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Q. How do I kill a process called inetd or foo and restart the same so that configuration file get updated?

A. Both UNIX and Linux supports POSIX reliable signals and POSIX real-time signals. Each signal has a current disposition, which determines how the process behaves when it is delivered the signal.

Generally following command is used
kill -1 process-pid

First get pid of inetd:
ps -e | grep inetd
Now force read inetd.conf:
kill -1 xinetd-pid

You can also use pkill command used to send signals. The pkill command allows the use of extended regular expression patterns and other matching criteria.
pkill -HUP process-name

Make syslog reread its configuration file
# pkill -HUP syslogd

Make xinetd reread its configuration file
# pkill -HUP inetd

Understanding command line shell

Q. I’ve migrated from Windows NT to Linux workstation. Most documents refer to a command line shell. Can you explain me command line shell?

A. A shell allows you to type the commands such as date or clear. There are many shell available. BASH (bourne again shell) is default shell for most Linux distributions.

It also known as a command interpreter which takes command from user and pass the same to kernel for execution. Bash shell supports aliases, filename completion, command history, POSIX compatibility and many other features.

Other UNIX / Linux shell

  • csh / tcsh
  • sh / ksh

Where is my GNU C compiler? Where does the GNU C (gcc) compiler reside in the RHEL / Fedora / Debian / Ubuntu / CentOS Linux installation? How do I install GNU c/c++ compiler in Linux operating systems?
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