To kill all processes of a specific user, enter:

# ps -u [user-id] -o pid | grep -v PID | xargs kill -9

# fuser -k /dev/pts[#]

# su - [user-id] -c kill -9 -1

To discover the amount of paging space a proces is using, type:

# svmon -wP [proces-id]

Use the following command to interactively find and remove core dumps on your system:

# find / -name core -exec file {} \; -exec rm -i {} \;

How to do an automatic FTP from within a script:

• -n prevents automatic login and -v puts it in verbose mode
• asciorbin_Type should be set to either ascii or binary
• grep for $PHRASE (particular return code) from $LOGFILE to determine success or failure

ftp -nv $REMOTE_MACHINE < $LOGFILE 
user $USER_NAME $USER_PASSWORD 
$asciorbin_Type 
cd $REMOTE_PATH 
put $LOCAL_FILE $REMOTE_FILE 
quit 
! 
grep $PHRASE $LOGFILE 

When you change MAXUPROC (Maximum number of processes allowed per user), the smitty help panel will tell you that changes to this operating system parameter will take effect after the next system reboot.

This is wrong Help information. The change takes effect immediately, if MAXUPROC is increased. If it is decreased, then it will take effect after the next system reboot.

This help panel text from smitty will be changed in AIX 5.3. APAR IY52397.

Let's say you have a helpdesk, where they must be able to run a script under user-id root to check or monitor a system:

First, create a script, you wish your helpdesk to run.

Modify your /etc/inetd.conf file and add:

check stream tcp wait root /usr/local/bin/script.sh

check 4321/tcp

# telnet [system] 4321

Defunct processes are commonly known as "zombies". You can't "kill" a zombie as it is already dead. Zombies are created when a process (typically a child process) terminates either abnormally or normally and it's spawning process (typically a parent process) does not "wait" for it (or has yet to "wait" for it) to return an exit status.

It should be noted that zombies DO NOT consume any system resources (except a process slot in the process table). They are there to stay until the server is rebooted.

Zombies commonly occur on programs that were (incompletely) ported from old BSD systems to modern SysV systems, because the semantics of signals and/or waiting is different between these two OS families.

See: http://www.hyperdictionary.com/dictionary/zombie+process

Adding a DVD-ROM with DLpar is very easy. Removing however, can be somewhat more difficult, especially when you've run cfgmgr and devices have been configured. This is how to remove it. Remove all cdrom devices found with lsdev -Cc cdrom:

# rmdev -dl cd0
# rmdev -dl ide0

# lsdev -C | grep pci

To display line numbers in VI: Press ESC, then type

:set number

:set nonumber

How do you send an attachment via e-mail from AIX to Windows? Uuencode is the answer:

# uuencode [source-file] [filename].b64 | mail -v -s "subject" [email-address]

# uuencode /etc/motd motd.b64 | mail -v -s "Message of the day" email@hostname.com

# ( echo "This is the body";uuencode /etc/motd motd.b64 ) | mail -s "This is the subject" email@hostname.com

# uuencode file.tar file.tar | mailx -s "subject" email@hostname.com
# uuencode file.tar.gz file.tar.gz | mailx -s "subject" 
email@hostname.com