12 нояб. 2010 г. · The following ifnotempty function pipes its input to the command passed as an argument, except that it does nothing if the input is empty.

27 апр. 2011 г. · Use read -t 0 -N 0 to detect if data is available on stdin . Use test -t 0 or tty to try to detect if a pipe is connected to stdin .

13 июл. 2020 г. · All components of a pipeline start simultaneously – the second command always will be started no matter what happens in the first command.

2 июн. 2016 г. · Is there any built-in way in bash to pipe output further if certain test condition is met? Essentially I want to know if I have to write following function ...

31 окт. 2011 г. · If there is no file in dir/, then test -e dir/* is called. If the only file is '*' in dir then test will return 0. If there are more files, then it returns 2.

27 сент. 2018 г. · My script attempts to gather information that may or may not be present in STDIN at execution time, but cat hangs if the pipe is empty.

20 февр. 2013 г. · You can fix a broken pipe at the expense of another process by inserting tail -n +1 in your pipe, like this: type rvm | tail -n +1 | head -1

17 мая 2012 г. · You can't get output into a variable and PIPESTATUS returned without either a temporary file for the former, or marshalling the latter into a string.

16 сент. 2010 г. · A pipe will connect standard output of one process to standard input of another. So ls | echo Connects standard output of ls to standard input of echo.

14 авг. 2018 г. · In Bash, you can use shopt -s lastpipe to do the same, but it only works when job control is disabled, so not in interactive shells by default.