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Is there way to use sed to change only one occurence in a colon separated line?

I would like to change a file from

*:*:rex:rex
*:*:simon:rex

to

*:*:rex:mabry
*:*:simon:rex

Thank you both!!!!!

I cannot seem to get the following script to work. I cannot seem to set the variable. What am I missing?

bin/bash
set -x

echo "2" > /tmp/number

STATUS='grep -c 2 /temp/number'

if [...

Thanks for trying to help. But the echo "2" didn't work either. However, the way you cleaned it up is awesome.

We approaching it differently. The .bash_profile script gives the option to set...

I am trying to write a one line command for Oracle grid control. I am using a semi-colon to separate the commands. But, I am having a problem with a shell script accepting input. Wondering if you...