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a34ee4f35f
The commands under "bin/" output the error messages by themselves by setting opterr to 0, and are compatible with getopt_long, but if an invalid long option is specified, the option that causes the error will not be displayed as shown below: lscp: invalid option -- Also lscp and lssu do not properly display error messages for options that require an additional argument and it is not provided. Fix these issues by not setting opterr to 0 and leaving error output for argument options to getopt() or getopt_long()'s built-in features. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>