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I want to change my username how can I

I need help writing a script that will reformat a crontab file. The first thing the script is doing is a crontab -l > crontab.txt. I need the crontab.txt file to read "8.00 PM every weekday...

How do I get rid of null characters/strings in a unix text file. I need to use this in a script. When I use dev/null it puts null characters in my file and makes it larger. Please help

I need a unix script that will check the size of multiple files in the same directory or from a text file.

Thanks I will try that

I am trying to delete all the lines out a file from a unix script. Please help
Platform is Sun