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Linux in a Nutshell, 6th Edition by Robert Love, Stephen Figgins, Ellen Siever, Arnold Robbins

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Synopsis

. file [arguments]

Read and execute lines in file. file does not have to be executable, but must reside in a directory searched by PATH. The arguments are stored in the positional parameters. If Bash is not in POSIX mode and file is not found in PATH, Bash looks in the current directory for the file.

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