getopt()用法详解 https://blog.csdn.net/qq_22642239/article/details/106462986

    1. #!/bin/bash
    3. # @Function
    5. # Find out the highest cpu consumed threads of java,and print the stack of these threads.
    7. #
    9. # @Usage
    11. # $ ./show-busy-java-threads.sh
    13. #
    15. # @author XieQing
    17. PROG=`basename $0`
    19. usage() {
    20. cat <EOF
    22. Usage: ${PROG} [OPTION]...
    24. Find out the highest cpu consumed threads of java,and print the stack of these threads.
    26. Example: ${PROG} -c 10
    28. Options:
    30. -p,--pid find out the highest cpu consumed threads from the specifed java process,default from all java process.
    32. -c,--count set the thread count to show,default is 5
    34. -h,--help display this help and exit
    36. EOF
    38. exit $1
    40. }
    42. ARGS=`getopt -n "$PROG" -a -o c:p:h -l count:,pid:,help -- "[email protected]"`
    44. [ $? -ne 0 ] && usage 1
    46. eval set -- "${ARGS}"
    48. while true; do
    50. case "$1" in
    52. -c|--count)
    54. count="$2"
    56. shift 2
    58. ;;
    60. -p|--pid)
    62. pid="$2"
    64. shift 2
    66. ;;
    68. -h|--help)
    70. usage
    72. ;;
    74. --)
    76. shift
    78. break
    80. ;;
    82. esac
    84. done
    86. count=${count:-5}
    88. redEcho() {
    89. [ -c /dev/stdout ] && {
    90. # if stdout is console,turn on color output.
    92. echo -ne "\033[1;31m"
    94. echo -n "[email protected]"
    96. echo -e "\033[0m"
    98. } || echo "[email protected]"
    100. }
    102. # Check the existence of jstack command!
    104. if ! which jstack &> /dev/null; then
    106. [ -z "$JAVA_HOME" ] && {
    107. redEcho "Error: jstack not found on PATH!"
    109. exit 1
    111. }
    113. ! [ -f "$JAVA_HOME/bin/jstack" ] && {
    114. redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack file does NOT exists!"
    116. exit 1
    118. }
    120. ! [ -x "$JAVA_HOME/bin/jstack" ] && {
    121. redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack is NOT executalbe!"
    123. exit 1
    125. }
    127. export PATH="$JAVA_HOME/bin:$PATH"
    129. fi
    131. uuid=`date +%s`_${RANDOM}_$$
    133. cleanupWhenExit() {
    134. rm /tmp/${uuid}_* &> /dev/null
    136. }
    138. trap "cleanupWhenExit" EXIT
    140. printStackOfThread() {
    141. while read threadLine ; do
    143. pid=`echo ${threadLine} | awk '{print $1}'`
    145. threadId=`echo ${threadLine} | awk '{print $2}'`
    147. threadId0x=`printf %x ${threadId}`
    149. user=`echo ${threadLine} | awk '{print $3}'`
    151. pcpu=`echo ${threadLine} | awk '{print $5}'`
    153. jstackFile=/tmp/${uuid}_${pid}
    155. [ ! -f "${jstackFile}" ] && {
    156. jstack ${pid} > ${jstackFile} || {
    157. redEcho "Fail to jstack java process ${pid}!"
    159. rm ${jstackFile}
    161. continue
    163. }
    165. }
    167. redEcho "Busy(${pcpu}%) thread(${threadId}/0x${threadId0x}) stack of java process(${pid}) under user(${user}):"
    169. sed "/nid=0x${threadId0x} /,/^$/p" -n ${jstackFile}
    171. done
    173. }
    175. ps -Leo pid,lwp,user,comm,pcpu --no-headers | {
    176. [ -z "${pid}" ] &&
    178. awk '$4=="java"{print $0}' ||
    180. awk -v "pid=${pid}" '$1==pid,$4=="java"{print $0}'
    182. } | sort -k5 -r -n | head --lines "${count}" | printStackOfThread