一些方便系统诊断的bash函数

原文地址：一些方便系统诊断的bash函数

 一些方便系统诊断的bash函数：http://hongjiang.info/common-bash-functions/
  这段脚本包含100多个bash函数，是我几年前方便自己调试和诊断问题写的。贴出来给有需要的人，因为比较懒怎么使用这些函数就不写说明了。其中以下划线开头的是表示私有函数，以cf_开头的表示公共函数，可当做命令使用。
 # check current os is linux
 function cf_is_linux() {
   [[ "$OSTYPE" = *linux* ]] && echo "true" && return
   echo "false" && return
 }

 # check current os is mac/darwin
 function cf_is_darwin() {
   [[ "$OSTYPE" = *darwin* ]] && echo "true" && return
   echo "false" && return
 }

 # check current os is windows/cygwin
 function cf_is_cygwin() {
   [[ "$OSTYPE" = *cygwin* ]] && echo "true" && return
   echo "false" && return
 }

 function cf_is_gnu_date() {
   date --version >/dev/null >& && echo "true" && return
   echo "false" && return
 }

 function cf_is_gnu_sed() {
   sed --version >/dev/null >& && echo "true" && return
   echo "false" && return
 }

 function cf_is_gnu_awk() {
   awk --version | grep GNU >/dev/null && echo "true" && return
   echo "false" && return
 }

 function cf_is_gnu_grep() {
   grep --version | grep GNU >/dev/null && echo "true" && return
   echo "false" && return
 }

 # java style startsWith
 function cf_starts_with() {
   local str=$
   local pre=$
   [[ "$str" ==  ${pre}* ]]
 }

 # java style substring
 function cf_substring() {
   local str=$
   local begin=$
   local end=$
   if [ -z "$end" ]; then
     echo ${str:$begin}
   else
     local len=`expr $end - $begin`
     echo ${str:$begin:$len}
   fi
 }

 # get current shell name
 function cf_shell_name() {
   local name=$( ps -ocommand= -p $$ | awk '{print $1}')
   if cf_starts_with $name "-"; then
     cf_substring $name
   else
     echo $name
   fi
 }

 # check current shell is bash
 function cf_is_bash() {
   [[ `cf_shell_name` = "-bash" || `basename $(cf_shell_name)` = "bash" ]] && echo "true" && return
   echo "false" && return
 }

 # check current shell is zsh
 function cf_is_zsh() {
   [[ `cf_shell_name` = "-zsh" || `basename $(cf_shell_name)` = "zsh" ]] && echo "true" && return
   echo "false" && return
 }

 function _script_dir() {
   if cf_is_bash >/dev/null; then
     cd "$( dirname "${BASH_SOURCE[]}" )" && pwd -P
   elif cf_is_zsh >/dev/null; then
     cd "$( dirname "${(%):-%N}" )" && pwd -P
   else
     echo "unsupported shell" && return
   fi
 }

 function _script_file() {
   if cf_is_bash >/dev/null; then
     basename "${BASH_SOURCE[0]}"
   elif cf_is_zsh >/dev/null; then
     basename "${(%):-%N}"
   else
     echo "unsupported shell" && return
   fi
 }

 # colorful grep. private function
 function _get_colorful_grep() {
   cf_is_gnu_grep >/dev/null && echo "grep --color" && return
   export GREP_OPTIONS='--color=always'
   export GREP_COLOR='1;35;40'
   echo "grep"
 }

 # list all common functions
 function cf_functions() {
   if cf_is_bash >/dev/null; then
     declare -F | awk '{print $NF}' | grep "cf_" | sort
   elif cf_is_zsh >/dev/null; then
     print -l ${(ok)functions} | grep "cf_" | sort
   else
     echo "unsupported shell" && return
   fi
 }

 # get total memory (MB)
 function cf_mem_total() {
   if cf_is_linux >/dev/null; then
     free -m | awk '/^Mem/{print $2"M"}'
   elif cf_is_darwin >/dev/null; then
     sysctl hw.memsize | awk '{print $2/1024/1024"M"}'
   else
     echo "unsupported os" && return
   fi
 }

 # decimal to hexadecimal
 function cf_dec2Hex() {
   printf "%x" $
 }

 # decimal to octal
 function cf_dec2Oct() {
   printf "%o" $
 }

 # decimal to binary
 function cf_dec2Bin() {
   echo "obase=2; $1" | bc
 }

 # hexadecimal to decimal
 function cf_hex2Dec() {
   echo $((#$))
 }

 # octal to decimal
 function cf_oct2Dec() {
   echo $((#$))
 }

 # binary to decimal
 function cf_bin2Dec() {
   echo $((#$))
 }

 function cf_calc() {
   local exp="$1"
   echo "$exp" | bc -l | awk '{printf "%.2f", $0}'
 }

 # warning and exit, not for interactive shell
 function cf_die() {
   local msg="$1"
   local code=${:-}
   echo "$msg" && exit $code
 }

 # highlight key words from file or pipeline
 function cf_highlight() {
   local keyword="$1"
   local cgrep="$(_get_colorful_grep)"
   if [ -p /dev/stdin ]; then
     # from pipeline
     while IFS='' read line; do
       echo $line | eval "$cgrep -E \"${keyword}|$\""
     done
   else
     local file="$2"
     eval "$cgrep -E \"${keyword}|$\"" "$file"
   fi
 }

 function cf_ps_env() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return 

   if cf_is_linux >/dev/null; then
     xargs --null --max-args= < /proc/$pid/environ
   elif cf_is_darwin >/dev/null; then
     ps -wwE -p $pid
   else
     echo "unsupported os" && return
   fi
 }

 # get bash(current shell) major version
 function cf_bash_major_ver() {
   echo ${BASH_VERSINFO[]}
 }

 # get bash(current shell) minor version
 function cf_bash_minor_ver() {
   echo ${BASH_VERSINFO[]}
 }

 # get kernel version
 function cf_kernel_ver() {
   if cf_is_linux >/dev/null; then
     uname -r | cut -d'-' -f1
   elif cf_is_darwin >/dev/null; then
     uname -r | cut -d'-' -f1
   else
     echo "unsupported os" && return
   fi
 }

 # get kernel major version
 function cf_kernel_major_ver() {
   if cf_is_linux >/dev/null; then
     uname -r | awk -F'.' '{print $1"."$2}'
   elif cf_is_darwin >/dev/null; then
     uname -r | awk -F'.' '{print $1"."$2}'
   else
     echo "unsupported os" && return
   fi
 }

 # get kernel minor version
 function cf_kernel_minor_ver() {
   if cf_is_linux >/dev/null; then
     uname -r | awk -F'.' '{print $3}'
   elif cf_is_darwin >/dev/null; then
     uname -r | awk -F'.' '{print $3}'
   else
     echo "unsupported os" && return
   fi
 }

 # get value from config file such as app.properties
 function cf_get_property() {
   local file="$1"
   local key="$2"
   grep "^${key}=" "$file" | tr -d '\r' | cut -d'=' -f2 | cf_trim
 }

 # get command path, eg: `cf_command_path ls` output /usr/bin/ls
 function cf_command_path() {
   local cmd=$
   cf_is_bash && builtin type -P $cmd && return $?

   if [ -x /usr/bin/which ]; then
     local p=$( /usr/bin/which $ | head - )
     [ ! -z "$p" ] && echo $p && return
     return
   else
     local p=$( which $ | grep "^/" | head - )
     [ ! -z "$p" ] && echo $p && return
     return
   fi
 }

 # get all ip addresses
 function cf_ip_list() {
   if [ -x /sbin/ip ]; then
     local list=$(/sbin/ip -o - addr list | awk '{print $4}' | cut -d'/' -f1 | tr '\n' ',')
   else
     local list=$(/sbin/ifconfig | grep "inet " | awk '{print $2}' | sed 's/addr://' | tr '\n' ',')
   fi
   echo ${list%,}
 }

 function cf_stdio() {
   local pid=$
   /usr/sbin/lsof -a -p $pid -d ,,
 }

 function cf_stdout() {
   local pid=$
   if cf_is_linux >/dev/null; then
     readlink -f /proc/$pid/fd/
   elif cf_is_darwin >/dev/null; then
     /usr/sbin/lsof -a -p $pid -d  | awk 'NR>1{print $NF}'
   else
     echo "unsupported os" && return
   fi
 }

 # get file last modification time
 function cf_last_modification() {
   local file="$1"
   if [[ $OSTYPE == *linux* ]];then
     date +%Y%m%d%H%M%S -r $file
   elif [[ $OSTYPE == *darwin* ]];then
     stat -f "%Sm" -t "%Y%m%d%H%M%S" $file
   fi
 }

 # check current user is root
 function cf_is_root() {
   [ `whoami` = "root" ] && echo "true" && return
   echo "false" && return
 }

 # check current shell is interactive
 function cf_is_interactive_shell() {
   if cf_is_bash >/dev/null; then
     [[ "$-" = *i* ]] && echo "true" && return
   elif cf_is_zsh >/dev/null; then
     [[ -o interactive ]] && echo "true" && return
   else
     echo "unsupported shell" && return
   fi
   echo "false" && return
 }

 # check current shell is login shell
 function cf_is_login_shell() {
   if cf_is_bash >/dev/null; then
     shopt -q login_shell && echo "true" && return
   elif cf_is_zsh >/dev/null; then
     [[ -o login ]] && echo "true" && return
   else
     echo "unsupported shell" && return
   fi
   echo "false" && return
 }

 # check command is exists
 function cf_is_command_exists() {
   local cmd=$
   if [ -x /usr/bin/which ]; then
     /usr/bin/which $cmd >/dev/null >& && echo "true" && return
   else
     which $cmd >/dev/null >& && echo "true" && return
   fi
   echo "false" && return
 }

 # check file name globbing flag
 function cf_is_glob_enabled() {
   if cf_is_bash >/dev/null; then
     [[ $- != *f* ]] && echo "true" && return
   elif cf_is_zsh >/dev/null; then
     [[ -o glob ]] && echo "true" && return
   else
     echo "unsupported shell" && return
   fi
   echo "false" && return
 }

 # enable file name globbing
 function cf_enable_glob() {
   cf_is_bash >/dev/null && set +f && return
   cf_is_zsh >/dev/null && set -o glob && return
   echo "unsupported shell" && return
 }

 # disable file name globbing
 function cf_disable_glob() {
   cf_is_bash >/dev/null && set -f && return
   cf_is_zsh >/dev/null && set -o noglob && return
   echo "unsupported shell" && return
 }

 # check extglob flag
 function cf_is_extglob_enabled() {
   if cf_is_bash >/dev/null; then
     shopt -q extglob && echo "true" && return
   elif cf_is_zsh >/dev/null; then
     [[ -o kshglob ]] && echo "true" && return
   else
     echo "unsupported shell" && return
   fi
   echo "false" && return
 }

 # enable extglob
 function cf_enable_extglob() {
   cf_is_bash >/dev/null && shopt -s extglob && return
   cf_is_zsh >/dev/null && set -o kshglob && return
   echo "unsupported shell" && return
 }

 # disable extglob
 function cf_disable_extglob() {
   cf_is_bash >/dev/null && shopt -u extglob && return
   cf_is_zsh >/dev/null && unsetopt kshglob && return
   echo "unsupported shell" && return
 }

 # check pid is exists
 function cf_is_pid_exists() {
   local pid=$
   [ -z "$pid" ] && echo "false" && return
   kill - $pid >/dev/null >& && echo "true" && return
   echo "false" && return
 }

 function cf_is_java() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   ps -ocommand= -p$pid | awk '$1~/java$/' > /dev/null && echo "true" && return
   echo "false" && return
 }

 function cf_is_available_port() {
   local port=$
   if [[ "$OSTYPE" = *linux* ]];then
     local r=$( netstat -ant | awk '$6=="LISTEN" && $4~":'$port'$"' )
   elif [[ "$OSTYPE" = *darwin* ]];then
     local r=$( netstat -ant | awk '$6=="LISTEN"' | grep "\.$port " )
   else
     echo "unknown system" && return
   fi

   [ -z "$r" ] && echo "true" && return ;
   echo "false" && return  # port has been used
 }

 function cf_defined() {
   if cf_is_bash >/dev/null; then
     [[ ${!-X} == ${!-Y} ]]
   elif cf_is_zsh >/dev/null; then
     [[ ${(P)-X} == ${(P)-Y} ]]
   else
     echo "unsupported shell" && return
   fi
 }

 function cf_has_value() {
     cf_defined $ || return
     if cf_is_bash >/dev/null; then
       [[ -n ${!} ]] && return
     elif cf_is_zsh >/dev/null; then
       [[ -n ${(P)} ]] && return
     fi
     return
 }

 function cf_has_sudo_privilege() {
   # do not need password
   sudo -n echo >/dev/null >&
 }

 function cf_timestamp() {
   date +%F-%T | tr ':-' '_' #2015_12_01_22_15_22
 }

 function cf_length() {
   echo ${#}
 }

 # trim string
 function cf_trim() {
   if [ -p /dev/stdin ]; then
     while IFS='' read line; do
       _trim "$line"
     done
   else
     _trim "$1"
   fi
 }

 # private function
 function _trim() {
   local str="$1"
   local extglob=$(cf_is_extglob_enabled)
   if cf_is_bash >/dev/null || cf_is_zsh >/dev/null; then
     [ $extglob = "false" ] && cf_enable_extglob
     str="${str##*( )}"
     str="${str%%*( )}"
     [ $extglob = "false" ] && cf_disable_extglob
   else
     echo "unsupported shell" && return
   fi
   echo $str
 }

 function cf_lower() {
   echo "$1" | tr '[:upper:]' '[:lower:]'
 }

 function cf_upper() {
   echo "$1" | tr '[:lower:]' '[:upper:]'
 }

 function cf_ps_name() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   if cf_is_java $pid >/dev/null; then
     local main=$(cf_ps_java_main $pid)
     echo "java($main)"
   else
     ps -ocommand= -p $pid | awk '{print $1}'
   fi
 }

 function cf_ppid() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   ps -oppid= -p $pid
 }

 function cf_ps_java_main() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   ps -ocommand= -p $pid | tr ' ' '\n' | awk '/-classpath|-cp/{getline;next};/^-/{next}1' | awk 'NR==2'
 }

 function cf_ps_time() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return 

   local elapsed="$(ps -oetime= -p $pid | cf_trim)"
   local started="$(ps -olstart= -p $pid | cf_trim)"
   if [ `cf_is_gnu_date` = "true" ]; then
     started=$(date +'%Y-%m-%d %H:%M:%S' -d "$started")
   fi
   local cpu_time=$(ps -otime= -p $pid | cf_trim)
   echo "started from: $started, elapsed: $elapsed, cumulative cpu time: $cpu_time"
 }

 function cf_ps_zombies() {
   ps -opid,state,command -e | awk 'NR==1 || $2=="Z"'
 }

 function cf_connection_topology() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return 

   /usr/sbin/lsof -Pan -iTCP -p $pid > /tmp/.$pid.lsof
   grep -o "[0-9.:]*->[0-9.:]*" /tmp/.$pid.lsof > /tmp/.$pid.conns
   grep "LISTEN" /tmp/.$pid.lsof | awk '$9~/*/{print substr($9,3)}' > /tmp/.$pid.ports

   echo "-------------- downstream -------------"
   for port in $(cat /tmp/.$pid.ports); do
     cf_connection_list_by_port $port | awk '$6=="ESTABLISHED" {print $5}' | cut -d':' -f1 | sort | uniq -c | awk '{print $2"-->localhost:"'$port'" ("$1")"}'
   done

   echo "-------------- upstream ---------------"
   local portsExpr=$(cat /tmp/.$pid.ports | sed -e 's/^/:/' -e 's/$/->/' | xargs | sed 's/ /|/g')
   grep -Ev "$portsExpr" /tmp/.$pid.conns > /tmp/.$pid.out
   awk -F'->' '{print $2}' /tmp/.$pid.out | sort | uniq -c | sort -nrk1 | awk '{print "localhost-->"$2" ("$1")"}'
   rm -f /tmp/.$pid.lsof /tmp/.$pid.conns /tmp/.$pid.ports
 }

 function cf_connection_list_by_pid() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   /usr/sbin/lsof -Pan -iTCP -p $pid
 }

 function cf_connection_list_by_port() {
   local port=$
   netstat -ant| awk '$4~/[:.]'"$port"'$/'
 }

 function cf_connection_stat_by_pid() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   local interval=${:-}
   /usr/sbin/lsof -Pan -iTCP -p $pid -r $interval
 }

 function cf_connection_stat_by_port() {
   local port=$
   netstat -ant -c| awk '$1=="Proto"{print "\n"$0};$4~/[:.]'"$port"'$/'
 }

 function cf_listening_sockets() {
   #lsof -Pnl -i4TCP -sTCP:LISTEN #low version unsupported -sTCP params
   if cf_is_linux >/dev/null || cf_is_darwin >/dev/null; then
     if cf_has_sudo_privilege; then
       sudo /usr/sbin/lsof -Pnl -i4TCP | grep LISTEN
     else
       /usr/sbin/lsof -Pnl -i4TCP | grep LISTEN
     fi
   else
     netstat -plnt >/dev/null | grep -v tcp6
   fi
 }

 function cf_traffic_by_eth() {
   local eth=${:-"eth0"}
   if cf_is_linux >/dev/null; then
     [ ! -d /sys/class/net/$eth ] && echo "network interface not exists." && return
     while true; do
       local r1=`cat /sys/class/net/$eth/statistics/rx_bytes`
       local t1=`cat /sys/class/net/$eth/statistics/tx_bytes`
       sleep
       local r2=`cat /sys/class/net/$eth/statistics/rx_bytes`
       local t2=`cat /sys/class/net/$eth/statistics/tx_bytes`
       local rkbps=`cf_calc "( $r2 - $r1 ) / 1024"`
       local tkbps=`cf_calc "( $t2 - $t1 ) / 1024"`
       echo "$eth: RX $rkbps kB/s TX $tkbps kB/s"
     done
   elif cf_is_darwin >/dev/null; then
     # `netstat -I eth0 -w ` or `nettop -n -m tcp`
     declare -a tuple
     local _i1=
     cf_is_zsh >/dev/null && _i1=
     local _i2=
     cf_is_zsh >/dev/null && _i1=
     while true; do
       tuple=( $(netstat -nbi -I $eth | tail - | awk '{print $7,$10}') )
       local r1=${tuple[$_i1]}
       local t1=${tuple[$_i2]}
       sleep
       tuple=( $(netstat -nbi -I $eth | tail - | awk '{print $7,$10}') )
       local r2=${tuple[$_i1]}
       local t2=${tuple[$_i2]}
       local rkbps=`cf_calc "( $r2 - $r1 ) / 1024"`
       local tkbps=`cf_calc "( $t2 - $t1 ) / 1024"`
       echo "$eth: RX $rkbps kB/s TX $tkbps kB/s"
     done
   else
     echo "unsupported os" && return
   fi
 }

 function cf_traffic_by_pid() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return 

   # kernel 2.6. not support, must 2.6. or later?
   local pf="/proc/$pid/net/netstat"
   [ ! -f $pf ] && echo "$pf not found!" && return 

   declare -a tuple
   local _i1=
   cf_is_zsh >/dev/null && _i1=
   local _i2=
   cf_is_zsh >/dev/null && _i1=
   local pname="$(cf_ps_name $pid)"
   while true; do
     tuple=( $(grep "IpExt: " $pf | awk 'NR==2{print $8,$9}') )
     local r1=${tuple[$_i1]}
     local t1=${tuple[$_i2]}
     sleep
     tuple=( $(grep "IpExt: " $pf | awk 'NR==2{print $8,$9}') )
     local r2=${tuple[$_i1]}
     local t2=${tuple[$_i2]}
     local rkbps=`cf_calc "( $r2 - $r1 ) / 1024"`
     local tkbps=`cf_calc "( $t2 - $t1 ) / 1024"`
     echo "$pname: IN $rkbps kB/s OUT $tkbps kB/s"
   done
 }

 function cf_iotop() {
   sudo iotop -bod1
 }

 function cf_check_sum() {
   local dir=${:-$PWD}
   local dirsum=
   for sum  in $(find ${dir} -type f -print0 | xargs - cksum | awk '{print $1}')
   do
     dirsum=$(( ${sum} + ${dirsum} ))
   done
   echo ${dirsum}
 }

 function cf_java_classpath_check() {
   [ $# -eq  ] && echo "please enter classpath dir" && return
   [ ! -d "$1" ] && echo "not a directory" && return 

   local tmpfile="/tmp/.cp$(date +%s)"
   local tmphash="/tmp/.hash$(date +%s)"
   local verbose="/tmp/cp-verbose.log"

   if cf_is_zsh >/dev/null;then
     local -a files
     local begin=
   elif cf_is_bash >/dev/null;then
     declare -a files
     local begin=
   else
     echo "unsupported shell" && return
   fi
   files=(`find "$1" -name "*.jar"`)

   for f in $files; do
     jarName=`basename $f`
     list=`unzip -l $f | awk -v fn=$jarName '/\.class$/{print $NF,fn}'`
     size=`echo "$list" | wc -l`
     echo $jarName $size >> $tmphash
     echo "$list"
   done | sort | awk 'NF{ a[$1]++;m[$1]=m[$1]","$2}END{for(i in a) if(a[i] > 1) print i,substr(m[i],2)}' > $tmpfile

   awk '{print $2}' $tmpfile | awk -F',' '{i=1;for(;i<=NF;i++) for(j=i+1;j<=NF;j++) print $i,$j}' | sort | uniq -c | sort -nrk1 |
   while read line; do
     local dup=${line%% *}
     local jars=${line#* }
     local jar1=${jars% *}
     local jar2=${jars#* }
     local len_jar1=`grep -F "$jar1" $tmphash | grep ^"$jar1" | awk '{print $2}'`
     local len_jar2=`grep -F "$jar2" $tmphash | grep ^"$jar2" | awk '{print $2}'`
     local len=$(($len_jar1 > $len_jar2 ? $len_jar1 : $len_jar2))
     local per=$(echo "scale=2; $dup/$len" | bc -l)
     echo ${per/./} $dup $jar1 $jar2
   done | sort -nr -k1 -k2 | awk 'NR==1{print "Similarity DuplicateClasses File1 File2"}{print "%"$0}'| column -t

   sort $tmpfile | awk '{print $1,"\n\t\t",$2}' > $verbose
   echo "See $verbose for more details."

   rm -f $tmpfile
   rm -f $tmphash
 }

 function cf_java_class_find() {
   local libdir=$
   local name=$
   local glob=$(cf_is_glob_enabled)
   [ $glob = "false" ] && cf_enable_glob
   builtin pushd $libdir >/dev/null
   for j in *.jar; do
     unzip -l $j | grep $name && echo $j;
   done
   builtin popd >/dev/null
   [ $glob = "false" ] && cf_disable_glob
 }

 function cf_java_pids() {
   ps x | grep "jav[a]" | awk '{print $1}'
 }

 function cf_java_infos() {
   for p in `cf_java_pids`; do
     echo "java pid: $p"
     info=`ps -opid=,command= -p $p | tr ' ' '\n' | awk '/-classpath|-cp/{getline;next};/-Xmx|-Dcatalina.base/{print};/^-/{next};1' | xargs`
     echo "  $info"
     time=`cf_ps_time $p`
     echo "  $time"
   done
 }

 function cf_java_threads() {
   local pid=$
   local vm_threads="GC task|VM |CompilerThread|Finalizer|Reference Handler|Signal Dispatcher"
   "$JAVA_HOME"/bin/jstack $pid | grep "^\"" | grep -Ev "$vm_threads"
 }

 function cf_java_sysprops() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   "$JAVA_HOME"/bin/jinfo -sysprops $pid
 }

 function cf_jstack_series() {
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   local count=${:-}  # defaults  times
   local delay=${:-0.5} # defaults 0.5 seconds

   local logdir=${LOG_DIR:-"/tmp"}
   while [ $count -gt  ]; do
     if cf_is_gnu_date >/dev/null; then
       local suffix=$(date +%H%M%S.%N)
     else
       local suffix=$(date +%H%M%S)"."$count
     fi
     "$JAVA_HOME"/bin/jstack $pid > $logdir/jstack.$pid.$suffix
     sleep $delay
     let count--
     echo -n "."
   done
 }

 function cf_dmesg() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return 

   dmesg -T "$@" >/dev/null
   [ $? -eq  ] && return 

   dmesg "$@" | perl -w -e 'use strict;
   my ($uptime) = do { local @ARGV="/proc/uptime";<>}; ($uptime) = ($uptime =~ /^(\d+)\./);
   foreach my $line (<>) {
     printf( ($line=~/^\[\s*(\d+)\.\d+\](.+)/) ? ( "[%s]%s\n", scalar localtime(time - $uptime + $), $ ) : $line )
   }'
 }

 function cf_trace_http_request() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e read -s  -qftp $pid >& | grep " HTTP/1[.][01][\]r[\]n"
 }

 function cf_trace_http_response() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e write -s  -qftp $pid >& | grep "HTTP/1[.][01] "
 }

 function cf_trace_http_req_header() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e read -s  -qftp $pid >& | grep " HTTP/1[.][01][\]r[\]n" | sed  's/\\r\\n/\n/g'
 }

 function cf_trace_http_resp_header() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e write -s  -qftp $pid >& | grep "HTTP/1[.][01] " | sed 's/\\r\\n/\n/g'
 }

 function cf_trace_http_invoke() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e sendto -s  -qftp $pid >& | grep " HTTP/1[.][01][\]r[\]n"
 }

 function cf_trace_connect() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e connect -s  -qftp $pid >& | grep "port"
 }

 function cf_trace_socket() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e connect,socket,close -s  -qftp $pid >& | grep "port"
 }

 function cf_trace_sql_select() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e sendto,write -s  -qftp $pid >& | grep -i "[\]3select"
 }

 function cf_trace_sql_update() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e sendto,write -s  -qftp $pid >& | grep -i "[\]3update"
 }

 function cf_trace_sql_insert() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e sendto,write -s  -qftp $pid >& | grep -i "[\]3insert"
 }

 function cf_trace_redis_command() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   local cmd=$
   strace -e sendto,write -s  -qftp $pid >& | grep -i "$cmd[\]r[\]n"
 }

 function cf_trace_dubbo_request() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e read -s  -qftp $pid >& | grep -i "[\]tinterface"
 }

 function cf_trace_dubbo_invoke() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   strace -e write -s  -qftp $pid >& | grep -i "[\]tinterface"
 }

 function cf_trace_system_call() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   local pid=$
   ! cf_is_pid_exists >/dev/null $pid && echo "pid:$pid not exists" && return
   local time=${:-}

   local outfile="/tmp/.sys-call.$pid"
   strace -cqftp $pid -o $outfile &
   local spid=$!
   while [ $time -gt  ]; do
     sleep
     let time--
     echo -n "."
   done
   echo ""
   kill $spid && echo "ok"
   # if strace process still exists
   cf_is_pid_exists $spid >/dev/null >& && kill - $spid
   cat $outfile && rm -f $outfile
 }

 function cf_random_entropy_stat() {
   ! cf_is_linux >/dev/null && echo "only works in linux" && return
   while true; do
     echo "entropy available:" `cat /proc/sys/kernel/random/entropy_avail`
     sleep
   done
 }

 function cf_json_fmt() {
   python -mjson.tool
 }

 function cf_http_server() {
   local port=${:-}
   python -mSimpleHTTPServer $port >/dev/null
 }