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The
grep -v grep
gets rid of the grep commands in the ps output that are used to search for the user and command names.

If the ps in Don's pipeline obtains the process listing after the grep processes in the pipeline have been created, the pid of grep 'CAL255.4ge, if run by wilruiz0, will be part of the result. The...

If your system has it (I believe most do), just use pkill:
pkill -9 -u wilruiz0 '^CAL255\.4ge$'

I have backslash escaped the dot so that it is no longer a wildcard, but a literal dot. Also, I...

How about using -u param of ps and here I combine two greps and awk into 1 awk script:

kill -9 `ps -fu wilruiz0 | awk '/[C]AL255.4ga/ {print $2}'`

You should try kill -15 before using -9 as...

Try:
kill -9 $(ps -aef | grep 'CAL255.4ge' | grep 'wilruiz0' | grep -v grep | awk '{print $2}')

This discussion assumes that you are using a shell that uses basic Bourne shell redirection syntax (such as bash, ksh, or sh). The csh shell and its derivatives handle redirection differently.
...

You have 4 commands that are using redirection:
nohup nice -10 programA 2>&1 > logfileA.txt
nohup nice -10 program1a 2>&1 > logfile1a.txt
nohup nice -10 program1b 2>&1 > logfile1b.txt
nohup nice...

Usually the log is merged for coherency, so stderr and stdout are logged contemporaneously in the same log, give or take some stdout buffering. Use redirection ">log_file 2>&1". You are making...