Shell-script - Parse passwd file and get ser input, Scripting to parse user input

Parse passwd file and get ser input

shell script to parse /etc/passwd file and place it as input

How to find a user is present or not

# grep -i 'avahi' /etc/passwd 

avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin  

The above command will grep for the user avahi and will grep the lines present in the server or /etc/passd file.

Cut command to parse the file and make it as a input

# grep -i 'avahi' /etc/passwd | cut -d: -f 1,3,5,6 

avahi-autoipd:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd
avahi:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon

The above command will cut the username, User-id or UID, User Comment and the users home directory

Translate the required field to into columns

# grep -i 'avahi' /etc/passwd | cut -d: -f 1,3,5,6 | tr ':' '\t' 

avahi-autoipd	170	Avahi IPv4LL Stack	/var/lib/avahi-autoipd
avahi	70	Avahi mDNS/DNS-SD Stack	/var/run/avahi-daemon

The above command will translate the ":" into tab separated column. which will easy to use as user input using awk command.

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