refer: print usage to stderrmaster
commit0cc4ee1f7206ea0b9218d2ce798ea50344b537f4
authoraabacchus <bvnfuller@gmail.com>
Sun, 22 May 2022 21:53:08 +0000 (22 22:53 +0100)
committerAli Gholami Rudi <ali@rudi.ir>
Fri, 27 May 2022 10:31:48 +0000 (27 15:01 +0430)
tree02610059b1cf0c4d3ff81ec494c937b71c4caae7
parentb11d03d051f79791d03d6d3c1c9f492c1fa1f512
refer: print usage to stderr

so that if an incorrect option is given in a pipeline, the error message can be seen.
refer.c