Unix Calls Flashcards
ps -ef
Lists running processes
e (every process)
f (full output)
fork
Creates new process that is clone of the parent process, returns pid of child
execve
Executes program
function > file
> is redirection of a command’s output to a file
who
List of users currently logged on
cat
Concatenates to single output
exit
Normal process termination, exits current process
kill
Kills processes that do not catch the signal
init
First process started on boot, creates other processes (this is a daemon)
grep
Prints all lines with the following expression in them
thread_create
Library procedure that creates new thread
thread_exit
Library procedure that causes thread to vanish such that it cannot be scheduled
thread_wait
Library procedure that blocks the calling thread until a specific thread has exited
thread_yield
Allows thread to voluntarily give up CPU time to another thread (there is no clock interrupt for threads, as there is for processes)
select
Allows caller to tell if it will read or block
access
System call to determine if access to file is available
nice
change priority
size
find out about size requirement
exec
throws away current address space, replaces with current program
wait
wait until child process exits, return PID of child and exit code
stat
STATS AND SHIT
chmod
change mode: rwx = 4,2,1
user (u), group (g), other (o), all (a)
eg. chmod u-r file.extension
or chmod a+rx file.extension
lai
..
ln
…27m link
ls -l (ln?)
number between permissions and owner is link count
ln -s
j
man
files
pipe
creates pipe and returns 2 file descriptors: one for reading and one for writing
curl
transfer data to/from server using supported protocol
ping
test this
trace
test this
dig
..
traceroute
…
