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Full Discussion: Why do I need this in the script tutorial?
Top Forums Shell Programming and Scripting Why do I need this in the script tutorial? Post 302529935 by MaindotC on Saturday 11th of June 2011 12:02:09 PM
Old 06-11-2011
Why do I need this in the script tutorial?
I'm taking a tutorial - intro to Unix Shell Scripting - and the first exercise is a walk-through of writing a script to achieve the following:

"As a network administrator you are collecting configuration information about all FTP servers in the organisation. You need to write a script to collect information about:
- The FTP server that is running.
- The configuration file and its location on the FTP server.
- Permission information of the configuration file.
- Useful content of the configuration file."

I'm sure this is probably a naive script that would make some of you gosu's vomit but just go along with it for now please. SO anyway, it has me enter the following commands to start the script:

Code:
#!/bin/bash
clear
ps ax | grep -v grep | grep ftpd 1> /dev/null || echo "NO FTP service running"
#### end of snippet #####

Now obviously when I finish the script the tutorial prints the desired output. However I don't understand why there are so many greps in this command. For example, I ran the same command on a Ubuntu vm:
Code:
dvorjak@dvorjak:~$ ps ax | grep -v grep | grep ftpd
968 ?         Ss                0:00 /usr/sbin/vsftpd
dvorjak@dvorjak:~$ ps ax | grep -v grep | grep ftpd 1> /dev/null || echo "NO FTP service running"
dvorjak@dvorjak:~$

Why do I need so many greps in that command? Again - I realise this is some tutorial that is presenting this script, not you, but can you guess why they would require this? Just fyi - here's the whole script:
Code:
]#!/bin/bash
clear
ps ax | grep -v grep | grep ftpd 1> /dev/null || echo "NO FTP service running"
CONFIG_FILE=$(ps ax | grep -v grep | grep ftpd | awk '{print $6}')
echo "FTP configuration file on `hostname` is"
basename $CONFIG_FILE
echo "It is located in the directory"
dirname $CONFIG_FILE
echo ________________Detailed information about the file_______________
ls -l $CONFIG_FILE
echo
echo
echo "_______________Non-commented lines in the ${CONFIG_FILE}__________"
cat $CONFIG_FILE | grep -v ^#

 

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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