Key Terms and Concepts

/proc filesystem

argc

argv

chdir system call

chmod system call

cmdline file

command-line values

cpu file

creation mask

cwd pointer

effective group ID (EGID)

effective user ID (EUID)

environ

environ command

environ file

environment variable

fchdir system call

fchmod system call

fd subdirectory

file descriptor table

file permissions

getcwd library function

getenv library function

getgrgid system call

getopt library function

getpgid system call

getpid system call

getppid system call

getpwuid system call

getrlimit system call

init process

inode

lstat system call

maps file

process group

process group ID (GID)

process ID (PID)

process leader

procinfo command

putenv library function

readlink system call

real group ID (GID)

real user ID (UID)

root pointer

session

set-group-ID (SGID)

setpgid system call

setrlimit system call

set-user-ID (SUID)

signal

stat file

stat system call

statm file

status file

sysconf library function

system file table

system inode table

ulimit command

ulimit system call

umask command

umask system call