[英]ssh and environment variables remote and local
I need to use a remote variable and a local variable in the same remote ssh command 我需要在同一个远程ssh命令中使用远程变量和局部变量
export CASSANDRA_DIR=/opt/cassandra
ssh root@sdi-prod-02 <<\EOF
export READ=$(grep IPADDR /etc/sysconfig/network-scripts/ifcfg-eth0 |awk -F= '{print $2}')
echo "listen_address: $READ" to directory "$CASSANDRA_DIR"
EOF
The $READ variable is working just fine while the CASSANDRA_DIR is not working. $ SC变量工作得很好,而CASSANDRA_DIR不工作。 The following does work for CASSANDRA_DIR
以下适用于CASSANDRA_DIR
ssh root@sdi-prod-02 echo "directory=$CASSANDRA_DIR"
thanks, Dean 谢谢,迪恩
What should be expanded locally, keep the sigil $
as is, like $foobar
什么应该在本地扩展,保持sigil
$
原样,像$foobar
What you want to be expanded remotely, you may use backslashes : \\$foobar
你想远程扩展什么,你可以使用反斜杠:
\\$foobar
By default in here-docs , the variable are expanded. 默认情况下, here-docs会扩展变量。
Ex. 防爆。 :
:
cat<< EOF
$UID
EOF
To avoid expanding in here-doc , you can use this form : 为避免在here-doc中扩展,您可以使用以下格式:
cat<< 'EOF'
$variable_that_will_not_been_expanded
EOF
or yours : 或者你的:
cat<< \EOF
$variable_that_will_not_been_expanded
EOF
both works. 两者都有效。
If you didn't want to use a here-doc you can do it this way: 如果您不想使用here-doc,可以这样做:
export CASSANDRA_DIR=/opt/cassandra
ssh root@sdi-prod-02 "
export READ=\$(grep IPADDR /etc/sysconfig/network-scripts/ifcfg-eth0 |awk -F= \'{print \$2}\')
echo \"listen_address: \$READ\" to directory \"$CASSANDRA_DIR\"
"
My final result is thus which works great (notice I cahnge \\EOF to EOF instead!!!!! and then escape the remote variables 因此,我的最终结果非常有效(请注意我将EOF改为EOF而不是!!!!!然后转义远程变量
export CASSANDRA_DIR=/opt/cassandra
ssh root@sdi-prod-02 <<EOF
export READ=$(grep IPADDR /etc/sysconfig/network-scripts/ifcfg-eth0 |awk -F= '{print $2}')
echo "listen_address: \$READ to directory $CASSANDRA_DIR"
EOF
IT all works great in that READ is generated remotely and CASSANDRA_DIR is the var on my original machine. 一切都很好,因为READ是远程生成的,而CASSANDRA_DIR是我原始机器上的var。
Dean 院长
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