29 февр. 2012 г. · I have piped a line in bash script and want to check if the pipe has data, before feeding it to a program. Searching I found about test -t 0 but ...

5 июл. 2021 г. · The answer to the question in the title, to "check if output is non-empty, and print it if it is", is to just print it unconditionally.

17 мая 2011 г. · (Solution: How to check if pipe is empty) You might run into the same issue if the file begins with a byte that is not a valid character in the ...

7 июл. 2017 г. · How to check if a pipe is empty and run a command on the data if it isn't? 2 · Output of command when piped to another command · 2 · How can I ...

20 янв. 2023 г. · If your tail is that smart and if you're sure the stdout is a pipe then run tail -f /dev/null in your script. The command will exit immediately ...

19 авг. 2024 г. · If you cat myFifo in one terminal, and ls > myFifo in a different terminal, you will see that readers wait for something to be written.

28 нояб. 2018 г. · The -t test is true if the fd is open and associated with a terminal. If its false, either its closed or not associated with a terminal.

2 июл. 2012 г. · You can test if the input of a command is empty with ifne from moreutils or other methods. But since you're piping into awk, you might as well ...

3 февр. 2020 г. · A straight forward approach I can think of is to use a temporary storage for output. It can be done with minimal modification of your code like this:

28 мая 2021 г. · You can check the type, attributes and value of $PIPESTATUS with typeset -p PIPESTATUS . Then $PIPESTATUS stays scalar and is not automatically ...