How do I redirect output to a variable in shell?

How do I redirect output to a variable in shell?

The command outputs the modified content and would commonly be redirected into a file or piped to another command. (E.g. sed, awk, perl, etc.) Putting the read and the mystic_command into a “sub shell” via parenthesis is not necessary but makes it flow like a continuous pipe as if the 2 commands where in a separate script file.

How to redirect Bash command into a subshell?

But in bash, for that to work, you’d need to set the lastpipe option ( shopt -s lastpipe, only works for non-interactive shell instances), for that last pipe component not to be run in a subshell. If you’re going to display the contents of the variable, remember the syntax is: not echo $variable.

Do you have to use another line in Bash?

Another pitfall with this is that command substitution — $ () — strips trailing newlines. Probably not always important, but if you really want to preserve exactly what was output, you’ll have to use another line and some quoting:

How does multiple line output work in Bash?

Thus (1) preserves the shape of the input variable, whereas (2) creates a potentially very long single line of output with ‘words’ separated by single spaces (where a ‘word’ is a sequence of non-whitespace characters; there needn’t be any alphanumerics in any of the words).

How to redirect errors to standard output in Bash?

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. Note that the semi-colon is needed (in classic shells – Bourne, Korn – for sure; probably in Bash too).

How to redirect error stream to output stream?

You can redirect the error and warning stream to the output stream separately so instead of doing this If you want to say capture the output stream into a variable and capture other streams into a different variable then you can do this using sub expressions: Thanks for contributing an answer to Stack Overflow!

Is it safe to use local variables in Bash?

This routine can be rewritten for non- bash as well such that there is no need for local -n. However then you cannot use local variables and it gets extremely ugly! Also note that the eval s are used in a safe fashion. Usually eval is considerered dangerous.

How to redirect ex command output into current?

Otherwise (if you just do append (‘.’,var)) you end up with ^@’s (nulls) instead of newlines, since that’s what vimscript uses to represent newlines in String variables. edit: as @Bill Odom mentions, using :put =variable_you_redirected_to is a lot easier than the complicated append () expression. Thanks, Bill!

How to redirect the output of a function in Vim?

It declares a function Redir (command, target) and a command R. The command parses the last series of non-space characters as a redirection target and passes that to the function, which does the boilerplate to redirect the command output to the redirection target. The command is everything after R and before the last space.

How does redirmessages ( msgcmd, destcmd ) work in Java?

RedirMessages (msgcmd, destcmd) ” ” Captures the output generated by executing a:msgcmd, then places this ” output in the current buffer. ” ” If the a:destcmd parameter is not empty, a:destcmd is executed ” before the output is put into the buffer.