Single quotes are also a good way to delay $ expansion. In fact, using single quotes a lot and first prevents lots of surprises. In severe cases of quote and $ confusion, you can go to:
How would I combine something like:
localserver# ssh remoteserver
remoteserver# find blah blah blah
into a one liner that would ssh to the remote server and run the find command, so I could put it in a script to automatically go out and run things on remote servers with out needed user... (2 Replies)
how to run a command in different machie
in my case script will runs in solaries machine..
in one instance it has to run a command in different machine with different operating system ( linux ) using SSH command
i tried
ssh -l (login_name) (machine name/host ) " command "
but it is... (3 Replies)
when i run a command on ALOM via ssh i get following error
ssh root@10.23.12.51 showhosts
Password:
Waiting for daemons to initialize...
Daemons ready
shell: Invalid credentials
how can i run commands without actually loging to the sc (3 Replies)
Hi All,
Noob question here...
How do I kill the 3rd command in this ssh chain effectively?
# ssh -t -t 10.80.0.5 'ssh 10.80.0.6 | /var/tmp/some_script'
The "/var/tmp/some_script" contains: ssh 10.80.0.81 'echo "Hello World!!!!" >> /tmp/sample.txt'The problem is that once the sample.txt... (2 Replies)
Hi all,
When I put the Perl command in a script, I got error.
system("perl -pi -e 's@words@words@g' myFile");
The error is:
Unrecognized character \x8A; marked by <-- HERE after دت مد�<-- HERE near column 15 at -e line 1.
Thanks in advance.
---------- Post updated at 06:30 AM... (0 Replies)
Greetings,
I have an issue that has baffled me. I have done many searches, read the man documentation, and I have yet to find a solution. I am trying to run the following command within a script to copy a file across servers:
$(dd if="$FDIR" bs=1024 2> /dev/null | ssh "$(whoami)@$SERVER"... (5 Replies)
Hello,
I am trying to create a ksh script to login to server and collect gather output of some command to troubleshoot some issue.
DATE=`date +%b.%d.%Y.%M.%H`
echo " Enter emp id to login to server"
read Eid
Eid=$Eid
echo " Enter hostname of the system"
read HOST
HOST=$HOST... (2 Replies)
I have a script that reads a file containing a list of server names. It's suppose to loop through the list of names and execute a command on the remote server using ssh. It processes the ssh command for the first server in the list and then exits. Here's the code:
#!/bin/bash
... (2 Replies)
I am trying to run an awk command inside of ssh and it is not working. These are AIX servers.
for i in `cat servers`; do ssh $i "/bin/hostname; df -g | awk '/dev/ && $4+0 > 70'"; done
server1
server2
server3
server4
I also tried these two methods and they did not work. It just seemed... (5 Replies)
Discussion started by: cokedude
5 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.16.3 2010-06-11 SHELL-QUOTE(1)