What follows is some fussing with prototype functions, to show
how a 'nocomment' can harvest some stats.
The question: what's the longest config file in '/etc' that's
nothing but comments, as well as the longest file with no comments?
On 10/10/06 I'd written:
> nocomment() { grep -v -e '^#.*$\|^$' $1 ; }
>
> ...but allow for other whitespace, and take stdio.
I didn't notice, but that function also accepts standard
input. This 2nd version will remove whitespace-only lines as well as
blank lines:
nocomment() { grep -v -e '^#.*$\|^[[:space:]]*$' $1 ; }
Putting it to use. Just cut n' paste the following indented block to
an xterm...
nocomment ()
{
grep -v -e '^#.*$\|^[[:space:]]*$' $1
}
# show number of lines in a file before and after 'nocomment'
# NB: the 'grep ""' below might look useless but it catches final lines
# that have no linefeeds.
# echo -n "hello" | wc -l # one text line
# 0 # not what we want
# echo -n "hello" | grep "" | wc -l
# 1 # OK
# There must be a better way...
b4after ()
{
grep "" <$1 | wc -l;
nocomment $1 | wc -l
}
# print multiple lines on one line.
oneline ()
{
tr '\n' ' ' ;
echo
}
# show percent of a file that's comments and blanks.
showpercent ()
{
[ -f $1 -a -r $1 ] && b4after $1 | oneline | while read a b; do
[ $a = 0 ] && break;
[ $a = $b ] && c=100 || c=$(( $b * 100 / $a ));
echo $c $1;
done
}
# show top 10 files in /etc that have the least stuff...
for f in /etc/* ; do showpercent $f ; done | sort -g | head
...stop cutting here. Output from my system:
0 /etc/abcde.conf
0 /etc/bootparams
0 /etc/conf.modules.old
0 /etc/csh.logout
0 /etc/debfoster.conf
0 /etc/devscripts.conf
0 /etc/dhclient.conf
0 /etc/dnsmasq.conf.dpkg-dist
0 /etc/exports
0 /etc/gateways
...yet those aren't a true 'top ten' as we don't know which has the
most commented lines. That loop can be used in a pipe to find out:
# show my system's top ten 100% comment config files, by number of
lines.
for f in /etc/* ; do showpercent $f ; done | sort -g | grep -e '^0 .*$'
| sed 's/^0 //' | xargs wc -l | head -n -1 | sort -g | tail
49 /etc/dhclient.conf
65 /etc/login.access
71 /etc/serial.conf.dpkg-old
124 /etc/debfoster.conf
137 /etc/hdparm.conf.dpkg-dist
137 /etc/smartd.conf
356 /etc/abcde.conf
363 /etc/devscripts.conf
365 /etc/lpd.conf
415 /etc/dnsmasq.conf.dpkg-dist
The template for 'dsnmasq.conf' has the most. Now the same thing but
for files in '/etc' with neither comments or blank lines:
for f in /etc/* ; do showpercent $f ; done | sort -g | grep -e '^100
.*$' | sed 's/^100 //' | xargs wc -l | head -n -1 | sort -g | tail
43 /etc/group.OLD
49 /etc/passwd
59 /etc/group.org
64 /etc/rarfiles.lst
65 /etc/group
68 /etc/surfraw_elvi.list
113 /etc/therc
150 /etc/mime-magic.dat
271 /etc/oglerc
849 /etc/mime-magic
Most of those aren't regular config files; 'oglerc' is an .XML config.
I'm thinking the 'showpercent' function would make a useful switch for
a 'nocomment' util.
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