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Syntax:

$ awk -F 'FS' 'commands' inputfilename

or

$ awk 'BEGIN{FS="FS";}'

$ cat etc_passwd.awk
BEGIN{
FS=":";
print "Name\tUserID\tGroupID\tHomeDirectory";
}
{
    print $1"\t"$3"\t"$4"\t"$6;
}
END {
    print NR,"Records Processed";
}

$ awk -f etc_passwd.awk /etc/passwd
Name    UserID  GroupID        HomeDirectory
gnats    41    41    /var/lib/gnats
libuuid    100    101    /var/lib/libuuid
syslog    101    102    /home/syslog
hplip    103    7    /var/run/hplip
avahi    105    111    /var/run/avahi-daemon
saned    110    116    /home/saned
pulse    111    117    /var/run/pulse
gdm    112    119    /var/lib/gdm
8 Records Processed

$ awk -F':' '{print $3,$4;}' /etc/passwd
41 41
100 101
101 102
103 7
105 111
110 116
111 117
112 119

$ awk -F':' 'BEGIN{OFS="=";} {print $3,$4;}' /etc/passwd
41=41
100=101
101=102
103=7
105=111
110=116
111=117
112=11

$ cat student.txt
Jones
2143
78
84
77

Gondrol
2321
56
58
45

RinRao
2122
38
37
65

Edwin
2537
78
67
45

Dayan
2415
30
47
20

$ cat student.awk
BEGIN {
    RS="\n\n";
    FS="\n";
}
{
    print $1,$2;
}
$ awk -f student.awk  student.txt
Jones 2143
Gondrol 2321
RinRao 2122
Edwin 2537
Dayan 2415