Bash - How to pass arguments to a script that is read via redirected standard input

Question

I would like to expand a little more on "Bash - How to pass arguments to a script that is read via standard input" post.

I would like to create a script that takes standard input and runs it remotely while passing arguments to it.

Simplified contents of the script that I'm building:

ssh server_name bash <&0

How do I take the following method of accepting arguments and apply it to my script?

cat script.sh | bash /dev/stdin arguments

Maybe I am doing this incorrectly, please provide alternate solutions as well.

The command-line args are insufficient for this application? — Brian Cain
– Brian Cain, Commented Dec 16, 2011 at 1:25
How do I supply command line arguments to ssh server_name bash <&0 , so that they are not interpreted as bash options? — dabest1
– dabest1, Commented Dec 16, 2011 at 1:27

ccarton · Accepted Answer · 2011-12-16 14:29:59Z

19

Try this:

cat script.sh | ssh some_server bash -s - <arguments>

answered Dec 16, 2011 at 14:29

ccarton

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Brian Cain · Accepted Answer · 2011-12-16 01:36:13Z

2

ssh shouldn't make a difference:

$ cat do_x 
#!/bin/sh

arg1=$1
arg2=$2
all_cmdline=$*
read arg2_from_stdin

echo "arg1: ${arg1}"
echo "arg2: ${arg2}"
echo "all_cmdline: ${all_cmdline}"
echo "arg2_from_stdin: ${arg2_from_stdin}"

$ echo 'a b c' > some_file
$ ./do_x 1 2 3 4 5 < some_file 
arg1: 1
arg2: 2
all_cmdline: 1 2 3 4 5
arg2_from_stdin: a b c
$ ssh some-server do_x 1 2 3 4 5 < some_file
arg1: 1
arg2: 2
all_cmdline: 1 2 3 4 5
arg2_from_stdin: a b c

answered Dec 16, 2011 at 1:36

Brian Cain

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6 Comments

dabest1 Over a year ago

Sorry, this is not what I meant. Taking from your example ssh some-server do_x 1 2 3 4 5 < some_file, replace do_x by standard input: bash <&0 , and this line would be inside do_x script. So now, how would I pass the arguments?

Brian Cain Over a year ago

I don't understand. Are you trying to write your own shell in do_x?

dabest1 Over a year ago

I am trying to create a wrapper script that runs remotely any script provided. Also I would like to support any piped input.

Brian Cain Over a year ago

instead of wrapping, why not just source in the features which should be common among scripts?

shellter Over a year ago

may not be an answer that OP wants, but good stuff!, thanks for sharing @BrianCain . Good luck to all.

|

user82216 · Accepted Answer · 2017-12-23 01:26:29Z

0

This variant on ccarton's answer also seems to work well:

ssh some_server bash -s - < script.sh <arguments>

answered Dec 23, 2017 at 1:26

user82216

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