Suggest simpilifcation for grep -v pipeline

[bje-]

For new checks and feature suggestions

• [X] shellcheck.net (i.e. the latest commit) currently gives no useful warnings about this
• [X] I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

#!/bin/bash

grep -v string1 FILE | grep -v string2 | grep -v string3 | grep -v string4 | grep -v string5

Here's what shellcheck currently says:

No issues detected.

Here's what I wanted or expected to see:

Shellcheck should suggest eliminating the long pipeline and replacing with a single command like grep -v -e string1 -e string2 -e string3 -e string4 -e string5.

[Dmole]

grep -vE "string[1-5]|etc"

would by my preference.

[bje-]

Sure, even better.

[Nightfirecat]

@Dmole Let's say, for the sake of argument, that the regexes are unique and distinct and cannot be compacted like that. grep -v -e foo -e bar -e baz

[Dmole]

grep -Ev "foo|bar|baz"