Merge pull request #50078 from php-coder/fix_useless_cat_usage

Automatic merge from submit-queue Simplify a command for unmounting mounted directories **What this PR does / why we need it**: This PR simplifies a command for unmounting mounted directories. It replaces `cat | awk | grep` by a single `awk` expression. **Special notes for your reviewer**: Link about useless cat/grep usage: http://porkmail.org/era/unix/award.html#grep **Credit**: I saw this code fragment in the Julia Evans (@jvns) [write up](https://jvns.ca/blog/2017/07/30/a-couple-useful-ideas-from-google/). **Release note**: ```release-note NONE ``` CC @simo5

Merge pull request #50078 from php-coder/fix_useless_cat_usage
f37b3065 · Kubernetes Submit Queue · GitHub · 6cbfac2c · ae99f10a · f37b3065
Commit f37b3065 authored Aug 11, 2017 by Kubernetes Submit Queue Committed by GitHub Aug 11, 2017
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reset.go cmd/kubeadm/app/cmd/reset.go +1 -1

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--- a/cmd/kubeadm/app/cmd/reset.go
+++ b/cmd/kubeadm/app/cmd/reset.go
@@ -97,7 +97,7 @@ func (r *Reset) Run(out io.Writer) error {

 	// Try to unmount mounted directories under /var/lib/kubelet in order to be able to remove the /var/lib/kubelet directory later
 	fmt.Printf("[reset] Unmounting mounted directories in %q\n", "/var/lib/kubelet")
-	umountDirsCmd := "cat /proc/mounts | awk '{print $2}' | grep '/var/lib/kubelet' | xargs -r umount"
+	umountDirsCmd := "awk '$2 ~ path {print $2}' path=/var/lib/kubelet /proc/mounts | xargs -r umount"
 	umountOutputBytes, err := exec.Command("sh", "-c", umountDirsCmd).Output()
 	if err != nil {
 		fmt.Printf("[reset] Failed to unmount mounted directories in /var/lib/kubelet: %s\n", string(umountOutputBytes))