Question

The following code works to get the status value of a if its enabled, d if its disabled and n if its not present from a file given below:

# Check whether the service entry exists and whether it is enabled or disabled
# Status value 'a' states that the service is uncommented in /etc/inetd.conf.
# Value 'd' states that the service is commented, and value 'n' specifies
# that the service entry doesnt exist in the configuration file.
status=`awk -v serv=$1 -v proto=$2 -v exist="n" '
        BEGIN {
        format=sprintf("^[\t ]*%s.*%s",serv,proto);
        comformat=sprintf("^[\t ]*#[\t ]*%s.*%s",serv,proto);
        }
        {
        if(match($0,format))
        {
                exist="a";
        }
        else if(match($0,comformat))
        {
                exist="d";
        }
        }
        END {
        printf("%s",exist)
        }' $INETD`

From the following file:

ftp     stream  tcp6    nowait  root    /usr/sbin/ftpd         ftpd
telnet  stream  tcp6    nowait  root    /usr/sbin/telnetd      telnetd -a
shell   stream  tcp6    nowait  root    /usr/sbin/rshd         rshd
#kshell  stream  tcp     nowait  root    /usr/sbin/krshd        krshd
login   stream  tcp6    nowait  root    /usr/sbin/rlogind      rlogind
#klogin  stream  tcp     nowait  root    /usr/sbin/krlogind     krlogind

Note: $1 = column 1 in the file and $2 = column 3 in file.

So my concern is if the above searching using the following format good enough? or is there anyother better regular expression:

 format=sprintf("^[\t ]*%s.*%s",serv,proto);
 comformat=sprintf("^[\t ]*#[\t ]*%s.*%s",serv,proto);

Answer 1

Based on what I have understood of the problem this might work –

status=$(awk -v serv="$1" -v proto="$2" '
$1==serv && $3==proto {val="a";exit}
$1=="#"serv && $3==proto {val="d";exit}
END{if ((val=="a") || (val=="d")) print val; else print "n"}' $INETD)

Test: Based on passing the values manually and using the below content in file

[jaypal:~/Temp] cat f1
ftp     stream  tcp6    nowait  root    /usr/sbin/ftpd         ftpd
telnet  stream  tcp6    nowait  root    /usr/sbin/telnetd      telnetd -a
shell   stream  tcp6    nowait  root    /usr/sbin/rshd         rshd
#kshell  stream  tcp     nowait  root    /usr/sbin/krshd        krshd
login   stream  tcp6    nowait  root    /usr/sbin/rlogind      rlogind
#klogin  stream  tcp     nowait  root    /usr/sbin/krlogind     krlogind

[jaypal:~/Temp] awk -v serv="kshell" -v proto="tcp" ' # kshell exists but is commented
$1==serv && $3==proto {val="a";exit}
$1=="#"serv && $3==proto {val="d";exit}
END{if ((val=="a") || (val=="d")) print val; else print "n"}' f1
d
[jaypal:~/Temp] awk -v serv="ftp" -v proto="tcp6" ' # tcp6 proto exits
$1==serv && $3==proto {val="a";exit}
$1=="#"serv && $3==proto {val="d";exit}
END{if ((val=="a") || (val=="d")) print val; else print "n"}' f1
a
[jaypal:~/Temp] awk -v serv="ftp" -v proto="tcp" ' # tcp proto does not exist
$1==serv && $3==proto {val="a";exit}
$1=="#"serv && $3==proto {val="d";exit}
END{if ((val=="a") || (val=="d")) print val; else print "n"}' f1
n