sqrt(1 - $_[0] * $_[0])) }

NAME SYNOPSIS DESCRIPTION OPTIONSSIGNAL HANDLERS SIGNAL LISTS OTHER EXAMPLES NAME sigtrap - Perl pragma to enable simple signal handling SYNOPSIS use sigtrap; use sigtrap qw(stack-trace old-interface-signals); # equivalent use sigtrap qw(BUS SEGV PIPE ABRT); use sigtrap qw(die INT QUIT); use sigtrap qw(die normal-signals); use sigtrap qw(die untrapped normal-signals); use sigtrap qw(die untrapped normal-signals stack-trace any error-signals); use sigtrap 'han

shutdown SOCKET,HOW Shuts down a socket connection in the manner indicated by HOW, which has the same interpretation as in the syscall of the same name. shutdown(SOCKET, 0); # I/we have stopped reading data shutdown(SOCKET, 1); # I/we have stopped writing data shutdown(SOCKET, 2); # I/we have stopped using this socket This is useful with sockets when you want to tell the other side you're done writing but not done reading, or vice versa. It's also a more insistent form of close becaus

shmwrite ID,STRING,POS,SIZE Reads or writes the System V shared memory segment ID starting at position POS for size SIZE by attaching to it, copying in/out, and detaching from it. When reading, VAR must be a variable that will hold the data read. When writing, if STRING is too long, only SIZE bytes are used; if STRING is too short, nulls are written to fill out SIZE bytes. Return true if successful, false on error. shmread() taints the variable. See also SysV IPC in perlipc, IPC::SysV , and the

shmread ID,VAR,POS,SIZE

shmget KEY,SIZE,FLAGS Calls the System V IPC function shmget. Returns the shared memory segment id, or undef on error. See also SysV IPC in perlipc and IPC::SysV documentation. Portability issues: shmget in perlport.

shmctl ID,CMD,ARG Calls the System V IPC function shmctl. You'll probably have to say use IPC::SysV; first to get the correct constant definitions. If CMD is IPC_STAT , then ARG must be a variable that will hold the returned shmid_ds structure. Returns like ioctl: undef for error; "0 but true" for zero; and the actual return value otherwise. See also SysV IPC in perlipc and IPC::SysV documentation. Portability issues: shmctl in perlport.

Shift Operators Binary "<<" returns the value of its left argument shifted left by the number of bits specified by the right argument. Arguments should be integers. (See also Integer Arithmetic.) Binary ">>" returns the value of its left argument shifted right by the number of bits specified by the right argument. Arguments should be integers. (See also Integer Arithmetic.) Note that both << and >> in Perl are implemented directly using << and >> in C. If us

shift ARRAY shift EXPR shift Shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down. If there are no elements in the array, returns the undefined value. If ARRAY is omitted, shifts the @_ array within the lexical scope of subroutines and formats, and the @ARGV array outside a subroutine and also within the lexical scopes established by the eval STRING , BEGIN {} , INIT {} , CHECK {} , UNITCHECK {} , and END {} constructs. Starting with Perl

NAME SYNOPSIS DESCRIPTION AUTHOR SEE ALSO NAME shasum - Print or Check SHA Checksums SYNOPSIS Usage: shasum [OPTION]... [FILE]... Print or check SHA checksums. With no FILE, or when FILE is -, read standard input. -a, --algorithm 1 (default), 224, 256, 384, 512, 512224, 512256 -b, --binary read in binary mode -c, --check read SHA sums from the FILEs and check them -t, --text read in text mode (default) -U, --UNIVERSAL read in Universal Newlines mode