bash snipts

bash_snipts.sh

#####  get current directory in absolute path

# Add `> /dev/null 2>&1` to eliminate outputs of `cd` in some cases

base_dir="$( cd "$(dirname $0)" > /dev/null 2>&1 && pwd)"

# other options

current_dir=$(pwd)   # current working directory
base_dir=$(dirname $0)   # in relative path
abs_dir=$(readlink -f $0)   # follow link


#####  check java version

# When used with [[, the ‘<’ and ‘>’ operators sort lexicographically using the current locale.

java_ver=$( "$JAVA_HOME/bin/java" -version 2>&1 | awk -F '"' '{print $2}' )
echo java version $java_ver

if [[ "$java_ver" > "1.8" ]]; then
    echo 1.8 or above
else
    echo less than 1.8
fi