UNIX System access commands

These commands provide access to many basic UNIX System facilities, including process, date and time, and signal handling; linking and unlinking files; setting file, process, and user attributes; and shell command execution.

Available commands are:

alarm(TCL)

sends a SIGALARM in a specified number of seconds

chgrp(TCL)

sets the group ID for files in a specified list

chmod(TCL)

sets permissions of files in a specified list

chown(TCL)

sets the owner of files in specified list

convertclock(TCL)

converts a date string to an integer value

execl(TCL)

replaces the current program with another, passing arguments in a list

fmtclock(TCL)

converts a time integer to readable clock format

chroot(TCL)

changes the root directory to the specified name

fork(TCL)

forks the current Tcl process

getclock(TCL)

return the current date and time as an integer

id(TCL)

gets, sets, or converts user, group, or process IDs

kill(TCL)

signals processes found in list

link(TCL)

creates hard or symbolic link between files

mkdir(TCL)

creates specified directories

nice(TCL)

changes or returns the process priority

readdir(TCL)

lists contents of a specified directory

rmdir(TCL)

removes specified directories

signal(TCL)

specifies actions to take when Tcl is signalled by the UNIX system

sleep(TCL)

sleeps for a time specified in seconds

system(TCL)

executes a command via the system(S) call

sync(TCL)

flushes all pending disk output

times(TCL)

lists process and child execution times

umask(TCL)

sets the file creation mode

unlink(TCL)

deletes (unlinks) listed files

wait(TCL)

waits for a process created by execl(TCL) to terminate