我有一个基于文件名的简单解决方案

#!/bin/bash

MY_FILENAME=`basename "$BASH_SOURCE"`

MY_PROCESS_COUNT=$(ps a -o pid,cmd | grep $MY_FILENAME | grep -v grep | grep -v $$ | wc -
l)

if [ $MY_PROCESS_COUNT -ne 0  ]; then
  echo found another process
  exit 0
if

# Follows the code to get the job done.

又快又脏?

#!/bin/sh

if [ -f sometempfile ]
  echo "Already running... will now terminate."
  exit
else
  touch sometempfile
fi

..do what you want here..

rm sometempfile

又快又脏?脚本顶部的一行代码可以工作:

[[ $(pgrep -c "`basename \"$0\"`") -gt 1 ]] && exit

当然，只要确保您的脚本名称是唯一的。：）

试试下面的方法，

ab=`ps -ef | grep -v grep | grep -wc processname`

然后使用if循环将变量与1匹配。

下面是一种方法，它结合了原子目录锁定和通过PID检查过期锁，如果过期就重新启动。此外，这并不依赖于任何羞怯。

#!/bin/dash

SCRIPTNAME=$(basename $0)
LOCKDIR="/var/lock/${SCRIPTNAME}"
PIDFILE="${LOCKDIR}/pid"

if ! mkdir $LOCKDIR 2>/dev/null
then
    # lock failed, but check for stale one by checking if the PID is really existing
    PID=$(cat $PIDFILE)
    if ! kill -0 $PID 2>/dev/null
    then
       echo "Removing stale lock of nonexistent PID ${PID}" >&2
       rm -rf $LOCKDIR
       echo "Restarting myself (${SCRIPTNAME})" >&2
       exec "$0" "$@"
    fi
    echo "$SCRIPTNAME is already running, bailing out" >&2
    exit 1
else
    # lock successfully acquired, save PID
    echo $$ > $PIDFILE
fi

trap "rm -rf ${LOCKDIR}" QUIT INT TERM EXIT


echo hello

sleep 30s

echo bye

这个例子是在man flock中解释的，但它需要一些改进，因为我们应该管理bug和退出代码:

   #!/bin/bash
   #set -e this is useful only for very stupid scripts because script fails when anything command exits with status more than 0 !! without possibility for capture exit codes. not all commands exits >0 are failed.

( #start subprocess
  # Wait for lock on /var/lock/.myscript.exclusivelock (fd 200) for 10 seconds
  flock -x -w 10 200
  if [ "$?" != "0" ]; then echo Cannot lock!; exit 1; fi
  echo $$>>/var/lock/.myscript.exclusivelock #for backward lockdir compatibility, notice this command is executed AFTER command bottom  ) 200>/var/lock/.myscript.exclusivelock.
  # Do stuff
  # you can properly manage exit codes with multiple command and process algorithm.
  # I suggest throw this all to external procedure than can properly handle exit X commands

) 200>/var/lock/.myscript.exclusivelock   #exit subprocess

FLOCKEXIT=$?  #save exitcode status
    #do some finish commands

exit $FLOCKEXIT   #return properly exitcode, may be usefull inside external scripts

你可以用另一种方法，列出我过去用过的过程。但这比上面的方法要复杂得多。你应该按ps列出进程，按其名称过滤，附加过滤器grep -v grep清除寄生虫，最后按grep -c计数。和数字比较。这是复杂而不确定的