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 echo stdin, unless empty, in which case cat a file Другие результаты с сайта superuser.com

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 How can I use else for `ifne`? - Unix & Linux Stack Exchange 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 check if pipe content (stdout) is empty in bash [duplicate] Другие результаты с сайта stackoverflow.com

23 янв. 2018 г. · I want it to execute only if $(ps aux | grep '[p]ostgres'|awk '{print $2}') is non-empty, otherwise it will throw me error like this.

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) ...

2 июн. 2010 г. · I want to process logfiles (msmtp and procmail for what it's worth, with grep and mailstat) and have the results in my mailbox. Of course only if there are any.

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

I am using solutions from Test if a command outputs an empty string. In addition to those solutions, I want to print command's output if its 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...

How do I check to make sure a file is not zero bytes? ... The test command is your best bet. Look at the bottom -z is for zero test and -n is for non-zero test.