shell脚本（初学者练习）

一些简单的shell脚本题目练习

1.查找当前网段（10.1.1.0/24）内存活IP用户，并输出存活用户，重定向到/tmp/ip.txt文件中(ping)

#!/bin/bash
touch /tmp/ip.txt
for i in {1..254}; do(
      ping -c 1 -W 1 10.1.1.$i > /dev/null 2>&1
      if [ $? -eq 0 ] ; then
           echo "$i is alive"
           echo "10.1.1.$i" >> /tmp/ip.txt
      else
           echo "$i is dead"
      fi
        )
done

2.自动创建用户student101-150，且密码为password101-150

#!/bin/bash

for i in {101..150}
do
         useradd student$i
         echo "passwd$i" | passwd --stdin student$i
done

3.根据passwd文件内容，输出“The line 1(行数) is root（用户名）”依次类推

#!/bin/bash

n=0
while read line
do
  let n++
  user=`echo $line | cut -d: -f1`
  echo "The line$n is $user"
done < /etc/passwd

4.写一个脚本，显示当前系统上shell为-s指定类型的shell，并统计其用户总数。-s选项后面跟的参数必须是/etc/shells文件中存在的shell类型，否则不执行此脚本。另外，此脚本还可以接受--help选项，以显示帮助信息。

例：

./test8.sh -s bash

bash，3users，they are:

root redhat gentoo

#!/bin/bash

if [ $# -eq 2 ] ; then
case $1 in
-s)
  type=`grep "$2" /etc/shells | cut -d/ -f3`
  count=`grep "$2$" /etc/passwd | wc -l`
  user=`grep "$2$" /etc/passwd | cut -d: -f1`
  echo "$type,$count,they are:
$user" 
;;
--help)
        case $2 in
        me)
        echo "
        hello!
        this script is to calculate bash user and show message
        option:
        --help me: see the manual of use
        -s [bash type]: show the bash user
        "
        ;;
        *)
        echo "
        wrong option,please type '--help me' to look for help
        "
        ;;
        esac
;;
*)
echo "
wrong option,please type '--help me' to look for help
"
;;
esac
fi

5.ldd是用来查看二进制程序的共享库文件的,现在通过脚本实现把库文件自动的复制到固定目录(/newroot)的相对应的目录中,如源库文件:/lib/a.so.1,应复制到/newroot/lib/a.so.1

#!/bin/bash

read -p "input command: " command
NEWroot="/newroot"

ldd `which $command` | grep '/' | grep -P -o '/lib(64){0,1}[^\s]{0,}' |
while read line;do
        NEWdoc=$line
        NEWdir=${line%/*}
        mkdir -p $NEWroot$NEWdir
        cp -r $NEWdoc $NEWroot$NEWdir
        echo "cp $NEWdir$line is done"
done

结果

[root 16:40:54@localhost sbin]$ (1) cpldd.sh
input command: ping
cp /lib64/lib64/libcap.so.2 is done
cp /lib64/lib64/libidn.so.11 is done
cp /lib64/lib64/libcrypto.so.10 is done
cp /lib64/lib64/libresolv.so.2 is done
cp /lib64/lib64/libm.so.6 is done
cp /lib64/lib64/libc.so.6 is done
cp /lib64/lib64/libattr.so.1 is done
cp /lib64/lib64/libdl.so.2 is done
cp /lib64/lib64/libz.so.1 is done
cp /lib64/lib64/ld-linux-x86-64.so.2 is done
[root 16:41:01@localhost sbin]$ (2) ll /newroot
total 4
drwxr-xr-x. 2 root root 4096 Jan 13 16:41 lib64
[root 16:41:07@localhost sbin]$ (3) ll /newroot/lib64
total 0
lrwxrwxrwx. 1 root root 10 Jan 13 16:41 ld-linux-x86-64.so.2 -> ld-2.17.so
lrwxrwxrwx. 1 root root 16 Jan 13 16:41 libattr.so.1 -> libattr.so.1.1.0
lrwxrwxrwx. 1 root root 14 Jan 13 16:41 libcap.so.2 -> libcap.so.2.22
lrwxrwxrwx. 1 root root 19 Jan 13 16:41 libcrypto.so.10 -> libcrypto.so.1.0.2k
lrwxrwxrwx. 1 root root 12 Jan 13 16:41 libc.so.6 -> libc-2.17.so
lrwxrwxrwx. 1 root root 13 Jan 13 16:41 libdl.so.2 -> libdl-2.17.so
lrwxrwxrwx. 1 root root 17 Jan 13 16:41 libidn.so.11 -> libidn.so.11.6.11
lrwxrwxrwx. 1 root root 12 Jan 13 16:41 libm.so.6 -> libm-2.17.so
lrwxrwxrwx. 1 root root 17 Jan 13 16:41 libresolv.so.2 -> libresolv-2.17.so
lrwxrwxrwx. 1 root root 13 Jan 13 16:41 libz.so.1 -> libz.so.1.2.7