以mv命令为例
1、查看命令所在位置
[root@VM_0_11_centos ~]# which mv
alias mv='mv -i'
/usr/bin/mv
2、查看该命令所属rpm包
[root@VM_0_11_centos ~]# rpm -qif /usr/bin/mv
Name : coreutils
Version : 8.22
Release : 24.el7
Architecture: x86_64
Install Date: Sun 08 Dec 2019 08:30:47 AM MST
Group : System Environment/Base
Size : 14593469
License : GPLv3+
Signature : RSA/SHA256, Thu 22 Aug 2019 03:21:30 PM MDT, Key ID 24c6a8a7f4a80eb5
Source RPM : coreutils-8.22-24.el7.src.rpm
Build Date : Tue 20 Aug 2019 12:27:26 AM MDT
Build Host : x86-01.bsys.centos.org
Relocations : (not relocatable)
Packager : CentOS BuildSystem <http://bugs.centos.org>
Vendor : CentOS
URL : http://www.gnu.org/software/coreutils/
Summary : A set of basic GNU tools commonly used in shell scripts
Description :
These are the GNU core utilities. This package is the combination of
the old GNU fileutils, sh-utils, and textutils packages.
3、下载该rpm包
[root@VM_0_11_centos yum.repos.d]# yumdownloader --source coreutils
Loaded plugins: fastestmirror, langpacks
Enabling updates-source repository
Enabling base-source repository
Enabling extras-source repository
Enabling docker-ce-stable-source repository
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* elrepo: mirrors.tuna.tsinghua.edu.cn
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base-source | 2.9 kB 00:00:01
base-source/7/primary_db | 1.1 MB 00:02:44
coreutils-8.22-24.el7.src.rpm 35% [=================- ] 9.2 kB/s | 1.9 MB 00:06:20 ETA
如果下载失败，可以更换yum源，参考链接https://www.jianshu.com/p/df6241d7548c
4、利用rpm2cpio命令提取源代码
[root@VM_0_11_centos coreutils]# rpm2cpio coreutils-8.22-24.el7.src.rpm | cpio -id
11392 blocks
[root@VM_0_11_centos coreutils]# ll
total 11208
-rw-rw-r-- 1 root root 868 Feb 14 05:46 coreutils-4.5.3-langinfo.patch
-rw-rw-r-- 1 root root 5427 Feb 14 05:46 coreutils-6.10-configuration.patch
-rw-rw-r-- 1 root root 576 Feb 14 05:46 coreutils-6.10-manpages.patch
-rw-rw-r-- 1 root root 617 Feb 14 05:46 coreutils-7.4-sttytcsadrain.patch
-rw-r--r-- 1 root root 5531411 Feb 14 05:44 coreutils-8.22-24.el7.src.rpm
-rw-rw-r-- 1 root root 3758 Feb 14 05:46 coreutils-8.22-cp-selinux.patch
-rw-rw-r-- 1 root root 11416 Feb 14 05:46 coreutils-8.22-cp-sparsecorrupt.patch
-rw-rw-r-- 1 root root 1633 Feb 14 05:46 coreutils-8.22-date-emptyTZ.patch
-rw-rw-r-- 1 root root 823 Feb 14 05:46 coreutils-8.22-date-example-typo.patch
-rw-rw-r-- 1 root root 16663 Feb 14 05:46 coreutils-8.22-dd-progress.patch
-rw-rw-r-- 1 root root 1575 Feb 14 05:46 coreutils-8.22-df-autofs.patch
-rw-rw-r-- 1 root root 37683 Feb 14 05:46 coreutils-8.22-df-bind-mount.patch
-rw-rw-r-- 1 root root 1757 Feb 14 05:46 coreutils-8.22-df-dummy-local.patch
-rw-rw-r-- 1 root root 18860 Feb 14 05:46 coreutils-8.22-df-filtermountlistupdate.patch
-rw-rw-r-- 1 root root 3651 Feb 14 05:46 coreutils-8.22-df-getdisk.patch
-rw-rw-r-- 1 root root 1390 Feb 14 05:46 coreutils-8.22-df-stat.patch
-rw-rw-r-- 1 root root 1295 Feb 14 05:46 coreutils-8.22-doc-ls-kibibytes.patch
-rw-rw-r-- 1 root root 5801 Feb 14 05:46 coreutils-8.22-du-bindmountcycles.patch
-rw-rw-r-- 1 root root 1363 Feb 14 05:46 coreutils-8.22-failingtests.patch
-rw-rw-r-- 1 root root 1477 Feb 14 05:46 coreutils-8.22-id-groups.patch
-rw-rw-r-- 1 root root 6854 Feb 14 05:46 coreutils-8.22-ls-interruption.patch
-rw-rw-r-- 1 root root 14467 Feb 14 05:46 coreutils-8.22-mv-hardlinksrace.patch
-rw-rw-r-- 1 root root 37417 Feb 14 05:46 coreutils-8.22-mv-n-noreplace.patch
-rw-rw-r-- 1 root root 13185 Feb 14 05:46 coreutils-8.22-newfilesystems.patch
-rw-rw-r-- 1 root root 10225 Feb 14 05:46 coreutils-8.22-non-defaulttests.patch
-rw-rw-r-- 1 root root 1895 Feb 14 05:46 coreutils-8.22-ppc64le.patch
-rw-rw-r-- 1 root root 4559 Feb 14 05:46 coreutils-8.22-selinux-optionsseparate.patch
-rw-rw-r-- 1 root root 1145 Feb 14 05:46 coreutils-8.22-sort-blanks.patch
-rw-rw-r-- 1 root root 5335124 Feb 14 05:46 coreutils-8.22.tar.xz
5、解压文件
[root@VM_0_11_centos coreutils]# xz -d coreutils-8.22.tar.xz
[root@VM_0_11_centos coreutils]# tar -xf coreutils-8.22.tar
[root@VM_0_11_centos coreutils]# cd coreutils-8.22/
[root@VM_0_11_centos coreutils-8.22]# cd src
[root@VM_0_11_centos src]# ll
total 2808
-rw-rw-r-- 1 root root 8640 Dec 4 2013 base64.c
-rw-rw-r-- 1 root root 4919 Dec 4 2013 basename.c
-rw-rw-r-- 1 root root 5290 Dec 4 2013 c99-to-c89.diff
-rw-rw-r-- 1 root root 22725 Dec 4 2013 cat.c
-rw-rw-r-- 1 root root 16355 Dec 4 2013 chcon.c
-rw-rw-r-- 1 root root 8836 Dec 4 2013 chgrp.c
-rw-rw-r-- 1 root root 15845 Dec 4 2013 chmod.c
-rw-rw-r-- 1 root root 10116 Dec 4 2013 chown.c
-rw-rw-r-- 1 root root 17246 Dec 4 2013 chown-core.c
-rw-rw-r-- 1 root root 2281 Dec 4 2013 chown-core.h
-rw-rw-r-- 1 root root 6821 Dec 4 2013 chroot.c
-rw-rw-r-- 1 root root 9879 Dec 4 2013 cksum.c
-rw-rw-r-- 1 root root 12863 Dec 4 2013 comm.c
-rw-rw-r-- 1 root root 102362 Dec 4 2013 copy.c
-rw-rw-r-- 1 root root 10637 Dec 4 2013 copy.h
6、查看源码
[root@VM_0_11_centos src]# cat mv.c
/* mv -- move or rename files
Copyright (C) 1986-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Mike Parker, David MacKenzie, and Jim Meyering */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <assert.h>
#include <selinux/selinux.h>
来源：CSDN
作者：远去的栀子花
链接：https://blog.csdn.net/u012967763/article/details/104318564