Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In addition to Chris Jester-Young good answerI would say that xargs is also a good solution for these situations:. For completeness, I'll also mention command substitution and explain why this is not recommended:. This will fail if the output from grep produces a file name which contains whitespace or a shell metacharacter.
Of course, it's fine to use this if you know exactly which file names the grep can produce, and have verified that none of them are problematic. But for a production script, don't use this. Anyway, for the OP's scenario, where you need to refer to each match individually and add an extension to it, the xargs or while read alternatives are superior anyway.
In the worst case meaning problematic or unspecified file namespass the matches to a subshell via xargs :. In the ideal case, the command you want to run is simple or versatile enough that you can simply pass it an arbitrarily long list of file names.
For example, GNU cp has a -t option to facilitate this use of xargs the -t option allows you to put the destination directory first on the command line, so you can put as many files as you like at the end of the command :.
Unfortunately, this doesn't match the OP's scenario; if you need to rename every file while copying, you need to pass in just two arguments per cp invocation: the source file name and the destination file name to copy it to. Remove echo if you're satisfied with the output. For a recursive solution take a look at the bash shell option globstar. Learn more. How to pass command output as multiple arguments to another command Ask Question.
Asked 4 years, 5 months ago. Active 3 months ago. Viewed 6k times. I want to pass each output from a command as multiple argument to a second command, e. Use command xargs. I guess you mean grep -l See also bash pwd and open with pipe not working which has a very detailed explanation.
Active Oldest Votes. Chris Jester-Young Chris Jester-Young k 41 41 gold badges silver badges bronze badges.
In addition to Chris Jester-Young good answerI would say that xargs is also a good solution for these situations: grep For example, GNU cp has a -t option to facilitate this use of xargs the -t option allows you to put the destination directory first on the command line, so you can put as many files as you like at the end of the command : grep -l "pattern" input xargs cp -t destdir which will expand into cp -t destdir file1 file2 file3 file Jetchisel Jetchisel 1, 1 1 gold badge 7 7 silver badges 7 7 bronze badges.
Sign up or log in Sign up using Google.Passing multiple arguments
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.If we need to make our script dynamic we generally use arguments.
Arguments are provided to the script through the command line. In this tutorial, we will examine different use cases of argument passing and examples.
In order to use externally provided values inside the bash script, we should provide them after the script name. Following syntax assumes the script is executable.
We have learned the syntax of the arguments. In this example, we will look use cases about argument passing.
How to Pass Command Line Arguments in Shell Script
We will provide two arguments for example. If we need to provide a string with multiple words we can use single or double-quotes. Now the real work starts now. We have learned how to provide arguments from the shell or command line. In this part, we will look at how to read them inside the script.
We can use the if statement to check specific input like below. Below we will check the positional parameter 1 and if it contains some value the value will be printed to the screen. Another use case for bash variables is assigning them new variables with meaningful names. This will give us the ability to change provided values and use them properly with their names. Some times some arguments will not fit our condition and we may need a lot of arguments to provide and use them in an iterative way.
In this example, we will iterate over provided arguments and print them to the shell. As regular Linux applications, we can use parameter names for arguments and parse them accordingly. We will use getops function which will parse provided options in an array. Bash provides different functions to make reading bash input parameters.
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I have, however, created a workaround using a shell function after googling a little like below:. Just wanted to know if there is a way to make aliases that accept CL parameters. BTW - I use 'bash' as my default shell.
You found the way: create a function instead of an alias. The C shell has a mechanism for doing arguments to aliases, but bash and the Korn shell don't, because the function mechanism is more flexible and offers the same capability. Just to reiterate what has been posted for other shells, in Bash the following works:. There is no mechanism for using arguments in the replacement text. The easiest way, is to use function not alias.
Here in alias which takes arguments. You actually can't do what you want with Bash aliases, since aliases are static. Instead, use the function you have created. Yes I know it's mactips. And be aware of fact that aliases defined in a script are not visible in that script because aliases are expanded when a script is loaded, not when a line is interpreted.
The default character is a space. Another note is the use of a list of logs, how often does that change? My assumption is daily. Why not use the directory output as the array of your iterative loop?
How To Pass and Parse Linux Bash Script Arguments and Parameters
For example. While these are merely suggestions to improve your shell scripting knowledge I must know if there is an error you are getting and would also need to know the details of each scripts code and or functionality. Making the use of the -x argument helps debug scripting as well.
If you are simply transferring logs you may wish to do away with the scripts all together and make use of rsyncrsyslog or syslog as they all are much more suited for the task in question. In this example, xargs will execute. The standard input comes from the file list. This assumes that the list. Invoke utility using as many standard input arguments as possible, up to number a positive decimal integer arguments maximum.
Another solution would be to allow the script to read directly from list. But since we don't know what the mechanics of the script is, I can't make any detailed explanation of how to go about doing this.
Note: I personally think Kusalananda's approach is the best in this specific scenario, so I'll just add some explanatory information and recommendations. Unquoted variables are probably the main source of bugs and security holes in shell scripts. You could also modify your script to support multiple arguments and even a --batch option.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.A Command-line Arguments are passed after the name of a program in command-line operating systems like DOS or Linux and are passed into the program from the operating system. Shell scripts also accept command line arguments similar to nix commands.
Command line arguments are useful for passing input to script at runtime which has its own advantage. This article will help you to pass command line arguments in a shell script. To pass a command line argument we can simply write them after script name separated with space. A sample example of passing command line argument to shell script.
Create a shell script to Print all Argument with script name and total number of arguments passed. Create loop through all arguments in shell script. To do this create a shell script file myScript2. We can also access all command line arguments by shifting their position in a shell script. Now shift arguments with 1. It means the second argument is now at first position, similarity third is at second and so on. Create a shell script myScript3. I hope this will help you for understanding command line arguments in a shell script.
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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Let's say I have defined a function abc that will handle the logic related to analyzing the arguments passed to my script. How can I pass all arguments my bash script has received to it? The number of params is variable, so I can't just hardcode the arguments passed like this:.
Better yet, is there any way for my function to have access to the script arguments' variables? Here is an example. This works for multiple arguments. When the expansion occurs within double quotes, each parameter expands to a separate word. So this function implements a sorted diff by passing the first two arguments to diff through sort and then passing all other arguments to diff, so you can call it similarly to diff:. But I was trying to pass a parameter through to an su command, and no amount of quoting could stop the error su: unrecognized option '--myoption'.
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am writing a very simple script that calls another script, and I need to propagate the parameters from my current script to the script I am executing. From Bash by example.
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For example. Works fine, except if you have spaces or escaped characters. I don't find the way to capture arguments in this case and send to a ssh inside of script. One closely related use case is passing all given arguments inside an argument like this:. Learn more. Propagate all arguments in a bash shell script Ask Question.
Asked 9 years, 2 months ago. Active 12 days ago. Viewed k times. For instance, my script name is foo. Fragsworth Fragsworth Related: How to pass all arguments passed to my bash script to a function of mine? See also stackoverflow. Active Oldest Votes. Andrew Marshall What about passing flags? Eg, '. I suggest anyone who wants to understand the subject of Word Splitting better, to read more about it here. I suggest you show what happens when including an 'arg with spaces' for the three examples, too.
I was surprised by the results; hopefully you can explain them. MichaelScheper, anyhow. For bash and other Bourne-like shells: java com.
Chris Johnsen Chris Johnsen k 24 24 gold badges silver badges bronze badges. Amir: No, not for csh. As desired, this passes the same set of arguments received by the script -- not one big argument. The double-quotes are necessary.
Works even if with quoted arguments that include spaces. Related: if your shell script is just acting as a wrapper to run java, consider making the last line exec java com. So, you are using one less process slot. Also, if the parent process which ran your script is watching it via the pid, and expecting it to be the 'java' process, some unusual things could break if you don't do an exec; the exec causes java to inherit the same pid.