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How to assign a variable from a pipe in Bash?
In bash, what’s the most efficient way to assign a variable using piped input — using only left to right syntax? Suppose the left side of the pipe is seq 3, so we’d want: …because seq 3 is not on the left side of a pipe. For this Q, please ignore the possibility of exceeding the variable’s memory, which pipes could certainly do.
When is a shell function on the receiving end of a pipe?
To answer your actual question, when a shell function is on the receiving end of a pipe, standard input is read by the first command executed inside the function. Since printf is the first and only command in your function, standard input is ignored.
What’s the best way to run a pipe in Bash?
One solution for you would be to switch to ksh93 which is smarter about this: Another solution for bash would be to set the lastpipe shell option. This would make the last part of the pipeline run in the current environment. This however does not work in interactive shells as lastpipe requires that job control is not active.
Why do you use a temporary filename in Bash?
So why not use an external place to store the content it as a side effect (as opposed to a no-side-effect pipeline). Make sure the temporary filename is not used by other programs. Thanks for contributing an answer to Stack Overflow!
Do you use zsh for your terminal shell?
I use ZSH for my terminal shell, and whilst I’ve written several functions to automate specific tasks, I’ve never really attempted anything that requires the functionality I’m after at the moment.
Are there variable bindings in the zsh shell?
I’m slightly confused about the variable bindings/usage in ZSH; for example: correctly outputs 2011-08-23 as I’d expect. And when run with what I’d be wanting the blog title to be (ignoring the fact the string needs to be manipulated to make it more url friendly and that the route path/to doesn’t exist)
Can a variable be collected on the right hand side of a pipeline?
You can reliably use a variable collected on the right-hand side of a pipeline only if the code referencing it is also on the right-hand side of that pipeline. The POSIX sh specification neither requires nor precludes the right-hand side of a pipeline being executed in the same shell which later executes subsequent commands.
How to set a variable in cmd.exe?
Your way can’t work for two reasons. You need to use set /p text= for setting the variable with user input. The other problem is the pipe. A pipe starts two asynchronous cmd.exe instances and after finishing the job both instances are closed.
How to assign cart to variable in Bash?
Assigns cart to the variable $spa. If you just want to output the current pipe stream use cat. If you want to continue your command chain, try using the tee command to echo the output. You could use an alias to shorten the command. Here’s my solution to the problem.
How to set the output of a variable?
You can set the output to a temporary file and the read the data from the file after that you can delete the temporary file. In this variable myVarDate contains the output of command. Thanks for contributing an answer to Stack Overflow!