I have a shell script file in the rails application.Can anyone please tell me how can i call the shell script file with argument in my rails controller?
Thanks
Try backticks (``). For example a = `date` would assign shell's date command output to the a variable.
UPD: And you can obviously run something like `~/workspace/my_script.sh` to execute a script from a file, just make sure you give it executable permission first (with chmod +x ~/workspace/my_script.sh).
UPD2: And for the parameters, you can just interpolate them, like so `~/workspace/my_script.sh #{my_parameter_one}`. my_parameter_one will be available in the script as $1.
Related
I want to do the following commands in ruby.
ssh into another computer using ssh example#example
set source file source ~/.profile
cd to/some/folder
call my shell script with parameters, a json formatted string ,./my_script.sh my_hash.to_json
However I am facing these problems:
I call them in one line using backticks, it works, but it is a very bad practice in my opinion because it is not readable nor it is maintainable.
On the other hand, when I call my_hash.to_json, the resulted string has non-escaped double quotes, How do I escape them?
I would recommend to view this tutorial for ssh with ruby. then make a shell script and move it to server and then execute like a single command.
create a single shell script file for example script1 and then execute it at once instead of executing each command individually.
open file script1 using any editor.
copy all commands to script1 (each command in new line).
script1 file should look like this
#!/bin/bash
ssh example#example
source ~/.profile
cd to/some/folder
save file
make this file executable using chmod +x script
execute it in ruby like this [backtick]./script1[backtick]
note: copy script1 to usr/bin to avoid "./" and then try command only script1.
Reference for passing arguments in shell script is here.
I have application minizinc in file ~/.bashrc, and I can call it on bash. I am building a Rails application that calls minizinc from bash, but I cannot do it. After executing this:
#cmd = ` bash -c "minizinc #{path} -n 1" `
I get the following error:
bash: minizinc: command not found
How can I change the Rails application user's PATH variable from the application? Or how do I tell the Rails application where this bash application is located?
You have several options here. The one I think best suits your case and would recommend is using the command directly, instead of calling Bash to do the same as Ruby:
#cmd = `minizinc #{path} -n 1`
If you use it like this, the command is executed in a shell with an environment similar to the one where Ruby is running. Which means that the PATH variable will be the same. So if the dir containing the executable minizinc is in PATH when you start the Rails server, it should also be in the PATH variable of the shell running that command.
Now, if you really need to use Bash in the middle, I strike it as odd that the PATH variable is not the same as in Ruby (I tried it using IRB and seems to work as expected). You can check it by replacing your command with
bash -c "echo $PATH"
It should print the same value as
puts ENV['PATH']
when run in the Rails console.
If, after checking it, you see that the PATH variable of your Rails environment is incorrect, you can set it specifically for the Rails server:
PATH="<path_to_minizinc_dir>:$PATH" rails server
This sets the value of the PATH environment variable only for the command you are about to execute, in this case rails server.
Alternatively, you can surpass all this by simply using the absolute path to the executable:
#cmd = `bash -c "/full/path/to/minizinc #{path} -n 1"`
If you provide the full path to the command you want to execute, the PATH environment variable simply won't come into play, but I imagine this would be suboptimal for your case.
I am new to TCL scripting and trying to run the script from terminal.
If i run the script like
tclsh myscript.tcl
then the script is executing without any issue.
But, if I run directly without "tclsh", then it is throwing error as follows,
./myscript.tcl
./myscript: Command not found.
I have given the execution permission for that file.
I have added the tclsh path in the PATH variable
echo $PATH
/usr/local/bin:/bin:/usr/bin:/usr/bin/tclsh
Can anyone help me on this ?
Try with adding:
#!/usr/bin/tclsh
In the beginning of your script.
If still doesn't work please show us your script you're trying to run, maybe there's something wrong.
I have a command in my shell script
CONFIGS="`tar -tzf ${CONFIGS_ARCHIVE}`"
CONFIGS_ARCHIVE is tar.gz file. If the command is executed what will be the value of CONFIGS?
Thanks,
LinuxPenseur
` quote is for executing the command. Unless you put that ` quote, shell will treat that command as a regular string.
If you want to execute a command and save it to a variable like you do, you must put that ` quote
This would be part of a reverse-engineering project.
To determine and document what a shell script (ksh, bash, sh) does, it is comfortable, if you have information about what other programs/scripts it calls.
How could one automate this task? Do you know any program or framework that can parse a shell script? This way for instance, I could recognize external command calls -- a step to the right direction.
For bash/sh/ksh, I think you can easily modify their source to log what has been executed. That would be a solution.
How about:
Get a list of distinct words in that script
Search $PATH to find a hit for each
?
bash -v script.sh ?
Bash's xtrace is your friend.
You can invoke it with:
set -x at the top of your script,
by calling your script with bash -x (or even bash --debugger -x),
or recursively by doing (set -x; export SHELLOPTS; your-script; )
If you can't actually run the script, try loading it into a text editor that supports syntax highlighting for Bash. It will color-code all of the text and should help indicate what is a reserved word, variable, external command, etc.