I am trying to run this command through script doing ssh and it is only executing cd command.
cd $(ls | tail -1)
While it is working directly on the machine.
I can just assume here, but are you quoting correctly? When you run ssh user#host cd $(ls | tail -1) the command substitution is performed on the client, not the server.
You have to use:
ssh user#host 'cd $(ls | tail -1)'
That mentioned, your command doesn't do anything. cd would change the working directory on the server and then the ssh session is terminated.
Related
The following command runs well when i run it localy on the dsired machine:
app_name=*some_proccess_name*
pid=`pgrep $app_name | tail -n 1`
But when i run it in the following way, from a remote pc using ssh it dosn't work:
pid=$(ssh $USER_NAME#$HOST_NAME "echo `pgrep $app_name | tail -n 1`")
The value of pid afterwards is just blank. I am not sure what's wrong (just to clarify i have tried several processes names that are all running on the target pc- that's not the problem ).
P.S when i run the command without echo, like that, i just get stuck inside the remote pc and have to use exit in order to get unstuck and return to my local pc:
pid=$(ssh tester#mir1 "`pgrep indicator-apple | tail -n 1`")
Less is more
pid=$(ssh tester#mir1 pgrep indicator-apple \| tail -n 1)
I am attempting to run multiple commands via a bash script on a remote server. specifically, the for loop to be run on the remote server is giving me issues. I suspect it is because I don't know how to properly escape characters or use $().
Below is the code.
ssh (user)#(server) <<EOF
sudo su - (username)
whoami
'for e in $(`ls -lrt /usr/jboss/jbosseap | awk '{print $9}' | grep multichannel`);
do
echo "$e";
done'
Removing user and server names for obvious reasons. Just concentrate on the for loop. when I run that for loop command line (without the $()) its works fine. Just not sure how to nest it in a remote call.
Thanks very much for any and all help!
If you've got a complex script that you're trying to run over ssh you're going to be better off putting that script in a file and piping that file into ssh like:
cat remote_script.sh | ssh user#host
or:
cat remote_script.sh | ssh user#host sudo -u username
And now you don't have to worry about N levels of escaping.
You can run it as below .
here file "list " includes your list of nodes and script should be present in all nodes
for i in $(cat list ) ;do ssh -o StrictHostKeyChecking=no $i "/path/your_script" ;done
I have a shell script that I am using to compare directory contents. The script has to ssh to different servers to get a directory listing. When I run the script below, I am getting the contents of the server that I am logged into's /tmp directory listing and not that of the servers I am trying to ssh to. Could you please tell me what I am doing wrong?
The config file used in the script is as follows (called config.txt):
server1,server2,/tmp
The script is as follows
#!/bin/sh
CONFIGFILE="config.txt"
IFS=","
while read a b c
do
SERVER1=$a
SERVER2=$b
COMPDIR=$c
`ssh user#$SERVER1 'ls -l $COMPDIR'`| sed -n '1!p' >> server1.txt
`ssh user#$SERVER2 'ls -l $COMPDIR'`| sed -n '1!p' >> server2.txt
done < $CONFIGFILE
When I look at the outputs of server1.txt and server2.txt, they are both exactly the same - having the contents of /tmp of the server the script is running on (not server1 or 2). Doing the ssh +dir listing on command line works just fine. I am also getting the error "Pseudo-terminal will not be allocated because stdin is not a terminal". Adding the -t -t to the ssh command isnt helping either
Thank you
I have the back ticks in order to execute the command.
Backticks are not needed to execute a command - they are used to expand the standard output of the command into the command line. Certainly you don't want the output of your ssh commands to be interpreted as commands. Thus, it should work fine without the backticks:
ssh user#$SERVER1 "ls -l $COMPDIR" | sed -n '1!p' >>server1.txt
ssh user#$SERVER2 "ls -l $COMPDIR" | sed -n '1!p' >>server2.txt
(provided that double quotes to allow expansion of $COMPDIR are used).
first you need to generate keys to login to remote without keys
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
then try to ssh without pass
ssh remote-host
then try to invoke in your script but first make sanity check
var1=$(ssh remote-host) die "Cannot connect to remote host" unless $var1;
This question already has answers here:
Shell Script error: "head: invalid trailing option -- 1"
(3 answers)
Closed 8 years ago.
I am trying to recover the content of the last created file on a remote server.
When connected to the remote server I do this:
cat `ls -t /mypath/*.csv | head -1`
CMD="cat `ls -t /mypath/*.txt | head -1`"
But when I try to use the same command:
ssh#XX.XX.XX.XX $CMD
I get an error: ls cannot access /mypath/*.csv No such file or directory.
The ` is forcing to execute the ls on the local system on not the remote.
Is there another way?
Thank you
Your command is failing is because the backticks in $CMD are expanded locally when you create the variable, rather than being expanded on the remote side. So ssh#XX.XX.XX.XX $CMD is actually going to look something like ssh#XX.XX.XX.XX "cat /mypath/local_file" (and local_file may not exists on the remote host, and is probably not the file you want).
You can prevent this local expansion by providing the command directly to ssh.
ssh user#host 'cat /mypath/$(ls -t /mypath/*.txt | head -1)'
ls returns the pathname relative to the directory so you will also need to include the path of the base directory /mypath/ in your cat invocation. To avoid this hardcoding pass the -d flag to ls.
ssh user#host 'cat $(ls -dt /mypath/*.txt | head -1)'
Hi i am trying to execute the following command on a remote machine how do i do this
ssh login.com find /nfs/repo/ -name ".user_repo.log" | \
xargs cat | awk '{$NF=""; print $0}' | \
sed "1i Owner RepoName CreatedDate" | column -t
I get the following error message
cat: /nfs/repo/new1/info/.user_repo.log: No such file or directory
cat: /nfs/repo/new2/info/.user_repo.log: No such file or directory
cat command is trying to find file on the local system while these files are present on the remote machine.How do i handle this
If you do:
ssh host command1 | command2
Then the shell will break at the pipe, so you'll get "ssh host command1" run as one command (i.e. remotely), and then "command2" run as another command (i.e., locally.) You can force all the commands to run remotely by enclosing in quotes:
ssh host "command1 | command2"
Note, since you already have quotes in the command, you might have to get creative with escaping.
Or, you might put all those commands in a short shell script and then just run the script:
ssh host myscript.sh