Thanks again for your reply.
So lets take an example /usr/bin/grep. In that case I get: 
rpm -qf --queryformat "[%{NAME}]" /usr/bin/grep
grep

[download]
After that, you suggested to run: 
rpm -q --requires grep
info
/bin/sh
/bin/sh
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libc.so.6()(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
rpmlib(PayloadIsLzma) <= 4.4.6-1

[download]
How to handle this output? Which lines interest me? I guess to run rpm -q --requires info and get: 
bash
zlib
libzio
/bin/sh
/bin/sh
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libbz2.so.1()(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libncurses.so.5()(64bit)
libz.so.1()(64bit)
libzio.so.0()(64bit)
rpmlib(PayloadIsLzma) <= 4.4.2-1

[download]
What should I do with other lines?

In reply to Re^6: Capture::Tiny getting stuck on ldd /proc/self/fd/1 by ovedpo15
in thread Capture::Tiny getting stuck on ldd /proc/self/fd/1 by ovedpo15

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