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Page 1195 String Capabilities
There are several ways of defining the control codes for string capabilities: Normal characters except ^, \, and % represent themselves. A ^x means Ctrl+x. Ctrl+A equals 1 decimal. \x means a special code. x can be one of the following characters:
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If you use binary output, then you should avoid the null character because it terminates the string. You should reset tabulator expansion if a tabulator can be the binary output of a parameter. Warning: The preceding metacharacters for parameters may be wrong; they document Minix termcap, which may not be compatible with Linux termcap. The block graphic characters can be specified by three string capabilities:
The following names are available:
Page 1197 The values in parentheses are suggested defaults that are used by curses if the capabilities are missing. SEE ALSO termcap(3), curses(3), terminfo(5) Linux ttytypettytype—Terminal name and device list. DESCRIPTION The /etc/ttytype file associates termcap/terminfo terminal type names with tty lines. Each line consists of a terminal type, followed by whitespace, followed by a tty name (a device name without the /dev/ prefix). This association is used by the program tset(1) to set the environment variable TERM to the default terminal name for the user's current tty. This facility was designed for a traditional time-sharing environment featuring character-cell terminals hardwired to a UNIX minicomputer. It is little used on modern workstation and personal UNIXes. EXAMPLE A typical /etc/ttytype is con80x25 tty1 vt320 ttys0 FILES
SEE ALSO getty(1), terminfo(5), termcap(5) Linux, 24 July 1993 tzfiletzfile—Time zone information. SYNOPSIS #include <tzfile.h> DESCRIPTION The time zone information files used by tzset(3) begin with bytes reserved for future use, followed by six four-byte values of type long, written in a "standard" byte order (the high-order byte of the value is written first). These values are, in order
Page 1198 The preceding header is followed by tzh_timecnt four-byte values of type long, sorted in ascending order. These values are written in "standard" byte order. Each is used as a transition time (as returned by time(2)) at which the rules for computing local time change. Next come tzh_timecnt one-byte values of type unsigned char; each one tells which of the different types of "local time" types described in the file is associated with the same-indexed transition time. These values serve as indices into an array of ttinfo structures that appears next in the file; these structures are defined as follows:
struct ttinfo {
long tt_gmtoff;
int tt_isdst;
unsigned int tt_abbrind;
};
Each structure is written as a four-byte value for tt_gmtoff of type long, in a standard byte order, followed by a one-byte value for tt_isdst and a one-byte value for tt_abbrind. In each structure, tt_gmtoff gives the number of seconds to be added to GMT, tt_isdst tells whether tm_isdst should be set by localtime(3) and tt_abbrind serves as an index into the array of time zone abbreviation characters that follow the ttinfo structures in the file. Then there are tzh_leapcnt pairs of four-byte values, written in standard byte order; the first value of each pair gives the time (as returned by time(2)) at which a leap second occurs; the second gives the total number of leap seconds to be applied after the given time. The pairs of values are sorted in ascending order by time. Then there are tzh_ttisstdcnt standard/wall indicators, each stored as a one-byte value; they tell whether the transition times associated with local time types were specified as standard time or wall clock time and are used when a time zone file is used in handling POSIX-style time zone environment variables. Finally, there are tzh_ttisgmtcnt GMT/local indicators, each stored as a one-byte value; they tell whether the transition times associated with local time types were specified as GMT or local time and are used when a time zone file is used in handling POSIX-style time zone environment variables. Localtime uses the first standard-time ttinfo structure in the file (or simply the first ttinfo structure in the absence of a standard-time structure) if either tzh_timecnt is zero or the time argument is less than the first transition time recorded in the file. SEE ALSO newctime(3) utmp, wtmputmp, wtmp—Login records. SYNOPSIS #include <utmp.h> DESCRIPTION The utmp file allows you to discover information about who is currently using the system. There may be more users currently using the system because not all programs use utmp logging. Warning: utmp must not be writable because many system programs depend on its integrity. You risk faked system log files and modifications of system files if you leave utmp writable to any user. The file is a sequence of entries with the following structure declared in the include file: #define UT_UNKNOWN 0 #define RUN_LVL 1 #define BOOT_TIME 2 #define NEW_TIME 3 #define OLD_TIME 4 |
