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 Section All Sections 1 - General Commands 2 - System Calls 3 - Subroutines 4 - Special Files 5 - File Formats 6 - Games 7 - Macros and Conventions 8 - Maintenance Commands 9 - Kernel Interface n - New Commands
 asinh(3) -- inverse hyperbolic sine function The asinh() function calculates the inverse hyperbolic sine of x; that is the value whose hyperbolic sine is x. assert(3) -- Abort the program if assertion is false. assert() prints an error message to standard output and terminates the program by calling abort() if expression is false (i.e., compares equal to zero). This only happens when the macro NDEBUG was und...
atan(3) -- arc tangent function
The atan() function calculates the arc tangent of x; that is the value whose tangent is x.
atan2(3) -- arc tangent function of two variables
The atan2() function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the q...
atanh(3) -- inverse hyperbolic tangent function
The atanh() function calculates the inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x. If the absolute value of x is greater than 1.0, acosh() returns not-a-number (NaN)...
atexit(3) -- register a function to be called at normal program termination.
The atexit() function registers the given function to be called at normal program termination, whether via exit(3) or via return from the program's main. Functions so registered are called in the rev...
atof(3) -- convert a string to a double.
The atof() function converts the initial portion of the string pointed to by nptr to double. The behaviour is the same as strtod(nptr, (char **)NULL); except that atof() does not detect errors.
atoi(3) -- convert a string to an integer.
The atoi() function converts the initial portion of the string pointed to by nptr to int. The behaviour is the same as strtol(nptr, (char **)NULL, 10); except that atoi() does not detect errors. The a...
barchart(3) -- Bar chart for plotting X-Y coordinate data.
The barchart command creates a bar chart for plotting two-dimensional data (X-Y coordinates). A bar chart is a graphic means of comparing numbers by displaying bars of lengths proportional to the y-co...
basename(3) -- Parse pathname components
dirname and basename break a null-terminated pathname string into directory and filename components. In the usual case, dirname returns the string up to, but not including, the final '/', and basena...
bcmp(3) -- compare byte strings
The bcmp() function compares the first n bytes of the strings s1 and s2. If the two strings are equal, bcmp() returns 0, otherwise it returns a non-zero result. If n is zero, the two strings are assum...
bcopy(3) -- copy byte strings
The bcopy() function copies the first n bytes of the source string src to the destination string dest. If n is zero, no bytes are copied.
beep(3) -- curses bell and screen flash routines
The beep and flash routines are used to alert the terminal user. The routine beep sounds an audible alarm on the terminal, if possible; otherwise it flashes the screen (visible bell). The routine flas...
bgexec(3) -- Run programs in the background while handling Tk events.
The bgexec command executes programs in the background, allowing Tk to handle events. A global Tcl variable varName is set when the program has completed.
bindresvport(3) -- bind a socket to a privileged IP port
bindresvport() is used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023. The routine returns 0 if it is successful, otherwise -1 is returned and errno se...
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