Today I Learned

hashrocket A Hashrocket project

Bird Beak Bash (or process substitution)

Process substitution feeds the output of a process (or processes) into the stdin of another process.

<() creates a file descriptor and is most useful when using a command that takes two files as arguments like diff or comm but you want to use output from commands rather than files.

comm <(ls dirA) <(ls dirB)
See More #command-line TILs