character (`)
A backquote or backtick.
echo 'date'
date
echo `date`
2015年 07月 03日 星期五 16:11:13 CST
jstat -gc `ps aux | grep java | awk '/broker/ {print $2}'`
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT
2048.0 2048.0 313.3 0.0 16384.0 8391.0 61440.0 22971.5 17280.0 16807.5 1920.0 1785.5 1354 7.391 0 0.000 7.391