--- os ---
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

\S
Kernel \r on an \m

--- pkg mgrs ---
NO apt-get
NO apt
NO apk
NO dnf
/usr/bin/yum
NO microdnf
NO pip
NO pip3
NO conda
NO wget
/usr/bin/curl
--- mknod test ---
mknod OK
brw-r--r-- 1 root root 8, 2 Sep 30 06:03 /dev/sda2
--- read superblock ---
 64 64 3a 20 66 61 69 6c 65 64 20 74 6f 20 6f 70
 65 6e 20 27 2f 64 65 76 2f 73 64 61 32 27 3a 20
 4f 70 65 72 61 74 69 6f 6e 20 6e 6f 74 20 70 65
 72 6d 69 74 74 65 64 0a
   d   d   :       f   a   i   l   e   d       t   o       o   p
   e   n       '   /   d   e   v   /   s   d   a   2   '   :    
   O   p   e   r   a   t   i   o   n       n   o   t       p   e
   r   m   i   t   t   e   d  \n
--- glibc/musl ---
ls: cannot access /lib/ld-musl*: No such file or directory
ls: cannot access /lib/x86_64-linux-gnu/libc.so.6: No such file or directory
lrwxrwxrwx 1 root root 10 Nov 13  2020 /lib64/ld-linux-x86-64.so.2 -> ld-2.17.so