One-liner: check file growth in real time

Not quite a one-liner, but it can be copy&pasted in a terminal window ;)

bash
TIME=10
FILE=file.log
function fsize {
	SIZE=`ls -l $FILE | awk '{print $5}'`
}
fsize
S1=$SIZE
while true
do
	sleep $TIME
	fsize
	S2=$SIZE
	(( DIFF=($S2-$S1)/$TIME ))
	echo "($S2-$S1)/$TIME = $DIFF"
	S1=$S2
done

The script above will check the “file.log” size every 10 seconds and output the previous size, the new size and bytes per second:

(30117062-30085517)/10 = 3154
(30148404-30117062)/10 = 3134
(30179199-30148404)/10 = 3079
^C
^D

Python on Solaris: Wrong ELF class: ELFCLASS64

If “pip” installed 64-bit libraries, while python is a 32-bit binary, “pkg” might stop working with the following error messages:

ImportError: ld.so.1: bootadm: fatal: /usr/lib/python2.7/site-packages/lxml/etree.so: wrong ELF class: ELFCLASS64
ImportError: ld.so.1: python2.7: fatal: /usr/lib/python2.7/site-packages/_cffi_backend.so: wrong ELF class: ELFCLASS64
$ file `which python`
/usr/bin/python:	ELF 32-bit LSB executable 80386 Version 1 [SSE], dynamically linked, not stripped

The workaround is to remove the corresponding python packages (in this case cffi and lxml), download and recompile them manually with “-m32”:

$ export CFLAGS="-m32"

One-liner: generate group-urls for all remote-access tunnel-groups (Cisco ASA)

This one-liner takes Cisco ASA config, checks for “tunnel-group … remote-access” and generates the following two lines:

tunnel-group GROUPNAME webvpn-attributes
 group-url https://CISCO_ASA_FW_FQDN/GROUPNAME enable
for i in `fgrep tunnel-group CISCO_ASA.conf | fgrep remote-access | awk '{print $2}'`
do
echo "tunnel-group $i webvpn-attributes"
echo " group-url https://CISCO_ASA_FW_FQDN/$i enable"
done

One-liner: get image URLs from Google Image search

Let’s search for “red apple”:

For Solaris (use gsed instead of sed):

curl -A "Mozilla/5.0 (X11; SunOS i86pc; rv:52.0) Gecko/20100101 Firefox/52.0" \
'https://www.google.nl/search?q=red+apple&tbm=isch' 2>/dev/null | \ 
tail -1 | gsed -e 's/,"ow":/*/g' -e 's/,"ou":/*Image:/g' | \ 
tr '*' '\n' | grep "^Image" | sed -e 's/^Image:"//' -e 's/"$//' 

For Linux:

curl -A "Mozilla/5.0 (X11; SunOS i86pc; rv:52.0) Gecko/20100101 Firefox/52.0" \
'https://www.google.nl/search?q=red+apple&tbm=isch' 2>/dev/null | \ 
tail -1 | sed -e 's/,"ow":/*/g' -e 's/,"ou":/*Image:/g' | \ 
tr '*' '\n' | grep "^Image" | sed -e 's/^Image:"//' -e 's/"$//' 

One-liner: how to check the SSL certificate expiration of several servers

for i in cnn.com bbc.co.uk
do
  exp=`echo | openssl s_client -connect $i:443  2>/dev/null | 
  openssl x509 -noout -dates | fgrep notAfter | sed -e 's/^.*=//'`
  echo "$i        $exp"
done

cnn.com	    Feb  6 12:00:00 2018 GMT
bbc.co.uk   Apr 20 10:01:10 2017 GMT

One-liner: how to count the total amount of specific lines in several files

egrep -c extended */*.conf | 
awk 'BEGIN {FS=":"; sum=0;}{sum +=$2} END {print sum}'  

BTW, using awk alone is slower:

time awk 'BEGIN {sum=0;}/extended/{sum++} END {print sum}' */*.conf
110653

real	0m0.94s
user	0m0.91s
sys	0m0.01s

time egrep -c extended */*.conf | 
awk 'BEGIN {FS=":"; sum=0;}{sum +=$2} END {print sum}'
110653

real	0m0.13s
user	0m0.10s
sys	0m0.02s

fgrep is slower than egrep:

time fgrep -c extended */*.conf | 
awk 'BEGIN {FS=":"; sum=0;}{sum +=$2} END {print sum}'
110653

real	0m0.21s
user	0m0.17s
sys	0m0.03s