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This article is about how shell removes blank lines. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Delete blank lines

Cat a.txt | sed-e'/ ^ $/ d' (echo "abc"; echo "; echo" ddd ";) | awk'{if (0! = NF) print $0;} 'what is shell? Shell is a program written in C language that serves as a bridge for users to use Linux. Shell is both a command language and a programming language. Shell also refers to an application that provides an interface through which users access the services of the operating system kernel.

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