grep find shell base

1, define an alias command for all users in force, for example: lftps = '172.168.0.1 / pub'

        echo "alias lftps='172.168.0.1/pub'" >> /etc/bashrc && source /etc/bashrc

2, the display / etc / passwd file are not at all / bin / bash line end

         grep -v "/bin/bash$" /etc/passwd

3, to find the / etc / passwd file, contains two or three digits line numbers

        grep "\<[0-9]\{2,3\}\>" /etc/passwd

4, display line / proc / meminfo s at the beginning of the file case, three ways

        grep -i '^s' /proc/meminfo
        grep  '^[sS]]' /proc/meminfo
        grep -E '^(s|S)' /proc/meminfo

5, an absolute path echo out using the type of execution path name egrep take dirname / etc / passwd results

        echo "/a/b/c/d" | egrep  -o  '.*/'

6 to find the ip address in ifconfig, requiring only the results show ip address

        ifconfig | egrep -o 'inet (addr:)?([0-9]*\.){3}[0-9]*' | egrep -o '([0-9]*\.){3}[0-9]*' | head -n 1

7 vim customized automatic indenting 4 characters
CAT >> / etc / vimrc << EOF
the SET ai
the SET 4 the TabStop =
EOF
8 scripting, automatically add three users, and calculate the uid of these three users and

        #!/bin/bash
        #
        sum_uid=0
        for account in user1 user2 user3
        do
        if id $account &> /dev/null
        then echo "$account exists" 
        else
        useradd $account
        fi
        uid=$(id -u $account)
        sum_uid=$[$sum_uid+$uid]
        done
        echo "3个用户的UID之和是 $sum_uid"

9 find examples of common usage and

        fine [options] [查找起始路径] [查找条件] [处理动作]

            -name 文件名查找 支持glob
            -iname  忽略大小写
                    根据从属查找
                          -user USERNAME

                          -user groupname

                          -uid

                          -gid

                          -nouser 查找没有属主的文件

                          -nogroup
                    文件类型查找
                          -type

                            f 普通文件

                            d 目录文件

                            l 符号链接文件

                            b 块设备文件

                            c 字符设备文件

                            p 管道文件

                            s 套接字
                    组合查找
                            与:-a
                            或:-o
                            非:-not,!
                    文件大小

                        -size  [+|-]#unit

                        常用单位：k M G

                        #unit: (#-1, #]

                        -#unit: [0 - #-1 ]

                        +#unit: (#, 无穷大)
                    时间
                        以天为单位
                             -atime [+|-]# 访问
                             #: 过去第几天 [#，#-1)
                             -# (#, 0] 过去#天内
                             +#  (00, #-1] 超过多少天
                             -mtime 修改
                             -ctime 更改
                        以分为单位
                            -amin
                            -mmin
                            -cmin
                    权限
                        -perm [+|-]mode
                            mode:与mode精确匹配
                            +mode:ugo组有一组满足都可以
                            -mode:小于mode的权限即可
                    处理动作:
                        -print     输出至标准输出 默认的动作
                        -ls
                        -delete 删除
                        -fls /path 查找的文件详细信息保存到指定文件中
                        -ok COMMAND {} \;  对查找到的每个文件执行由COMMAND指定的命令,每次操作由 用户确认
                        -exec COMMANd {} \; 对查找到的每个文件执行由COMMAND指定的命令，每次操作不需要用户确认

grep find shell base

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