29 февр. 2012 г. · A simple solution is to use ifne command (if input not empty). In some distributions, it is not installed by default. It is a part of the ... Execute command when command-line pipe result is not null or ... Test if a command's output is an empty string and print its ... Check piped input on empty spaces and forward it Why a bash array remains empty if I pipe the result of a for loop ... Другие результаты с сайта unix.stackexchange.com

19 мар. 2017 г. · I want just a simple command like grep with some parameters to check if its input is empty and return the exit code. Preferably it should print the input if it ... How to break pipe if stdin is empty? - bash - Stack Overflow How to see if a pipe is empty - Stack Overflow Другие результаты с сайта stackoverflow.com

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. Conditional pipe in bash (custom script) - linux How to check if unnamed pipe is empty in Bash? Bash scripting: test for empty directory Другие результаты с сайта superuser.com

12 мая 2009 г. · You can test to see if a variable is specifically unset (as distinct from an empty string): if [[ -z ${variable+x} ]] where the "x" is arbitrary.

2 июн. 2010 г. · Re: Can I break a pipe if there's empty input? You could use a regular 'if statement'. It's not the most efficient, but it's simple.

23 окт. 2021 г. · To check if a string is empty in a Bash script, use the -z conditional which returns 0 (true) if the length of the string is 0 and 1 (false) ...

Оценка 5,0 (7) 29 июл. 2021 г. · Here, we have provided every detail on how to check for empty variables in a bash script, as well as introduce a handy freeware for managing Linux partitions ...

14 апр. 2023 г. · This is most likely because read receives EOF through the closed pipe as its STDIN and returns everytime the while loop iterates.

11 февр. 2013 г. · Try array=('' foo); [ -z "$array" ] && echo empty , and it will print empty even though array is clearly not empty.

12 апр. 2024 г. · This option is useful to avoid errors or unwanted actions when the input is empty. To suppress this, you can specify --no-run-if-empty option. What Are Pipes in Linux? · What Are Standard Input and...