Shell脚本编程案例集(持续更新)

本文介绍了如何使用Shell脚本检查端口占用情况,并演示了统计恶意IP尝试登录次数的方法,包括从腾讯云服务器的日志中提取信息,分析IP归属地,以及如何处理高频率尝试登录的IP。

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1.端口占用

检测端口占用情况,如果被占用则随机分配指定范围内端口。

脚本

#!/bin/bash
#
# 检测端口占用,如果占用则随机分配指定范围内端口

# 端口范围
min=10800
max=12000

port="$1"
if [[ -z "${port}" ]]; then
  echo "Usage: $0 PORT"
  exit 1
fi

# 检测端口占用
while lsof -i:"${port}" ; do
  port=$((RANDOM%$(( ${max} - ${min} )) + ${min} ))

  
Shell脚本高级编程教程,希望对你有所帮助。 Example 10-23. Using continue N in an actual task: 1 # Albert Reiner gives an example of how to use "continue N": 2 # --------------------------------------------------------- 3 4 # Suppose I have a large number of jobs that need to be run, with 5 #+ any data that is to be treated in files of a given name pattern in a 6 #+ directory. There are several machines that access this directory, and 7 #+ I want to distribute the work over these different boxen. Then I 8 #+ usually nohup something like the following on every box: 9 10 while true 11 do 12 for n in .iso.* 13 do 14 [ "$n" = ".iso.opts" ] && continue 15 beta=${n#.iso.} 16 [ -r .Iso.$beta ] && continue 17 [ -r .lock.$beta ] && sleep 10 && continue 18 lockfile -r0 .lock.$beta || continue 19 echo -n "$beta: " `date` 20 run-isotherm $beta 21 date 22 ls -alF .Iso.$beta 23 [ -r .Iso.$beta ] && rm -f .lock.$beta 24 continue 2 25 done 26 break 27 done 28 29 # The details, in particular the sleep N, are particular to my 30 #+ application, but the general pattern is: 31 32 while true 33 do 34 for job in {pattern} 35 do 36 {job already done or running} && continue 37 {mark job as running, do job, mark job as done} 38 continue 2 39 done 40 break # Or something like `sleep 600' to avoid termination. 41 done 42 43 # This way the script will stop only when there are no more jobs to do 44 #+ (including jobs that were added during runtime). Through the use 45 #+ of appropriate lockfiles it can be run on several machines 46 #+ concurrently without duplication of calculations [which run a couple 47 #+ of hours in my case, so I really want to avoid this]. Also, as search 48 #+ always starts again from the beginning, one can encode priorities in 49 #+ the file names. Of course, one could also do this without `continue 2', 50 #+ but then one would have to actually check whether or not some job 51 #+ was done (so that we should immediately look for the next job) or not 52 #+ (in which case we terminate or sleep for a long time before checking 53 #+ for a new job).
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