不需要反引号的运行ssh复杂远程命令方式
不需要反引号的运行ssh复杂远程命令方式
之前当我需要执行复杂的运程命令时，总是要先处理好引号、变量等问题，之后再执行命令写起来太麻烦，今天在commandlinefu上学了一招非常棒的方法，记录一下。
举个例子，之前需要用\反引$符号
[root@localhost ~]# ssh 127.0.0.1 -l root "echo a b c | awk '{print \$2}'"
b
现在我们可以把复杂的命令写到文件中执行。
[root@localhost ~]# cat cmd
echo a b c | awk '{print $2}'
方法1:
[root@localhost ~]# ssh 127.0.0.1 -l root "$(
方法2:
[root@localhost ~]# ssh 127.0.0.1 -l root "cat cmd"
b
方法3，使用标准输入执行，输入完毕后使用ctrl-D提交命令:
[root@localhost ~]# ssh 127.0.0.1 -l root "cat -"
hostname
if [ -d /root/ ];then
echo "ok"
else
echo "not ok"
fi
ctrl-D
localhost
ok
[root@localhost ~]#
直接把script嵌入到脚本中
[root@localhost ~]# ssh 127.0.0.1 -l root "$(cat
ssh host -l user $(
run complex remote shell cmds over ssh, without escaping quotes
Much simpler method. More portable version:
ssh host -l user "cat cmd.txt"
perl -e 'system @ARGV, ' ssh host -l user
run complex remote shell cmds over ssh, without escaping quotes
I was tired of the endless quoting, unquoting, re-quoting, and escaping characters that left me with working, but barely comprehensible shell one-liners. It can be really frustrating, especially if the local and remote shells differ and have their own escaping and quoting rules. I decided to try a different approach and ended up with this.
so we need to save the command in cmd.txt first and then run it?
there’s no way to do this? :
ssh host -l user $(perl -ane "print $F[1]\n" filename )
one alternative I can think of (not to save a file and then use "cat cmd.txt") is;
ssh host -l user "cat -"
And then type your command, press Enter and then ctrl-D. This will allow you run complex commands on remote machine without saving a file..