写一个脚本/root/bin/createuser.sh，实现如下功能：使用一个用户名做为参数，如果指定参数的用户存在，就显示其存在，否则添加之；显示添加的用户的id号等信息
[root@www sh.log]# cat createuser.sh #!/bin/bash #author #使用一个用户名作为参数，如果指定参数的用户存在，就显示其存在，否则添加，显示添加用户的id号等信息 read -p "username:" user id $user &> /dev/null if [ $? -eq 0 ];then echo "$user already exist" else useradd $user &> /dev/null echo "`id $user`" fi [root@www sh.log]# bash createuser.sh username:wang wang already exist [root@www sh.log]# bash createuser.sh username:xiaodeng uid=1002(xiaodeng) gid=1002(xiaodeng) groups=1002(xiaodeng)
写一个脚本/root/bin/yesorno.sh，提示用户输入yes或no,并判断用户输入的是yes还是no,或是其它信息
[root@www sh.log]# cat yesorno.sh #!/bin/bash #author:DYW #提示用户输入yes或no，并判断用户输入的是yes还是no，或是其他信息 read -p "input yes or no please:" biu piu=`echo "$biu" | tr "[a-z]" "[A-Z]"` case $piu in Y|YES) echo "you select yes" ;; N|NO) echo "you select no" ;; *) echo "you select others" ;; esac [root@www sh.log]# bash yesorno.sh input yes or no please:yES you select yes [root@www sh.log]# bash yesorno.sh input yes or no please:YEs you select yes [root@www sh.log]# bash yesorno.sh input yes or no please:No you select no [root@www sh.log]# bash yesorno.sh input yes or no please:12312 you select others
写一个脚本/root/bin/filetype.sh,判断用户输入文件路径，显示其文件类型（普通，目录，链接，其它文件类型）
[root@www sh.log]# bash filetype.sh input filename please:/sh.log/qiuhe.sh The /sh.log/qiuhe.sh is ordinary file [root@www sh.log]# cat filetype.sh #!/bin/bash #suthor:DYW #判断用户输入文件路径，显示其文件类型（普通，目录，链接，其他文件类型） read -p "input filename please:" file if [ -z $file ];then echo "Please enter a path" else if [ -L $file ];then echo "The $file is Symbol file" elif [ -c $file ];then echo "The $file is char file" elif [ -d $file ];then echo "The $file is dir file" elif [ -b $file ];then echo "The $file is block file" elif [ -f $file ];then echo "The $file is ordinary file" elif [ -p $file ];then echo "The $file is pipe file" elif [ -S $file ];then echo "The $file is scoket file" else echo "Enter the correct file path" fi fi [root@www sh.log]# bash filetype.sh input filename please:/wang/file1 The /wang/file1 is ordinary file [root@www sh.log]# bash filetype.sh input filename please:/wang/jiaoben.sh Enter the correct file path [root@www sh.log]# bash filetype.sh input filename please:/wang/jiaoben1.sh The /wang/jiaoben1.sh is ordinary file [root@www sh.log]# bash filetype.sh input filename please:/usr/bin The /usr/bin is dir file
写一个脚本/root/bin/checkint.sh,判断用户输入的参数，是否为正整数
[root@www sh.log]# cat cheskint.sh #!/bin/bash #author:DYW #判断用户输入的参数，是否为正整数 read -p "input a number please:" number if [ -z $number ];then echo "You must input a number!" exit else if let var=$number &>/dev/null;then if [ $? -eq 0 ];then if [ $number -lt 0 ];then echo "$number is Negative integer" elif [ $number -gt 0 ];then echo "$number is Positive integer" else echo "$number is 0" fi fi else echo "$number is not integer" fi fi [root@www sh.log]# bash cheskint.sh input a number please:10 10 is Positive integer [root@www sh.log]# bash cheskint.sh input a number please:-112 -112 is Negative integer [root@www sh.log]# bash cheskint.sh input a number please:0 0 is not integer [root@www sh.log]# bash cheskint.sh input a number please: You must input a number! [root@www sh.log]# bash cheskint.sh input a number please:asdhiuadqwl asdhiuadqwl is not integer
查找/var目录下属主为root，且属组为mail的所有文件
[root@www ~]# find /var -user root -group mail -ls 134321240 0 drwxrwxr-x 2 root mail 46 Aug 12 18:30 /var/spool/mail
查找/var目录下不属于root、lp、gdm的所有文件
[root@www ~]# find /var/ -not \( -user root -o -user lp -o -user gdm \) -ls 134686482 0 drwx------ 2 tss tss 6 Nov 21 2015 /var/lib/tpm 443945 0 drwx------ 2 postfix root 24 Aug 9 06:23 /var/lib/postfix 833 4 -rw------- 1 postfix postfix 33 Aug 9 17:41 /var/lib/postfix/master.lock 134914400 0 -rw-rw---- 1 wang mail 0 Aug 11 13:02 /var/spool/mail/wang 134974157 0 -rw-rw---- 1 laowang mail 0 Aug 12 10:10 /var/spool/mail/laowang 134993654 0 -rw-rw---- 1 xiaodeng mail 0 Aug 12 18:30 /var/spool/mail/xiaodeng 134924704 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/active 202230254 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/bounce 443946 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/corrupt 67719609 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/defer 134924705 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/deferred 202230255 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/flush 443947 0 drwx------ 2 postfix root 6 Jun 10 2014 /var/spool/postfix/hold 6 Jun 10 2014 /var/spool/postfix/trace ...
查找/var目录下最近一周内其内容修改过，同时属主不为root，也不是postfix的文件
[root@www ~]# find /var/ \( -not \( -user root -o -user postfix \) -mtime -7 \) -ls 134914400 0 -rw-rw---- 1 wang mail 0 Aug 11 13:02 /var/spool/mail/wang 134974157 0 -rw-rw---- 1 laowang mail 0 Aug 12 10:10 /var/spool/mail/laowang 134993654 0 -rw-rw---- 1 xiaodeng mail 0 Aug 12 18:30 /var/spool/mail/xiaodeng 134993684 0 -rw-rw---- 1 gdm mail 0 Aug 12 23:03 /var/spool/mail/gdm [root@www ~]# stat /var/spool/mail/wang File: ‘/var/spool/mail/wang’ Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: fd00h/64768d Inode: 134914400 Links: 1 Access: (0660/-rw-rw----) Uid: ( 1000/ wang) Gid: ( 12/ mail) Context: unconfined_u:object_r:mail_spool_t:s0 Access: 2016-08-11 13:02:38.126781165 +0800 Modify: 2016-08-11 13:02:38.126781165 +0800 Change: 2016-08-11 13:02:38.126781165 +0800 Birth: -
查找当前系统上没有属主或属组，且最近一个周内曾被访问过的文件
[root@www ~]# find / \( -nouser -o -nogroup \) -atime -7
查找/etc目录下大于1M且类型为普通文件的所有文件
[root@www ~]# find /etc/ \( -size +1M -o -type f \) -ls 134320258 4 -rw-r--r-- 1 root root 541 Aug 9 05:48 /etc/fstab 134320259 0 -rw------- 1 root root 0 Aug 9 05:48 /etc/crypttab 134993652 4 -rw-r--r-- 1 root root 81 Aug 12 20:25 /etc/resolv.conf 151 4 -rw-r--r-- 1 root root 1690 Dec 9 2015 /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 152 4 -rw-r--r-- 1 root root 1004 Dec 9 2015 /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-Debug-7 153 4 -rw-r--r-- 1 root root 1690 Dec 9 2015 /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-Testing-7 67355015 4 -rw-r--r-- 1 root root 2388 Jun 29 2015 /etc/pki/tls/certs/Makefile 67355016 4 -rwxr-xr-x 1 root root 610 Jun 29 2015 /etc/pki/tls/certs/make-dummy-cert 67355017 4 -rwxr-xr-x 1 root root 829 Jun 29 2015 /etc/pki/tls/certs/renew-dummy-cert 134484404 8 -rwxr-xr-x 1 root root 5178 Jun 29 2015 /etc/pki/tls/misc/CA 134484405 4 -rwxr-xr-x 1 root root 119 Jun 29 2015 /etc/pki/tls/misc/c_hash 134484406 4 -rwxr-xr-x 1 root root 152 Jun 29 2015 /etc/pki/tls/misc/c_info 134484407 4 -rwxr-xr-x 1 root root 112 Jun 29 2015 /etc/pki/tls/misc/c_issuer ..... [root@www ~]# stat /etc/hostname File: ‘/etc/hostname’ Size: 22 Blocks: 8 IO Block: 4096 regular file Device: fd00h/64768d Inode: 134974153 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Context: system_u:object_r:hostname_etc_t:s0 Access: 2016-08-11 07:51:46.178807313 +0800 Modify: 2016-08-09 05:56:51.103010237 +0800 Change: 2016-08-09 05:56:51.103010237 +0800 Birth: -
查找/etc目录下所有用户都没有写权限的文件
[root@www ~]# find /etc/ -not -perm /222 -ls 67305775 196 -r--r--r-- 1 root root 198453 Aug 9 05:50 /etc/pki/ca-trust/extracted/java/cacerts 134417508 352 -r--r--r-- 1 root root 359773 Aug 9 05:50 /etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt 201627950 264 -r--r--r-- 1 root root 266702 Aug 9 05:50 /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem 201627951 216 -r--r--r-- 1 root root 217510 Aug 9 05:50 /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem 201627952 208 -r--r--r-- 1 root root 211626 Aug 9 05:50 /etc/pki/ca-trust/extracted/pem/objsign-ca-bundle.pem ...
查找/etc目录下至少有一类用户没有执行权限的文件
[root@www ~]# find /etc/ -not -perm -111 -ls 134751833 4 -rw-r--r-- 1 root root 936 Mar 6 2015 /etc/mke2fs.conf 134974150 4 -rw-r--r-- 1 root root 37 Aug 9 05:56 /etc/vconsole.conf 134974152 4 -rw-r--r-- 1 root root 19 Aug 9 05:56 /etc/locale.conf 134974153 4 -rw-r--r-- 1 root root 22 Aug 9 05:56 /etc/hostname 134679689 4 -rw-r--r-- 1 root root 163 Aug 9 05:49 /etc/.updated 134914398 12 -rw-r--r-- 1 root root 12288 Aug 9 06:23 /etc/aliases.db ...
查找/etc/init.d目录下，所有用户都有执行权限，且其它用户有写权限的文件
[root@www ~]# find /etc/init.d/ -perm -113 -ls 67830539 0 ---x--x-wx 1 root root 0 Aug 13 02:40 /etc/init.d/file1 ...
原创文章，作者：DYW，如若转载，请注明出处：http://www.178linux.com/36055
