A shell variable is a variable that is available only to the current shell. In contrast, an environment variable is available system wide and can be used by other applications on the system.A shell is the operating system's command interpreter. It processes the commands entered on the command line or read from a shell script file.
BPO categories are front office customer services (such as tech support) and back office business functions (such as billing).
The following are BPO advantages:
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