If you do not specify posname, ar inserts file at the beginning of the archive. This option is the same as -b . Normally, the case is significant. Puts any temporary files that ar generates in the current directory rather than the default temporary file directory. Regenerates the symbol table regardless of whether the command modifies the archive.
Most file systems truncate the file name to the appropriate length.
Replaces the member only if the modification time of the file member is more recent than the time of the archive member. Prints its version number on standard error. Gives verbose output. With -p , it displays the member name before the contents. Only the last component will be used when comparing against the names of files in the archive.