How do I redirect command output to a variable in Bash?
How do I redirect command output to a variable in Bash?
You can’t redirect command output to a variable in bash; however you can assign the output of a command to a variable using command substitution num=$ (find -name “$name” | wc -l) Note that counting lines of output from find is not a robust way to evaluate the number of matching files.
Is there a way to redirect errors to a sub-shell?
The shell recognizes this and doesn’t have to run ‘cat’ to get the data. The bigger question is hard. I don’t think there’s an easy way to do it. You’d have to build the entire pipeline into the sub-shell, eventually sending its final standard output to a file, so that you can redirect the errors to standard output.
Do I need a semi-colon in Bash?
Note that the semi-colon is needed (in classic shells – Bourne, Korn – for sure; probably in Bash too). The ‘{}’ does I/O redirection over the enclosed commands. As written, it would capture errors from sedtoo. WARNING:Formally untested code – use at own risk.
What is line redirection in shell script?
This type of redirection instructs the shell to read input from the current source until a line containing only word (with no trailing blanks) is seen. All of the lines read up to that point are then used as the standard input (or file descriptor n if n is specified) for a command.
What is redirection command in Linux?
Redirection allows commands’ file handles to be duplicated, opened, closed, made to refer to different files, and can change the files the command reads from and writes to. Redirection may also be used to modify file handles in the current shell execution environment.
Why does redirectredirect only redirect to stdout?
Redirects only STDOUT, because the file descriptor 2 is redirected to the file pointed to by file descriptor 1 (which is not the file file yet when the statement is evaluated). Each command in a pipeline has its own STDERR (and STDOUT) because each is a new process.
