am trying to delete a user named vivek using the userdel command as follows
userdel -r vivek
userdel: user vivek is currently used by process 749
How do I fix this problem and delete username vivek on a Debian Linux 9.x server?
want to find out how many times a word (say foo or an IP address) occurs in a text file using the grep command
on Linux or Unix-like system?
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