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              Linux基礎教程之vim、定時任務、腳本初步應用及詳解

              1、復制/etc/rc.d/rc.sysinit文件至/tmp目錄,將/tmp/rc.sysinit文件中的以至少一個空白字符開頭的行的行首加#;

              ??~]#cp??/etc/rc.d/rc.sysinit???/tmp
              ??在末行模式下輸入:%s@^[[:space:]]\+[^[:space:]]@#&@g
              ????&:匹配模式找到的全部文本
              ????&=^[[:space:]]\+[^[:space:]]

              2、復制/boot/grub/grub.conf至/tmp目錄中,刪除/tmp/grub.conf文件中的行首的空白字符;

              ~]#cp?/boot/grub/grub.conf?/tmp
              在末行模式下輸入:%s@^[[:space:]]\+@@

              3、刪除/tmp/rc.sysinit文件中的以#開頭,且后面跟了至少一個空白字符的行行的#和空白字符

              在末行模式下輸入:%s@^#[[:space:]]\+@@g

              4、為/tmp/grub.conf文件中前三行的行首加#號;

              在末行模式下輸入:1,3s@^@#

              5、將/etc/yum.repos.d/CentOS-Media.repo文件中所有的enabled=0或gpgcheck=0的最后的0修改為1;

              在末行模式下輸入:%s@\(enabled\|gpgcheck\)=0@\1=1@g
              \1是后向引用,就是正則表達式中匹配到的項
              \1=enabled或gpgcheck

              6、每4小時執行一次對/etc目錄的備份,備份至/backup目錄中,保存的目錄名為形如etc-201504020202

              crontab?-e??進入編輯界面
              00?*/4?*?*?*?cp?-r?/backup/etc-$(date?+\%Y\%m\%d\%H\%M)
              
              %前要用轉義\

              7、每周2,4,6備份/var/log/messages文件至/backup/messages_logs/目錄中,保存的文件名形如messages-20150402

              crontab?-e??進入編輯界面
              ~】#00?00?*?*?2,4,6?cp?-r?/var/log/messages?/backup/messages_logs/messages-$(date?+\%Y\%m\%d)
              
              %前要用轉義\

              8、每天每兩小時取當前系統/proc/meminfo文件中的所有以S開頭的信息至/stats/memory.txt文件中

              crontab?-e??進入編輯界面
              00?*/2?*?*?*?cat?/proc/meminfo?|grep?"^S"?>>?/stats/memory.txt

              9、工作日的工作時間內,每兩小時執行一次echo “”howdy””

              00?9-18/2?*?*?1-5?echo?"howdy"

              腳本編程練習

              10、創建目錄/tmp/testdir-當前日期時間; 并在此目錄創建100個空文件:file1-file100。

              #!/bin/bash
              #
              ?????????mkdir?/tmp/testdir-$(date?+%Y%m%d%H%M%)
              ????????????????cd?/tmp/testdir-$(date?+%Y%m%d%H%M%)
              ????????for?i?in?{1..100};do
              ????????????????mkdir?file$i
              ????????done

              12、顯示/etc/passwd文件中位于第偶數行的用戶的用戶名;

              sed?-n?'2~2p'?/etc/passwd?|awk?-F:?'{print?$1}'

              13、創建10用戶user10-user19;密碼同用戶名;

              #!/bin/bash
              #
              
              ????for?i?in?{10..19};do
              ????????????if?id?user$i?;then
              ????????????????????echo?"user$i?exists."
              ????????????else
              ????????????????????useradd?user$i
              ????????????????????echo?"user$i"?|?passwd?--stdin?user$i
              ????????????fi
              ????done

              14、在/tmp/創建10個空文件file10-file19; 把file10的屬主和屬組改為user10,依次類推。”

              #!/bin/bash
              #
              ????????????cd?/tmp/
              ????for?i?in?{10..19};do
              ????????????if?[?-e?file$i?]?;then
              ????????????????????echo?"file$i?exists."
              ????????????????????chown?user$i:user$i?file$i
              ????????????else
              
              ????????????????????touch?file$i
              ????????????????????chown?user$i:user$i?file$i
              ????????????fi
              ????done

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