root@BJ-CentOS7 ~ # rpm -aq | grep ssh
rpm: error while loading shared libraries: libplds4.so: cannot open shared object file: No such file or directory
root@BJ-CentOS7 ~ # find / -name libplds4.so
/usr/lib64/libplds4.so (这里)
查看 /lib64 目录是 /usr/lib64 的链接目录(文件权限第一位为 l 代表该文件/目录是链接文件/目录)
使用 strace 命令追踪系统命令执行调用的系统文件路径(参数 -e open 用于观察目前进程正引用哪些文件)
root@BJ-CentOS7 ~ # strace -e open rpm -qa | grep ssh
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/librpm.so.3", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/librpmio.so.3", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdb-5.3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libbz2.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libelf.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/liblua-5.1.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libnss3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpopt.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libnssutil3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libplc4.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libplds4.so", O_RDONLY|O_CLOEXEC) = 3 libplds4.so文件的绝对路径获取到了
open("/lib64/libnspr4.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/librt.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/proc/filesystems", O_RDONLY) = 3
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/rpm/rpmpopt-4.11.3", O_RDONLY) = 3
... ...