alarm expr
- Schedules a SIG2ALRM to be delivered after expr seconds.
chdir [ expr ]
- Changes the working directory. Uses $ENV{
"HOME"} or $ENV{"LOGNAME"} if expr is omitted.
chroot filename(dagger)
- Changes the root directory for the process and its children.
die [ list ]
- Prints the value of list to STDERR and exits with the current value of $! (errno). If $! is 0, exits with the value of ($? >> 8). If ($? >> 8) is 0, exits with 255. list defaults to \(odDied.\(cd
exec list
- Executes the system command in list; does not return.
exit [ expr ]
- Exits immediately with the value of expr, which defaults to 0 (zero). Calls END routines and object destructors before exiting.
fork
- Does a fork (2) system call. Returns the process ID of the child to the parent process and zero to the child process.
getlogin
- Returns the current login name as known by the system.
getpgrp [ pid ]
- Returns the process group for process pid (0, or omitted, means the current process).
getppid
- Returns the process ID of the parent process.
getpriority which, who
- Returns the current priority for a process, process group, or user.
glob pat
- Returns a list of filenames that match the shell pattern pat.
kill list
- Sends a signal to a list of processes. The first element of the list must be the signal to send (either numeric, or its name as a string).
setpgrp pid, pgrp
- Sets the process group for the pid (0 means the current process).
setpriority which, who, priority
- Sets the current priority for a process, process group, or a user.
sleep [ expr ]
- Causes the program to sleep for expr seconds, or forever if no expr. Returns the number of seconds actually slept.
syscall list
- Calls the system call specified in the first element of the list, passing the rest of the list as arguments to the call.
system list
- Does exactly the same thing as
exec list except that a fork is performed first, and the parent process waits for the child process to complete.
times
- Returns a 4-element array (0:$user, 1:$system, 2:$cuser, 3:$csystem) giving the user and system times, in seconds, for this process and the children of this process.
umask [ expr ]
- Sets the umask for the process and returns the old one. If expr is omitted, returns current umask value.
wait
- Waits for a child process to terminate and returns the process ID of the deceased process (-1 if none). The status is returned in $?.
waitpid pid, flags
- Performs the same function as the corresponding system call.
warn [ list ]
- Prints the message on STDERR like
die, but doesn't exit. list defaults to \(odWarning: something's wrong\(cd.