Get latest BigFix agent version dynamically (install_bigfix)

[jgstew]

References:

• http://www.gnu.org/software/grep/manual/grep.html
• https://regex101.com/
• http://support.bigfix.com/bes/release/
• http://support.bigfix.com/bes/release/index.html
• http://stackoverflow.com/questions/18072173/how-to-get-max-number-from-a-file-with-linux-bash-shell-scripts
• http://www.linuxjournal.com/article/7396
• http://www.computerhope.com/unix/usort.htm
• https://github.com/jgstew/tools/blob/master/bash/bigfix_newest_version.sh
• http://www.tldp.org/LDP/abs/html/functions.html

RegEx:
/<td align="left">(?'versions'\d+\.\d+\.\d+\.\d+)<\/td>/g

Command:
cat index.html | grep -m 16 -i -o -P -e '<td align="left">\d+\.\d+\.\d+\.\d+<\/td>' | grep -o -P -e '\d+\.\d+\.\d+\.\d+'

Extended command:
cat index.html | grep -m 16 -i -o -P -e '<td align="left">\d+\.\d+\.\d+\.\d+<\/td>' | grep -o -P -e '\d+\.\d+\.\d+\.\d+' | sort -r -V | uniq -c | grep -m 1 -i "4 " | grep -o -P -e '\d+\.\d+\.\d+\.\d+'

[jgstew]

This should get the newest version from any file more generically:
cat file.txt | grep -o -P -e '\d+\.\d+\.\d+\.\d+' | sort -r -V | grep -m 1 '.'

[jgstew]

bigfix_newest_version.sh currently only supports versions in the format 0.0.0.0 but could be adjusted to work with other formats as well.