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to avoid warning about comparison between signed and unsigned.
(list_signals): Likewise.
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Uncapitalize first word and remove period at end of each one line
option description.
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required by POSIX 1003.1-2001; when this conflicts with Bash,
stick with POSIX. The conflicts are kill -l output format,
and lower case signal names preceded by `-' (e.g., "kill -hup"
is no longer supported). Remove -L or --long-list option.
Add -t or --table option. Rename --sigspec to --signal;
remove --signum and do not advertise obsolescent option -n.
Use str2sig and str2sig to convert between signal names and
numbers.
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instead of hard-coding --help and --version descriptions.
Split --help output into smaller pieces.
Use fputs, not printf.
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