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 

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

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

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

# svmon -wP [proces-id]

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

Searching with grep in directories with large amounts of files, can get the following error:

The parameter list is too long

# ls | xargs grep "[search string]"

# ls | xargs grep -i "error"

The pwd command will show you default the logical directory (pwd -L = default), which means, if any symbolic links are included in the path, that is, what will be shown. To show you the actual physical directory, use the next undocumented feature:

# pwd -P

When you receive an error like:

Do not specify an existing file

# iptrace -u

Where did all these routes come from & why is my system sending ICMP packets every 10 minutes? This is caused by path MTU discovery. If your AIX system is sending ICMP packets, you can disable it:

AIX has a feature called path MTU discovery which is based on ICMP packets in order to learn MTU sizes on the LAN. Path MTU discovery is a way of finding out the maximum packet size that can be sent along a network using ICMP packets and is enabled on AIX by default. This is done to avoid IP fragmentation on heterogenous networks (ie, an ATM network connected to an ethernet network) and is described in RFC 1191.

# no -a | grep discover

# no -p -o tcp_pmtu_discover=0
# no -p -o udp_pmtu_discover=0

How do you find really large files in a file system:

# find . -size +1024 -xdev -exec ls -l {} \;

Here's how: (This has been tested this with Nmon version 9f, which you can download here):

• Run nmon -f for a while. This will create nmon output files *.nmon in your current directory.
• Make sure you've downloaded rrdtool.
• Install rrdtool by unpacking it in /usr/local/bin.
• Make sure directory /usr/local/bin is in your $PATH:

  # export PATH="$PATH:/usr/local/bin"

• Create a directory for the output of the graphs:

  # mkdir output

• Run the nmon2rrdv9 tool (found in the nmon download):

  # ./nmon2rrdv9 -f [nmon output file] -d ./output -x

• In directory output an index.html and several gif files will be created. By accessing index.html in a web browser, you can view the graphs. For a sample, click here. Tip: use nweb as your web browser.