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Basically you have three types of memory in an AIX system: "used" and "unused" and the "used" category divides into two parts: "computational" and "file" memory.

"unused" is memory the kernel has...

Note that using:
find /path/to/files -type f -newermt 2017-01-01 \! -newermt 2018-01-01 -exec rm -fv \{\} \;
will invoke the rm utility once for each of the 200K files you want to remove. That is...

In a professional environment with traditional application you often want (or are asked) to report the users.
Traditionally there is the who command
who | awk '{print $1}'telnetd or sshd register...

In principle: yes. You can change this behavior to some extent by setting kernel tuning parameters but for most purposes the default behavior does quite OK so that this is not necessary. Here, for...

i work with AIX, therefore my clients are always big companies (mostly banks) with big datacentres. I have none of these fancy certifications*) but i have a project record going back more than 30...

Well, you do, if you want to compare it more than once, since $? is overwritten every time you execute a program or statement.

This is an ideal place to use a case statement though:

case "$?"...

Likewise, you could try this modification of drysdalk's suggestion:
ssh <hostname> || date
Which would only print the date if ssh ends with an error condition.

An alternative to remove an if ... then .... else ... fi section:-while true
do
if [[ -s file.txt ]]; then
### here im mailing content of file.txt
abend=1...

ld or ldd? I think ldd might be more useful to list expected shared library versions.

Use grep -f: instead of writing a shell loop grep can do it in one step (and presumably quite faster):

grep -f new_phone master > in_new_phone_and_master

You might want to try this with some...

@drysdalk

Your solution is functional but can I make a few suggestions to help improve it.

file_string=`/bin/cat date.txt | /usr/bin/awk '{print $5,$4,$7,$6,$8}'`

1. Awk can open an read...

Note that several short cuts can be used to speed up the above script and reduce chances for failures due to system limits on the size of argument lists allowed when execing a file...

The command:...

Interesting suggestion. awk is a lot more functional than cut fyi, you can replace all the kitchen | sink | commands with one awk. zcat file.gz | awk '{ gsub(/[\(\)]/, ""); print $2 ; exit }'