这里面首先是通过获取到程序的根目录，然后我这的java程序除了tomcat跑的之外，其他的java程序都是通过Main.class启动的，所以可以获取到AppName，这样通过ps命令就能找到其对应的PID了，而如果是tomcat启动的进程的话，在程序根目录下面的tomcat目录下有一个tomcat.pid文件里面有该程序的PID。后面被注释的那一端代码其实之前是加上去的，那段代码的作用是判断该进程使用的是JDK7还是JDK8启动的，当初的计划是想着如果是JDK7启动的进程就用JDK7的jstat去获取数据，如果是JDK8启动的进程就用JDK8的jstat去获取数据，后来发现不同版本的JDK获取的数据格式不同，于是。。。。。。后悔莫及的把那段代码注释掉了。后面综合公司实际情况考虑，JDK8的程序用得比较多，JDK7的程序相对来说比较少，并且慢慢都会向JDK8进行转换，所以，权衡利弊之下，之后将jstat的JDK全部换成了JDK8，这样的影响就是获取不到JDK7的永久代数据。当然，各位有兴趣的话，也可以JDK7和JDK8同时使用，在过滤输出文件的时候加一个标志位进行判断，当然，我这里暂时没有做这方面的修改。。。毕竟时间有限。。。
第四个脚本，个人感觉写的最烂的一个脚本。。。但是。。。没办法，技术水平有限，各位将就着看吧（捂脸哭）
# cat set_jvmstatus.sh
#!/bin/bash
packageName=$1
key=$2
if [ $2 == "S0C" -o $2 == "S0U" -o $2 == "S1C" -o $2 == "S1U" -o $2 == "DSS" -o $2 == "EC" -o $2 == "EU" ];then
part=gcnew
elif [ $2 == "S0" -o $2 == "S1" -o $2 == "E" -o $2 == "O" -o $2 == "M" -o $2 == "CCS" -o $2 == "YGCT" -o $2 == "FGCT" -o $2 == "GCT" ];then
part=gcutil
elif [ $2 == "S0CMX" -o $2 == "S1CMX" -o $2 == "ECMX" ];then
part=gcnewcapacity
elif [ $2 == "NGCMN" -o $2 == "NGCMX" -o $2 == "NGC" -o $2 == "OGCMX" -o $2 == "OGCMN" -o $2 == "OGC" -o $2 == "MCMN" -o $2 == "MCMX" -o $2 == "MC" -o $2 == "CCSMN" -o $2 == "CCSMX" -o $2 == "CCSC" -o $2 == "YGC" -o $2 == "FGC" ];then
part=gccapacity
elif [ $2 == "MU" -o $2 == "CCSU" -o $2 == "OC" -o $2 == "OU" ];then
part=gc
elif [ $2 == "Loaded" -o $2 == "Unloaded" ];then
part=class
elif [ $2 == "CPU" ];then
part=cpu
elif [ $2 == "MEM" ];then
part=mem
else
echo "Error input:"
exit 0
fi
case $2 in
S0C)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $1*1024}'
;;
S0U)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $3*1024}'
;;
S0)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $0}'
;;
S0CMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $4*1024}'
;;
S1C)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $2*1024}'
;;
S1U)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $4*1024}'
;;
S1)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $2}'
;;
S1CMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $6*1024}'
;;
DSS)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $7*1024}'
;;
EC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $8*1024}'
;;
EU)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $9*1024}'
;;
ECMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $8*1024}'
;;
E)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $3}'
;;
NGCMN)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $1*1024}'
;;
NGCMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $2*1024}'
;;
NGC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $3*1024}'
;;
OC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $7*1024}'
;;
OU)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $8*1024}'
;;
OGCMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $8*1024}'
;;
OGCMN)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $7*1024}'
;;
O)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $4}'
;;
OGC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $9*1024}'
;;
M)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $5}'
;;
MC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $13*1024}'
;;
MU)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $10*1024}'
;;
MCMN)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $11*1024}'
;;
MCMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $12*1024}'
;;
CCS)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $6}'
;;
CCSC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $13*1024}'
;;
CCSU)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $12*1024}'
;;
CCSMN)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $14*1024}'
;;
CCSMX)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $15*1024}'
;;
YGC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $17}'
;;
YGCT)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $8}'
;;
FGC)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $18}'
;;
FGCT)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $10}'
;;
GCT)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $11}'
;;
TT)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $5}'
;;
MTT)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $6}'
;;
Loaded)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $1}'
;;
Unloaded)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $3}'
;;
CPU)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%f\n", $1}'
;;
MEM)
grep -wA 2 ^"$part" /usr/local/etc/scripts/package/$1|tail -1|awk '{printf "%d\n", $1*1024}'
;;
*)
echo "Error input:"
;;
esac
exit 0