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@toripiyo

linux

Last updated at Posted at 2017-04-15

ssh

  • how to check ssh host key finger print
[root@localhost ssh]# ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.pub
2048 xx:xx:xx:xx:xx /etc/ssh/ssh_host_rsa_key.pub (RSA)

TCP wrapper

  • how to check tcp wrapper is used in CentOS 6
[root@localhost etc]# ldd /usr/sbin/sshd  | grep -i wrap
    libwrap.so.0 => /lib64/libwrap.so.0 (0x00007fdb92f99000)

awk

  • print "line 1" OR "column 3 has 'LINUX' strings".
awk 'NR == 1 || $3 ~ /LINUX/'
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