# grep

* grep for $string1 AND $string2:

```
grep -RiE 'rabbit.*guest' /etc/*
```

* diff files and show only common lines:

```
grep -F -x -f file1 file2
```

* find all files containing a string and run sed command against them:

```
files=$(git grep -l "kind: HelmRelease" | grep -v gotk) && echo $files | xargs sed -i 's/v2beta1/v2beta2/g'
```