Command-Line Options

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-aAll (without argument). If there is a GNU-style --all option, for -a to be anything but a synonym for it would be quite surprising. Examples: fuser(1), fetchmail(1).Append, as in tar(1). This is often paired with -d for delete.-bBuffer or block size (with argument). Set a critical buffer size, or (in a program having to do with archiving or managing storage media) set a block size. Examples: du(1), df(1), tar(1).Batch. If the program is naturally interactive, -b may be used to suppress prompts or set other options appropriate to accepting input from a file rather than a human operator. Example: flex(1).-cCommand (with argument). If the program is an interpreter that normally takes commands from standard input, it is expected that the option of a -c argument will be passed to it as a single line of input. This convention is particularly strong for shells and shell-like interpreters. Examples: sh(1), ash(1), bsh(1), ksh(1), python(1). Compare -e below.Check (without argument). Check t…