05-28-2008
Double quotes or single quotes when using ssh?
I'm not very familiar with the ssh command. When I tried to set a variable and then echo its value on a remote machine via ssh, I found a problem. For example,
$ ITSME=itsme
$ ssh xxx.xxxx.xxx.xxx "ITSME=itsyou; echo $ITSME"
itsme
$ ssh xxx.xxxx.xxx.xxx 'ITSME=itsyou; echo $ITSME'
itsyou
$
So what was going on here? Which satement was executed on remote machine and which one was on local system? I'm a little confused ....
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LEARN ABOUT CENTOS
ssh-ldap-helper
SSH-LDAP-HELPER(8) BSD System Manager's Manual SSH-LDAP-HELPER(8)
NAME
ssh-ldap-helper -- sshd helper program for ldap support
SYNOPSIS
ssh-ldap-helper [-devw] [-f file] [-s user]
DESCRIPTION
ssh-ldap-helper is used by sshd(1) to access keys provided by an LDAP. ssh-ldap-helper is disabled by default and can only be enabled in the
sshd configuration file /etc/ssh/sshd_config by setting AuthorizedKeysCommand to ``/usr/libexec/openssh/ssh-ldap-wrapper''.
ssh-ldap-helper is not intended to be invoked by the user, but from sshd(8) via ssh-ldap-wrapper.
The options are as follows:
-d Set the debug mode; ssh-ldap-helper prints all logs to stderr instead of syslog.
-e Implies -w; ssh-ldap-helper halts if it encounters an unknown item in the ldap.conf file.
-f ssh-ldap-helper uses this file as the ldap configuration file instead of /etc/ssh/ldap.conf (default).
-s ssh-ldap-helper prints out the user's keys to stdout and exits.
-v Implies -d; increases verbosity.
-w ssh-ldap-helper writes warnings about unknown items in the ldap.conf configuration file.
SEE ALSO
sshd(8), sshd_config(5), ssh-ldap.conf(5),
HISTORY
ssh-ldap-helper first appeared in OpenSSH 5.5 + PKA-LDAP .
AUTHORS
Jan F. Chadima <jchadima@redhat.com>
BSD
April 29, 2010 BSD