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bash script

Bash Script Flags

Can you explain me common UNIX / Linux / Mac OS X / BSD bash shell script flags?
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Bash Append Text To a Variable

How do I append additional text a variable? For e.g., I've a vech set as follows:
I'd like to add (append) "Bus" word to $vevh under UNIX scripting using bash?
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Linux Bash Script Check File Existence

How do I check if a file called /tmp/foo.txt exists or not using a shell script under Linux operating systems?
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Bash Script Replace Empty Spaces String

How do I remove all spaces from string using shell scripts? I've var="This is a test", and I'd like to remove all spaces.
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