Scenario

You are on a machine that does not have tr . You want to use tr to quickly edit a file ./my-article.md and delete all "s. You cannot install anything but you can do it with the pre-installed docker

Solution

docker run \ # start docker
--rm \ # remove container after you finish edit
-i \ # this is IMPORTANT, to allow stdin piped into docker instance
jare/alpine-vim \ # specify image
tr -d '"' \ # specify command
< ./my-article.md \ # pipe the file into docker program, which is tr in this case
> ./my-article-quotes-removed.md \ # save output to a file in the machine!