cloud engineer
Here’s how to display asterisks when typing passwords in Bash.
#!/bin/bash unset password prompt="Enter Password:" while IFS= read -p "$prompt" -r -s -n 1 char do if [[ $char == $'\0' ]] then break fi prompt='*' password+="$char" done echo echo "Done. Password=$password" |
#!/bin/bash unset password prompt="Enter Password:" while IFS= read -p "$prompt" -r -s -n 1 char do if [[ $char == $'\0' ]] then break fi prompt='*' password+="$char" done echo echo "Done. Password=$password"
Here’s how to display GCP VM labels.
Display all labels.
gcloud compute instances describe VM --zone ZONE --project PROJECT_ID --format="value(labels)" |
gcloud compute instances describe VM --zone ZONE --project PROJECT_ID --format="value(labels)"
Display a specific label.
gcloud compute instances describe VM --zone ZONE --project PROJECT_ID --format="value(labels.key)" |
gcloud compute instances describe VM --zone ZONE --project PROJECT_ID --format="value(labels.key)"
This will display only lines 40-50 in a file called lines.txt.
$ cat lines.txt | head -n 50 | tail -n 10 |
$ cat lines.txt | head -n 50 | tail -n 10
For lines 90-100.
$ cat lines.txt | head -n 100 | tail -n 10 |
$ cat lines.txt | head -n 100 | tail -n 10
and so on.